50+大厂技术专家现场分享,GMTC北京站9折购票倒计时,戳此查看最新日程 了解详情
写点什么

昨晚,累计 292 万人紧盯 Flightradar24 网站,航班跟踪的技术原理是什么?

  • 2022 年 8 月 03 日
  • 本文字数:66211 字

    阅读完需:约 217 分钟

昨晚,累计292万人紧盯Flightradar24网站,航班跟踪的技术原理是什么?

北京时间 8 月 3 日零时 18 分,飞行航班信息平台 Flightradar24 发布推文称,佩洛西搭乘的 C-40C 专机(呼号 SPAR19)在台北降落时有 70.8 万人进行实时追踪,SPAR19 创下 Flightradar24 平台实时追踪人数最高纪录。


凌晨 4 时 21 分,Flightradar24 发布推文称,这架呼号为 SPAR19 的飞机从吉隆坡起飞到降落在台北期间,有 292 万用户追踪了至少其中一段飞行航程动态。飞机降落时,有 70.8 万人进行实时追踪。这两项数据都创下 Flightradar24 的最高纪录。

Flightradar 24:实时追踪全球飞行航班


Flightradar 24 是一项全球航班跟踪服务,最初由瑞典航空爱好者创立,可以提供全球数千架飞机的实时信息。


Flightradar 24 可以实时跟踪来自全球 1200 多家航空公司的 180000 多个航班,往返于全球 4000 多个机场。可以在线跟踪当天飞行航班的飞行地图轨迹、飞机型号、出发地、目的地、海拔高度、飞行速度、经纬度、飞机雷达型号等信息。此外,多天以前的飞行航班信息也可以追踪到。


Flightradar24 提供的上述服务可在线使用,适用于 iOS 以及 Android 设备。用户如果想追踪某一航班的信息,可以直接登录 Flightradar24 官网(http://www.flightradar24.com/,输入航班信息或者点击地图中的航班,就可以追踪该航班飞行信息。

航班跟踪的工作原理


Flightradar24 结合了来自多个数据源的数据,包括 ADS-B、MLAT 和雷达数据。ADS-B、MLAT 和雷达数据与航空公司和机场的时刻表和航班状态数据汇总在一起,可以在 Flightradar24 官网(www.flightradar24.com)和应用程序(https://www.flightradar24.com/apps)中实现航班跟踪功能。

ADS-B 系统


Flightradar24 用于接收航班飞行信息的主要技术称为广播式自动相关监视系统。下图很好地解释了 ADS-B 技术。



1、飞机从 GPS 导航源(卫星)获取其位置


2、飞机上的 ADS-B 应答器传输包含位置(以及更多内容)的信号


3、ADS-B 信号由连接到 Flightradar24 的接收器接收


4、接收器向 Flightradar24 发送数据


5、数据显示在 www.flightradar24.com 和 Flightradar24 应用程序中


ADS-B 是一项正在开发中的相对较新的技术,目前,它还很少被空中交通管制 (ATC) 使用。Flightradar 24 估计,大约 70% 的商用客机(欧洲 80%,美国 60%)配备了 ADS-B 应答器。对于通用航空来说,这个数字可能低于 20%。不过,配备 ADS-B 接收器的飞机的比例正在稳步增加, 逐渐成为全球大多数飞机的强制要求。在强制要求的情况下,ADS-B 将取代初级雷达,成为空中交通管制中心使用的主要监视方法。


Flightradar24 在全球拥有一个超过 2 万个 ADS-B 接收器的网络,这些接收器从带有 ADS-B 应答器的飞机接收飞行信息,并将这些信息发送到 Flightradar24 的服务器。由于使用的高频频率(1090 MHz),每个接收器的覆盖范围被限制在所有方向上大约 250-450 公里(150-250 英里),具体取决于位置。飞机飞行距离接收器越远,它必须飞得越高才能被接收器覆盖。因为距离的限制,使得 ADS-B 目前对海洋的覆盖变得非常困难。


在巡航高度(30,000 英尺以上),Flightradar24 覆盖了欧洲和美国的 100%(区域)。在加拿大、墨西哥、加勒比、委内瑞拉、哥伦比亚、厄瓜多尔、秘鲁、巴西、南非、俄罗斯、中东、巴基斯坦、印度、中国、日本、泰国、马来西亚、印度尼西亚、澳大利亚、新西兰,ADS-B 的覆盖和范围也不错。在世界其他地区,ADS-B 的覆盖范围各不相同。Flightradar24 正在不断通过 FR24 接收器在世界各地增加覆盖范围。

MLAT


在一些覆盖多个FR24 接收器的地区,Flightradar24 还使用一种到达时间差 (TDOA) 的方法,借助多点定位(MLAT)计算未配备 ADS-B 的飞机的位置。通过测量从使用老式


ModeS 应答器的飞机接收信号所需的时间,就可以计算出这些飞机的位置。需要 4 个或更多的 fr24 接收器,接收来自同一架飞机的信号,才能使 MLAT 工作。MLAT 的覆盖范围只能在大约 3,000-10,000 英尺以上实现,因为随着高度的增加,四个或更多的接收器接收应答器信号的概率增加。


目前,欧洲和北美的大部分地区都被 3,000-10,000 英尺以上的 MLAT 覆盖。墨西哥、巴西、南非、印度、中国、日本、泰国、马来西亚、印度尼西亚、澳大利亚和新西兰也有一些 MLAT 覆盖。随着 Flightradar24 继续向网络添加新的接收器,更多地区将获得 MLAT 覆盖。

卫星


基于卫星的航班跟踪是 Flightradar24 寻求全球 ADS-B 覆盖的最新举措。配备 ADS-B 接收器的卫星从地面 ADS-B 网络覆盖区域之外的飞机收集数据,并将该数据发送到 Flightradar24 网络。Flightradar24 上可用的基于卫星的 ADS-B 数据来自多个供应商。由于提供数据的卫星数量及其位置是动态的,因此卫星覆盖范围也各不相同。通常,基于卫星的 ADS-B 增加了无法进行地面接收的海洋上空飞行的覆盖范围。只有配备 ADS-B 应答器的飞机才能通过卫星被跟踪。


估计


当一架飞机飞出覆盖范围时,如果航班目的地已知,Flightradar24 会持续估计飞机的位置长达 2 小时。对于没有已知目的地的飞机,位置估计可达 10 分钟。位置是根据许多不同的参数计算出来的,且在大多数情况下相当准确,但对于长途飞行来说,在最坏的情况下,位置可能会偏离约 100 公里(55 英里)。在设置中有一个选项,可以设置多长时间你想看到估计的飞机在地图上。

如何开发一款航班跟踪程序


本教程将帮助大家使用 FlightRadar24(https://cesium.com/blog/2020/08/13/flightradar24/)收集到的雷达数据,构建自己的第一款 Cesium 应用程序,以可视化方式追踪从旧金山到哥本哈根的真实航班。


接下来,你将学习如何:


  • 在 Web 上设置并部署 Cesium 应用

  • 添加全球 3D 建筑物、地形与图像基础层

  • 通过位置列表,准确显示飞机的持续行进情况

前期准备


我们将从 Cesium ion(用于流传输和 3D 内容托管的开放平台)获取全球卫星图像、3D 建筑与地形数据。


如果您还没有 Cesium ion 账户,请点击此处(https://cesium.com/ion/signup)免费注册。


在登录完成后:


转向 Access Tokens(https://cesium.com/ion/tokens)选项卡。


请注意默认令牌(https://cesium.com/ion/signin/tokens)旁的复制按钮,我们会在下一步操作中使用这个令牌。


Cesium ion 是一个用于流传输和 3D 内容托管的开放平台,您可以使用其中提供的全球精选数据创建自己的实际应用。



1、设置 Cesium 应用


这里我们使用开源 JS 引擎 CesiumJS 创建自己的应用,同时使用在线 IDE Glitch 托管应用成果。


使用基础模板创建一个新的 Glitch 项目(https://glitch.com/edit/#!/remix/cesium-template)。


单击左侧面板中的 index.html,查看应用程序代码。


将 your_token_here 替换为我们从令牌页面处获取的访问令牌。


点击上方的 Show,再选择 Next to The Code 运行应用。



到这里,index.html 中的代码会执行三项操作:


导入 CesiumJS 库。通过以下两行加载 JS 和 CSS 文件:


<script src="https://cesium.com/downloads/cesiumjs/releases/1.96/Build/Cesium/Cesium.js"></script><link href="https://cesium.com/downloads/cesiumjs/releases/1.96/Build/Cesium/Widgets/widgets.css" rel="stylesheet">
复制代码


为场景添加一个 HTML 容器:

 <div id="cesiumContainer"></div>.
复制代码


初始化查看器: 


const viewer = new Cesium.Viewer('cesiumContainer');
复制代码


现在我们已经在浏览器中运行起最基础的 CesiumJS 应用程序,其中包含来自 Cesium ion 的全球卫星图像。

配置自动刷新


Glitch 会在每次代码更改时,自动刷新当前页面。您可以单击左上角的项目名称并取消相应勾选框,借此切换为不自动刷新:



使用应用窗口上方的刷新按钮,即可重新运行当前应用:



2、添加全球 3D 建筑物与地形


下面,我们在场景中添加一些全局图层。您的 Cesium ion 账户默认可以访问以下资产:


Cesium World Terrain(https://cesium.com/platform/cesium-ion/content/cesium-world-terrain/)——高分辨率地形,精度可达1米。


Cesium OSM Building(https://cesium.com/platform/cesium-ion/content/cesium-osm-buildings/)——由 OpenStreetMap 提供超过 3.5 亿座建筑物的数据。


Bing Maps Aerial Imagery——分辨率达 15 厘米的全球卫星影像。


到这里,您的应用已经用上 Bing Maps 层了。


1 在 index.html 中,使用以下代码替换掉您的 JS 代码,但请保留之前使用的访问令牌行。


// Keep your `Cesium.Ion.defaultAccessToken = 'your_token_here'` line from before here.const viewer = new Cesium.Viewer('cesiumContainer', {terrainProvider: Cesium.createWorldTerrain() });
复制代码


2 通过单击和拖动来探索场景。手动时按住 CTRL 键可以调整相机角度。


请注意,放大时会加载更多高级细节,请根据实际准确性需求选择可视化比例。


这里我们使用的是 3D Tiles,一种能够将内容流传输至任意设备的开放标准。感兴趣的朋友请点击此处(https://cesium.com/docs/tutorials/ion-intro/)了解如何将自有数据转换为 3D Tiles。


3、可视化各单独样本


FlightRadar24 使用多种方法追踪空中交通,包括雷达信号。为简单起见,这里我们将雷达数据直接复制到应用程序当中。但大家之后也可以扩展相应代码以解析原始数据,甚至在样本从服务器传递至应用程序的过程中,对空中交通进行实时可视化。感兴趣的朋友可以点击此处(https://s3.amazonaws.com/cesiumjs/downloads/FlightRadar24_SFO_to_CPH_SK936.csv)下载航班原始数据。


1 添加以下代码,即可对场景中的单一点位进行可视化,并引导相机前往该点。


2 点击红点以查看附加说明。此描述可用于附加信息,例如每个点位的确切位置或捕捉时间。


// STEP 3 CODE (first point)// This is one of the first radar samples collected for our flight.const dataPoint = { longitude: -122.38985, latitude: 37.61864, height: -27.32 };// Mark this location with a red point.const pointEntity = viewer.entities.add({description: `First data point at (${dataPoint.longitude}, ${dataPoint.latitude})`,position: Cesium.Cartesian3.fromDegrees(dataPoint.longitude, dataPoint.latitude, dataPoint.height),point: { pixelSize: 10, color: Cesium.Color.RED }});// Fly the camera to this point.viewer.flyTo(pointEntity);
复制代码


4、要对完整雷达样本进行可视化,请将以上代码(第 3 步)替换为以下代码片段。


// STEP 3 CODE (all points)// These are all the radar points from this flight.const flightData = JSON.parse(  '[{"longitude":-122.39053,"latitude":37.61779,"height":-27.32},{"longitude":-122.39035,"latitude":37.61803,"height":-27.32},{"longitude":-122.39019,"latitude":37.61826,"height":-27.32},{"longitude":-122.39006,"latitude":37.6185,"height":-27.32},{"longitude":-122.38985,"latitude":37.61864,"height":-27.32},{"longitude":-122.39005,"latitude":37.61874,"height":-27.32},{"longitude":-122.39027,"latitude":37.61884,"height":-27.32},{"longitude":-122.39057,"latitude":37.61898,"height":-27.32},{"longitude":-122.39091,"latitude":37.61912,"height":-27.32},{"longitude":-122.39121,"latitude":37.61926,"height":-27.32},{"longitude":-122.39153,"latitude":37.61937,"height":-27.32},{"longitude":-122.39175,"latitude":37.61948,"height":-27.32},{"longitude":-122.39207,"latitude":37.6196,"height":-27.32},{"longitude":-122.39247,"latitude":37.61983,"height":-27.32},{"longitude":-122.39253,"latitude":37.62005,"height":-27.32},{"longitude":-122.39226,"latitude":37.62048,"height":-27.32},{"longitude":-122.39207,"latitude":37.62075,"height":-27.32},{"longitude":-122.39186,"latitude":37.62106,"height":-27.32},{"longitude":-122.39172,"latitude":37.62127,"height":-27.32},{"longitude":-122.39141,"latitude":37.62174,"height":-27.32},{"longitude":-122.39097,"latitude":37.62227,"height":-27.32},{"longitude":-122.39061,"latitude":37.6224,"height":-27.31},{"longitude":-122.39027,"latitude":37.62249,"height":-27.31},{"longitude":-122.38993,"latitude":37.62256,"height":-27.31},{"longitude":-122.3895,"latitude":37.62267,"height":-27.31},{"longitude":-122.3889,"latitude":37.62256,"height":-27.31},{"longitude":-122.38854,"latitude":37.62242,"height":-27.31},{"longitude":-122.38814,"latitude":37.62225,"height":-27.31},{"longitude":-122.38778,"latitude":37.62209,"height":-27.31},{"longitude":-122.38744,"latitude":37.62195,"height":-27.31},{"longitude":-122.38671,"latitude":37.62164,"height":-27.31},{"longitude":-122.38638,"latitude":37.62151,"height":-27.31},{"longitude":-122.38604,"latitude":37.62136,"height":-27.31},{"longitude":-122.38571,"latitude":37.62123,"height":-27.31},{"longitude":-122.38512,"latitude":37.62098,"height":-27.31},{"longitude":-122.3848,"latitude":37.62084,"height":-27.31},{"longitude":-122.38453,"latitude":37.62074,"height":-27.31},{"longitude":-122.38425,"latitude":37.62062,"height":-27.3},{"longitude":-122.38397,"latitude":37.62049,"height":-27.3},{"longitude":-122.38372,"latitude":37.62039,"height":-27.3},{"longitude":-122.3835,"latitude":37.6203,"height":-27.3},{"longitude":-122.38324,"latitude":37.62019,"height":-27.3},{"longitude":-122.38271,"latitude":37.61996,"height":-27.3},{"longitude":-122.38248,"latitude":37.61986,"height":-27.3},{"longitude":-122.38191,"latitude":37.61962,"height":-27.3},{"longitude":-122.38159,"latitude":37.6195,"height":-27.3},{"longitude":-122.38126,"latitude":37.61935,"height":-27.3},{"longitude":-122.38058,"latitude":37.61906,"height":-27.3},{"longitude":-122.38026,"latitude":37.61894,"height":-27.3},{"longitude":-122.37955,"latitude":37.61863,"height":-27.3},{"longitude":-122.37913,"latitude":37.61847,"height":-27.3},{"longitude":-122.3781,"latitude":37.61813,"height":-27.3},{"longitude":-122.37763,"latitude":37.61799,"height":-27.29},{"longitude":-122.37663,"latitude":37.61768,"height":-27.29},{"longitude":-122.37617,"latitude":37.61753,"height":-27.29},{"longitude":-122.37561,"latitude":37.61736,"height":-27.29},{"longitude":-122.37532,"latitude":37.61727,"height":-27.29},{"longitude":-122.37506,"latitude":37.61718,"height":-27.29},{"longitude":-122.37468,"latitude":37.61704,"height":-27.29},{"longitude":-122.37436,"latitude":37.61689,"height":-27.29},{"longitude":-122.37402,"latitude":37.61674,"height":-27.29},{"longitude":-122.37362,"latitude":37.61657,"height":-27.29},{"longitude":-122.3732,"latitude":37.6164,"height":-27.29},{"longitude":-122.37235,"latitude":37.61604,"height":-27.29},{"longitude":-122.37198,"latitude":37.61588,"height":-27.29},{"longitude":-122.3716,"latitude":37.61573,"height":-27.28},{"longitude":-122.3712,"latitude":37.61555,"height":-27.28},{"longitude":-122.37032,"latitude":37.61518,"height":-27.28},{"longitude":-122.36938,"latitude":37.61476,"height":-27.28},{"longitude":-122.36872,"latitude":37.6143,"height":-27.28},{"longitude":-122.36811,"latitude":37.61387,"height":-27.28},{"longitude":-122.36747,"latitude":37.61352,"height":-27.28},{"longitude":-122.36672,"latitude":37.61321,"height":-27.28},{"longitude":-122.36602,"latitude":37.61292,"height":-27.28},{"longitude":-122.3655,"latitude":37.61269,"height":-27.28},{"longitude":-122.36498,"latitude":37.61247,"height":-27.27},{"longitude":-122.3639,"latitude":37.61203,"height":-27.27},{"longitude":-122.36337,"latitude":37.6118,"height":-27.27},{"longitude":-122.36254,"latitude":37.61146,"height":-27.27},{"longitude":-122.36203,"latitude":37.61124,"height":-27.27},{"longitude":-122.36154,"latitude":37.61103,"height":-27.27},{"longitude":-122.36106,"latitude":37.61082,"height":-27.27},{"longitude":-122.36029,"latitude":37.61052,"height":-27.27},{"longitude":-122.35989,"latitude":37.61048,"height":-27.27},{"longitude":-122.35953,"latitude":37.61055,"height":-27.27},{"longitude":-122.35922,"latitude":37.61074,"height":-27.26},{"longitude":-122.35893,"latitude":37.61117,"height":-27.26},{"longitude":-122.35875,"latitude":37.61144,"height":-27.26},{"longitude":-122.35865,"latitude":37.61171,"height":-27.26},{"longitude":-122.35889,"latitude":37.612,"height":-27.26},{"longitude":-122.35923,"latitude":37.61211,"height":-27.26},{"longitude":-122.35954,"latitude":37.61222,"height":-27.26},{"longitude":-122.36029,"latitude":37.61253,"height":-27.27},{"longitude":-122.36184,"latitude":37.61317,"height":-27.27},{"longitude":-122.36823,"latitude":37.61588,"height":-27.28},{"longitude":-122.37163,"latitude":37.61728,"height":-27.28},{"longitude":-122.38041,"latitude":37.62096,"height":-27.3},{"longitude":-122.38548,"latitude":37.6231,"height":-27.31},{"longitude":-122.3905,"latitude":37.6252,"height":10.79},{"longitude":-122.39517,"latitude":37.62721,"height":56.5},{"longitude":-122.40037,"latitude":37.62955,"height":125.07},{"longitude":-122.40507,"latitude":37.63171,"height":186.03},{"longitude":-122.41457,"latitude":37.63623,"height":292.69},{"longitude":-122.42428,"latitude":37.64062,"height":384.12},{"longitude":-122.42896,"latitude":37.64261,"height":429.83},{"longitude":-122.43398,"latitude":37.6447,"height":483.17},{"longitude":-122.44357,"latitude":37.64859,"height":582.21},{"longitude":-122.45319,"latitude":37.65243,"height":643.16},{"longitude":-122.4639,"latitude":37.65678,"height":719.35},{"longitude":-122.47395,"latitude":37.66081,"height":803.15},{"longitude":-122.47922,"latitude":37.66286,"height":841.25},{"longitude":-122.48441,"latitude":37.66489,"height":879.34},{"longitude":-122.49505,"latitude":37.66933,"height":970.77},{"longitude":-122.5003,"latitude":37.67162,"height":993.62},{"longitude":-122.51083,"latitude":37.67647,"height":1024.08},{"longitude":-122.51626,"latitude":37.67999,"height":1039.31},{"longitude":-122.52048,"latitude":37.68431,"height":1046.93},{"longitude":-122.52323,"latitude":37.68939,"height":1069.79},{"longitude":-122.52456,"latitude":37.69482,"height":1092.65},{"longitude":-122.5255,"latitude":37.70298,"height":1115.52},{"longitude":-122.52602,"latitude":37.70943,"height":1138.38},{"longitude":-122.52634,"latitude":37.71574,"height":1161.25},{"longitude":-122.51643,"latitude":37.73744,"height":1245.12},{"longitude":-122.50723,"latitude":37.74465,"height":1283.25},{"longitude":-122.50024,"latitude":37.74957,"height":1313.75},{"longitude":-122.4864,"latitude":37.75959,"height":1397.6},{"longitude":-122.47231,"latitude":37.77008,"height":1504.31},{"longitude":-122.45805,"latitude":37.78079,"height":1626.25},{"longitude":-122.44339,"latitude":37.79173,"height":1755.82},{"longitude":-122.42878,"latitude":37.80263,"height":1893.01},{"longitude":-122.41031,"latitude":37.81632,"height":2045.44},{"longitude":-122.39535,"latitude":37.82744,"height":2175},{"longitude":-122.3808,"latitude":37.8382,"height":2304.56},{"longitude":-122.36244,"latitude":37.85177,"height":2472.23},{"longitude":-122.34698,"latitude":37.86317,"height":2601.79},{"longitude":-122.33206,"latitude":37.87422,"height":2716.11},{"longitude":-122.31736,"latitude":37.88505,"height":2830.42},{"longitude":-122.29758,"latitude":37.89967,"height":2982.85},{"longitude":-122.28344,"latitude":37.91011,"height":3089.54},{"longitude":-122.2672,"latitude":37.9221,"height":3142.9},{"longitude":-122.25107,"latitude":37.93401,"height":3196.25},{"longitude":-122.235,"latitude":37.94586,"height":3241.98},{"longitude":-122.21102,"latitude":37.96354,"height":3318.19},{"longitude":-122.19532,"latitude":37.97507,"height":3386.77},{"longitude":-122.17095,"latitude":37.99296,"height":3523.94},{"longitude":-122.15459,"latitude":38.00497,"height":3630.63},{"longitude":-122.10188,"latitude":38.04364,"height":3927.88},{"longitude":-122.05068,"latitude":38.08113,"height":4247.98},{"longitude":-121.99834,"latitude":38.11944,"height":4552.84},{"longitude":-121.94544,"latitude":38.15803,"height":4842.46},{"longitude":-121.89173,"latitude":38.19722,"height":5116.83},{"longitude":-121.83744,"latitude":38.23672,"height":5368.34},{"longitude":-121.78076,"latitude":38.27786,"height":5619.88},{"longitude":-121.67054,"latitude":38.35774,"height":6001.09},{"longitude":-121.56262,"latitude":38.4366,"height":6488.97},{"longitude":-121.46884,"latitude":38.52786,"height":6984.57},{"longitude":-121.37305,"latitude":38.62742,"height":7442.27},{"longitude":-121.27969,"latitude":38.72305,"height":7869.52},{"longitude":-121.18384,"latitude":38.82103,"height":8114.16},{"longitude":-121.0849,"latitude":38.92167,"height":8419.92},{"longitude":-120.98819,"latitude":39.01978,"height":8664.74},{"longitude":-120.88629,"latitude":39.12269,"height":8917.28},{"longitude":-120.77951,"latitude":39.23016,"height":9108.83},{"longitude":-120.67163,"latitude":39.33836,"height":9376.26},{"longitude":-120.5672,"latitude":39.44264,"height":9612.99},{"longitude":-120.4577,"latitude":39.55152,"height":9910.45},{"longitude":-120.35071,"latitude":39.65748,"height":10040.03},{"longitude":-120.24274,"latitude":39.76404,"height":10040.03},{"longitude":-120.12367,"latitude":39.86746,"height":10040.02},{"longitude":-119.9956,"latitude":39.97069,"height":10040.05},{"longitude":-119.86682,"latitude":40.07272,"height":10040.2},{"longitude":-119.74329,"latitude":40.17004,"height":10040.38},{"longitude":-119.61475,"latitude":40.27084,"height":10040.57},{"longitude":-119.48225,"latitude":40.37425,"height":10040.77},{"longitude":-119.36212,"latitude":40.46764,"height":10040.95},{"longitude":-119.23717,"latitude":40.56432,"height":10041.15},{"longitude":-119.11108,"latitude":40.66152,"height":10041.4},{"longitude":-118.9834,"latitude":40.75946,"height":10041.66},{"longitude":-118.85547,"latitude":40.85713,"height":10041.97},{"longitude":-118.72528,"latitude":40.95625,"height":10042.26},{"longitude":-118.59631,"latitude":41.05385,"height":10042.52},{"longitude":-118.46595,"latitude":41.15213,"height":10042.76},{"longitude":-118.34192,"latitude":41.24524,"height":10042.98},{"longitude":-118.21114,"latitude":41.34295,"height":10043.29},{"longitude":-118.20084,"latitude":41.35063,"height":10043.32},{"longitude":-118.03749,"latitude":41.47218,"height":10043.8},{"longitude":-118.02363,"latitude":41.48293,"height":10043.85},{"longitude":-118.00575,"latitude":41.49732,"height":10043.91},{"longitude":-117.99279,"latitude":41.50822,"height":10043.95},{"longitude":-117.88224,"latitude":41.62019,"height":10044.46},{"longitude":-117.77487,"latitude":41.73303,"height":10044.97},{"longitude":-117.71091,"latitude":41.79902,"height":10045.22},{"longitude":-117.54896,"latitude":41.96512,"height":10045.77},{"longitude":-117.44167,"latitude":42.07448,"height":10046.02},{"longitude":-117.33009,"latitude":42.18782,"height":10046.24},{"longitude":-117.22356,"latitude":42.29567,"height":10046.47},{"longitude":-117.11202,"latitude":42.40792,"height":10046.72},{"longitude":-117.00414,"latitude":42.51599,"height":10047.01},{"longitude":-116.89089,"latitude":42.62896,"height":10047.23},{"longitude":-116.78223,"latitude":42.73691,"height":10047.44},{"longitude":-116.67059,"latitude":42.84728,"height":10047.47},{"longitude":-116.56448,"latitude":42.95175,"height":10047.46},{"longitude":-116.45987,"latitude":43.05432,"height":10047.4},{"longitude":-116.35005,"latitude":43.16137,"height":10047.34},{"longitude":-116.24506,"latitude":43.26334,"height":10047.36},{"longitude":-116.13922,"latitude":43.36574,"height":10047.47},{"longitude":-116.03102,"latitude":43.46997,"height":10047.65},{"longitude":-115.91975,"latitude":43.58192,"height":10047.9},{"longitude":-115.81421,"latitude":43.69277,"height":10048.15},{"longitude":-115.70801,"latitude":43.80258,"height":10048.42},{"longitude":-115.59547,"latitude":43.91822,"height":10048.71},{"longitude":-115.48815,"latitude":44.02803,"height":10048.97},{"longitude":-115.38025,"latitude":44.13795,"height":10049.29},{"longitude":-115.26595,"latitude":44.25382,"height":10049.57},{"longitude":-115.15695,"latitude":44.36372,"height":10049.78},{"longitude":-115.04876,"latitude":44.47243,"height":10049.92},{"longitude":-114.94008,"latitude":44.5811,"height":10049.96},{"longitude":-114.83057,"latitude":44.68991,"height":10049.93},{"longitude":-114.72199,"latitude":44.79744,"height":10049.89},{"longitude":-114.61474,"latitude":44.90318,"height":10049.86},{"longitude":-114.50775,"latitude":45.0081,"height":10049.83},{"longitude":-114.39586,"latitude":45.11742,"height":10049.89},{"longitude":-114.28724,"latitude":45.22288,"height":10049.95},{"longitude":-114.1452,"latitude":45.36018,"height":10050.06},{"longitude":-114.03063,"latitude":45.47031,"height":10050.15},{"longitude":-113.91023,"latitude":45.56812,"height":10050.28},{"longitude":-113.77957,"latitude":45.67081,"height":10050.45},{"longitude":-113.65418,"latitude":45.76769,"height":10050.63},{"longitude":-113.52166,"latitude":45.86923,"height":10050.8},{"longitude":-113.39298,"latitude":45.9674,"height":10050.95},{"longitude":-113.25732,"latitude":46.07053,"height":10051},{"longitude":-113.12656,"latitude":46.16925,"height":10050.95},{"longitude":-112.99599,"latitude":46.26736,"height":10050.88},{"longitude":-112.85692,"latitude":46.37138,"height":10050.79},{"longitude":-112.72378,"latitude":46.47044,"height":10050.7},{"longitude":-112.59017,"latitude":46.56935,"height":10050.71},{"longitude":-112.45451,"latitude":46.66919,"height":10050.75},{"longitude":-112.40219,"latitude":46.7075,"height":10050.75},{"longitude":-112.18308,"latitude":46.86731,"height":10050.72},{"longitude":-112.04336,"latitude":46.9686,"height":10050.62},{"longitude":-111.91223,"latitude":47.07069,"height":10050.47},{"longitude":-111.78719,"latitude":47.17534,"height":10050.26},{"longitude":-111.65659,"latitude":47.28245,"height":10050.09},{"longitude":-111.52737,"latitude":47.38783,"height":10049.95},{"longitude":-111.39635,"latitude":47.49399,"height":10049.81},{"longitude":-111.26383,"latitude":47.60092,"height":10049.73},{"longitude":-111.13261,"latitude":47.70612,"height":10049.56},{"longitude":-110.9972,"latitude":47.81413,"height":10049.38},{"longitude":-110.86276,"latitude":47.92076,"height":10049.15},{"longitude":-110.72704,"latitude":48.02771,"height":10048.89},{"longitude":-110.59324,"latitude":48.13269,"height":10048.71},{"longitude":-110.45213,"latitude":48.24274,"height":10048.51},{"longitude":-110.29809,"latitude":48.36214,"height":10048.31},{"longitude":-110.15818,"latitude":48.46991,"height":10048.12},{"longitude":-110.01434,"latitude":48.58001,"height":10047.89},{"longitude":-109.87766,"latitude":48.68405,"height":10047.65},{"longitude":-109.73201,"latitude":48.79427,"height":10047.4},{"longitude":-109.59253,"latitude":48.89912,"height":10047.26},{"longitude":-109.4451,"latitude":49.00946,"height":10047.11},{"longitude":-109.29828,"latitude":49.12085,"height":10047.1},{"longitude":-109.15861,"latitude":49.22635,"height":10047.09},{"longitude":-109.00909,"latitude":49.33844,"height":10047.04},{"longitude":-108.86092,"latitude":49.44878,"height":10046.98},{"longitude":-108.71825,"latitude":49.55443,"height":10046.88},{"longitude":-108.56899,"latitude":49.66429,"height":10046.72},{"longitude":-108.42393,"latitude":49.77044,"height":10046.57},{"longitude":-108.27145,"latitude":49.88123,"height":10046.36},{"longitude":-108.1247,"latitude":49.98719,"height":10046.11},{"longitude":-107.97197,"latitude":50.09683,"height":10045.75},{"longitude":-107.82331,"latitude":50.20291,"height":10045.33},{"longitude":-107.68083,"latitude":50.30452,"height":10044.86},{"longitude":-107.47946,"latitude":50.46744,"height":10044.09},{"longitude":-107.34006,"latitude":50.57956,"height":10043.61},{"longitude":-107.20117,"latitude":50.69032,"height":10043.17},{"longitude":-107.06024,"latitude":50.80199,"height":10042.81},{"longitude":-106.91856,"latitude":50.91358,"height":10042.53},{"longitude":-106.7762,"latitude":51.02502,"height":10042.3},{"longitude":-106.63352,"latitude":51.136,"height":10042.14},{"longitude":-106.48335,"latitude":51.25195,"height":10042},{"longitude":-106.33897,"latitude":51.36282,"height":10041.91},{"longitude":-106.19385,"latitude":51.47346,"height":10041.81},{"longitude":-106.05192,"latitude":51.58099,"height":10041.72},{"longitude":-105.89882,"latitude":51.69621,"height":10041.62},{"longitude":-105.75058,"latitude":51.80705,"height":10041.51},{"longitude":-105.60936,"latitude":51.91196,"height":10041.39},{"longitude":-105.45824,"latitude":52.02352,"height":10041.25},{"longitude":-105.30106,"latitude":52.13869,"height":10041.07},{"longitude":-105.14606,"latitude":52.25153,"height":10040.87},{"longitude":-104.99657,"latitude":52.35965,"height":10040.58},{"longitude":-104.83852,"latitude":52.47313,"height":10040.27},{"longitude":-104.68841,"latitude":52.58019,"height":10039.9},{"longitude":-104.5369,"latitude":52.68745,"height":10039.52},{"longitude":-104.38322,"latitude":52.79568,"height":10039.14},{"longitude":-104.36918,"latitude":52.80551,"height":10039.1},{"longitude":-104.14574,"latitude":52.96129,"height":10038.5},{"longitude":-104.08882,"latitude":53.00075,"height":10038.34},{"longitude":-103.66236,"latitude":53.29321,"height":10037.06},{"longitude":-103.50163,"latitude":53.40198,"height":10036.52},{"longitude":-103.34328,"latitude":53.50841,"height":10035.99},{"longitude":-103.18163,"latitude":53.61635,"height":10035.45},{"longitude":-103.01807,"latitude":53.72468,"height":10034.91},{"longitude":-102.85287,"latitude":53.83333,"height":10034.47},{"longitude":-102.6947,"latitude":53.93663,"height":10034.08},{"longitude":-102.67634,"latitude":53.94859,"height":10034.03},{"longitude":-102.48911,"latitude":54.06987,"height":10033.65},{"longitude":-102.2399,"latitude":54.22977,"height":10033.22},{"longitude":-102.07179,"latitude":54.33659,"height":10032.94},{"longitude":-101.89569,"latitude":54.44769,"height":10032.64},{"longitude":-101.70779,"latitude":54.56534,"height":10032.33},{"longitude":-101.63161,"latitude":54.61276,"height":10032.22},{"longitude":-100.99348,"latitude":55.0037,"height":10031.42},{"longitude":-100.81579,"latitude":55.11273,"height":10031.19},{"longitude":-100.63565,"latitude":55.22264,"height":10030.93},{"longitude":-100.44937,"latitude":55.33539,"height":10030.6},{"longitude":-100.2748,"latitude":55.44008,"height":10030.29},{"longitude":-100.0996,"latitude":55.54445,"height":10030},{"longitude":-99.92199,"latitude":55.64932,"height":10029.73},{"longitude":-99.74412,"latitude":55.75351,"height":10029.49},{"longitude":-99.56592,"latitude":55.85728,"height":10029.14},{"longitude":-99.39177,"latitude":55.95775,"height":10028.76},{"longitude":-99.21032,"latitude":56.0617,"height":10028.26},{"longitude":-99.03151,"latitude":56.16321,"height":10027.69},{"longitude":-98.85481,"latitude":56.26291,"height":10027.12},{"longitude":-98.75731,"latitude":56.3175,"height":10026.81},{"longitude":-92.14444,"latitude":59.53107,"height":10623.76},{"longitude":-91.9352,"latitude":59.61856,"height":10623.89},{"longitude":-91.7233,"latitude":59.7063,"height":10624.05},{"longitude":-91.50816,"latitude":59.79458,"height":10624.26},{"longitude":-91.29959,"latitude":59.87933,"height":10624.49},{"longitude":-91.08373,"latitude":59.96636,"height":10624.75},{"longitude":-90.88204,"latitude":60.06123,"height":10624.98},{"longitude":-90.70332,"latitude":60.17049,"height":10625.19},{"longitude":-90.51695,"latitude":60.27779,"height":10625.42},{"longitude":-90.33527,"latitude":60.38063,"height":10625.63},{"longitude":-90.149,"latitude":60.48518,"height":10625.84},{"longitude":-90.02708,"latitude":60.5532,"height":10625.97},{"longitude":-89.74967,"latitude":60.70626,"height":10626.24},{"longitude":-89.617,"latitude":60.77884,"height":10626.34},{"longitude":-87.30364,"latitude":61.97255,"height":10628.64},{"longitude":-59.43304,"latitude":68.13538,"height":10694.36},{"longitude":-59.06637,"latitude":68.17969,"height":10695.72},{"longitude":-58.69851,"latitude":68.22324,"height":10696.85},{"longitude":-58.32642,"latitude":68.26625,"height":10697.56},{"longitude":-57.95463,"latitude":68.30823,"height":10697.89},{"longitude":-57.58284,"latitude":68.34924,"height":10698.01},{"longitude":-57.21012,"latitude":68.38943,"height":10698.12},{"longitude":-56.83685,"latitude":68.42862,"height":10698.38},{"longitude":-56.46272,"latitude":68.46693,"height":10698.76},{"longitude":-56.08337,"latitude":68.50484,"height":10699.18},{"longitude":-55.70435,"latitude":68.54182,"height":10699.41},{"longitude":-55.31946,"latitude":68.57824,"height":10699.27},{"longitude":-54.92968,"latitude":68.61415,"height":10698.75},{"longitude":-54.5568,"latitude":68.64748,"height":10698.01},{"longitude":-54.16822,"latitude":68.6814,"height":10697.2},{"longitude":-53.78302,"latitude":68.71394,"height":10696.55},{"longitude":-53.39172,"latitude":68.7459,"height":10696.21},{"longitude":-52.99648,"latitude":68.77739,"height":10696.22},{"longitude":-52.60954,"latitude":68.80714,"height":10696.5},{"longitude":-52.21953,"latitude":68.83614,"height":10696.91},{"longitude":-51.83844,"latitude":68.86361,"height":10697.44},{"longitude":-51.44309,"latitude":68.89105,"height":10698.12},{"longitude":-51.04564,"latitude":68.91775,"height":10698.95},{"longitude":-50.65205,"latitude":68.94307,"height":10699.93},{"longitude":-50.26114,"latitude":68.96736,"height":10700.99},{"longitude":-49.862,"latitude":68.9873,"height":10702.1},{"longitude":-49.45413,"latitude":68.99833,"height":10703.2},{"longitude":-49.04689,"latitude":69.00851,"height":10704.25},{"longitude":-48.65419,"latitude":69.01737,"height":10705.2},{"longitude":-48.29727,"latitude":69.02459,"height":10706.04},{"longitude":-29.1449,"latitude":67.84658,"height":11341.65},{"longitude":-28.98855,"latitude":67.82117,"height":11341.68},{"longitude":-28.52525,"latitude":67.74468,"height":11341.68},{"longitude":-28.04757,"latitude":67.66386,"height":11341.81},{"longitude":-27.71401,"latitude":67.60634,"height":11342.03},{"longitude":-27.37356,"latitude":67.54655,"height":11342.31},{"longitude":-27.0469,"latitude":67.48827,"height":11342.56},{"longitude":-26.72125,"latitude":67.42923,"height":11342.67},{"longitude":-26.39715,"latitude":67.36942,"height":11342.64},{"longitude":-26.07518,"latitude":67.30913,"height":11342.52},{"longitude":-25.7552,"latitude":67.24829,"height":11342.39},{"longitude":-25.49839,"latitude":67.19872,"height":11342.44},{"longitude":-25.02888,"latitude":67.10655,"height":11342.85},{"longitude":-24.71243,"latitude":67.04324,"height":11343.37},{"longitude":-24.39717,"latitude":66.97925,"height":11343.99},{"longitude":-24.08335,"latitude":66.91452,"height":11344.62},{"longitude":-23.77346,"latitude":66.84965,"height":11345.14},{"longitude":-23.46293,"latitude":66.78374,"height":11345.54},{"longitude":-23.15693,"latitude":66.71787,"height":11345.83},{"longitude":-22.84894,"latitude":66.65057,"height":11346.07},{"longitude":-22.54657,"latitude":66.58357,"height":11346.3},{"longitude":-22.24051,"latitude":66.51475,"height":11346.53},{"longitude":-21.94095,"latitude":66.44648,"height":11346.77},{"longitude":-21.64486,"latitude":66.37798,"height":11347},{"longitude":-21.34827,"latitude":66.30853,"height":11347.2},{"longitude":-21.05129,"latitude":66.23799,"height":11347.38},{"longitude":-20.76073,"latitude":66.168,"height":11347.56},{"longitude":-20.46514,"latitude":66.09585,"height":11347.79},{"longitude":-20.17269,"latitude":66.02355,"height":11348.04},{"longitude":-19.8698,"latitude":65.9599,"height":11348.29},{"longitude":-19.54587,"latitude":65.91103,"height":11348.51},{"longitude":-19.22667,"latitude":65.86047,"height":11348.73},{"longitude":-18.90771,"latitude":65.8089,"height":11348.91},{"longitude":-18.5854,"latitude":65.75574,"height":11349.05},{"longitude":-18.26923,"latitude":65.70277,"height":11349.11},{"longitude":-17.94079,"latitude":65.64685,"height":11349.12},{"longitude":-17.62601,"latitude":65.59234,"height":11349.1},{"longitude":-17.31125,"latitude":65.53702,"height":11349.04},{"longitude":-16.99459,"latitude":65.48039,"height":11348.95},{"longitude":-16.68549,"latitude":65.42427,"height":11348.86},{"longitude":-16.37524,"latitude":65.36705,"height":11348.81},{"longitude":-16.07058,"latitude":65.31001,"height":11348.81},{"longitude":-15.76197,"latitude":65.25128,"height":11348.82},{"longitude":-15.45353,"latitude":65.19176,"height":11348.76},{"longitude":-15.1474,"latitude":65.1318,"height":11348.59},{"longitude":-14.84413,"latitude":65.07147,"height":11348.29},{"longitude":-14.5448,"latitude":65.01105,"height":11347.88},{"longitude":-14.23416,"latitude":64.9474,"height":11347.31},{"longitude":-13.92803,"latitude":64.88374,"height":11346.75},{"longitude":-13.63037,"latitude":64.82101,"height":11346.29},{"longitude":-13.33048,"latitude":64.75685,"height":11345.94},{"longitude":-13.03505,"latitude":64.69281,"height":11345.71},{"longitude":-12.74288,"latitude":64.62856,"height":11345.56},{"longitude":-12.4541,"latitude":64.56418,"height":11345.46},{"longitude":-12.16604,"latitude":64.49899,"height":11345.34},{"longitude":-11.86913,"latitude":64.43105,"height":11345.14},{"longitude":-11.61442,"latitude":64.37192,"height":11344.91},{"longitude":-10.65684,"latitude":64.14345,"height":11343.62},{"longitude":-10.36856,"latitude":64.07259,"height":11343.14},{"longitude":-10.08732,"latitude":64.00272,"height":11342.68},{"longitude":-9.80299,"latitude":63.93689,"height":11342.26},{"longitude":-9.51532,"latitude":63.87328,"height":11341.9},{"longitude":-9.2317,"latitude":63.80892,"height":11341.63},{"longitude":-8.94171,"latitude":63.74226,"height":11341.42},{"longitude":-8.68986,"latitude":63.68351,"height":11341.25},{"longitude":-8.68986,"latitude":63.68351,"height":11341.25},{"longitude":-8.68986,"latitude":63.68351,"height":11341.25},{"longitude":-7.92336,"latitude":63.50079,"height":11340.42},{"longitude":-7.64275,"latitude":63.43227,"height":11339.93},{"longitude":-7.3626,"latitude":63.36295,"height":11339.44},{"longitude":-7.07893,"latitude":63.29186,"height":11338.96},{"longitude":-6.79746,"latitude":63.22041,"height":11338.59},{"longitude":-6.51996,"latitude":63.14909,"height":11338.35},{"longitude":-6.2396,"latitude":63.07619,"height":11338.19},{"longitude":-5.96405,"latitude":63.00343,"height":11338.03},{"longitude":-5.68573,"latitude":62.92918,"height":11337.78},{"longitude":-5.41433,"latitude":62.8559,"height":11337.48},{"longitude":-5.14192,"latitude":62.78137,"height":11337.16},{"longitude":-4.87172,"latitude":62.70662,"height":11336.81},{"longitude":-4.59666,"latitude":62.62958,"height":11336.46},{"longitude":-4.32555,"latitude":62.55266,"height":11336.15},{"longitude":-4.05406,"latitude":62.47478,"height":11335.77},{"longitude":-3.78426,"latitude":62.39643,"height":11335.2},{"longitude":-3.51362,"latitude":62.31692,"height":11334.51},{"longitude":-3.23642,"latitude":62.23443,"height":11333.7},{"longitude":-2.95807,"latitude":62.15054,"height":11332.93},{"longitude":-2.68351,"latitude":62.0668,"height":11332.33},{"longitude":-2.40287,"latitude":61.98033,"height":11331.99},{"longitude":-2.12929,"latitude":61.89487,"height":11332.02},{"longitude":-1.85286,"latitude":61.80753,"height":11332.24},{"longitude":-1.58244,"latitude":61.72105,"height":11332.59},{"longitude":-1.29796,"latitude":61.629,"height":11332.95},{"longitude":-0.99897,"latitude":61.53575,"height":11333.24},{"longitude":-0.72598,"latitude":61.44937,"height":11333.32},{"longitude":-0.4629,"latitude":61.36505,"height":11333.18},{"longitude":-0.20344,"latitude":61.28091,"height":11332.86},{"longitude":0.06082,"latitude":61.19394,"height":11332.32},{"longitude":0.30075,"latitude":61.10381,"height":11331.7},{"longitude":0.55559,"latitude":61.00829,"height":11331.04},{"longitude":0.80816,"latitude":60.91292,"height":11330.49},{"longitude":1.05645,"latitude":60.81812,"height":11330.09},{"longitude":1.20163,"latitude":60.76212,"height":11329.93},{"longitude":1.55545,"latitude":60.62428,"height":11329.72},{"longitude":1.7891,"latitude":60.53211,"height":11329.61},{"longitude":2.11271,"latitude":60.40288,"height":11329.37},{"longitude":2.34208,"latitude":60.31018,"height":11329.1},{"longitude":2.58365,"latitude":60.2115,"height":11328.73},{"longitude":2.82178,"latitude":60.11334,"height":11328.3},{"longitude":3.05901,"latitude":60.01431,"height":11327.89},{"longitude":3.30066,"latitude":59.91238,"height":11327.52},{"longitude":3.54318,"latitude":59.80911,"height":11327.27},{"longitude":3.81699,"latitude":59.69128,"height":11327.18},{"longitude":4.04382,"latitude":59.59264,"height":11327.21},{"longitude":4.26781,"latitude":59.49413,"height":11327.28},{"longitude":4.48981,"latitude":59.39563,"height":11327.33},{"longitude":4.71266,"latitude":59.29577,"height":11327.27},{"longitude":4.9339,"latitude":59.19569,"height":11327.12},{"longitude":5.15121,"latitude":59.09647,"height":11326.93},{"longitude":5.369,"latitude":58.99593,"height":11326.76},{"longitude":5.58712,"latitude":58.89445,"height":11326.64},{"longitude":5.80106,"latitude":58.79399,"height":11326.63},{"longitude":6.01209,"latitude":58.69382,"height":11326.61},{"longitude":6.22302,"latitude":58.59279,"height":11326.54},{"longitude":6.43561,"latitude":58.49014,"height":11326.41},{"longitude":6.64318,"latitude":58.38904,"height":11326.06},{"longitude":6.85901,"latitude":58.28279,"height":11325.58},{"longitude":7.06518,"latitude":58.18048,"height":11325.08},{"longitude":7.33904,"latitude":58.04292,"height":11324.34},{"longitude":7.54349,"latitude":57.93929,"height":11323.87},{"longitude":7.75497,"latitude":57.83101,"height":11323.44},{"longitude":7.96483,"latitude":57.72258,"height":11323.05},{"longitude":8.21414,"latitude":57.59252,"height":11322.7},{"longitude":8.41748,"latitude":57.48535,"height":11322.44},{"longitude":8.61745,"latitude":57.3788,"height":11322.24},{"longitude":8.82158,"latitude":57.26926,"height":11322.04},{"longitude":8.97506,"latitude":57.19446,"height":11321.91},{"longitude":9.00507,"latitude":57.18388,"height":11321.88},{"longitude":9.26585,"latitude":57.09398,"height":10613},{"longitude":9.50849,"latitude":57.00964,"height":9820.32},{"longitude":9.78744,"latitude":56.91142,"height":9141.98},{"longitude":10.01519,"latitude":56.83041,"height":8555.11},{"longitude":10.23368,"latitude":56.75202,"height":8044.42},{"longitude":10.44206,"latitude":56.67646,"height":7510.89},{"longitude":10.6392,"latitude":56.6044,"height":6977.33},{"longitude":10.83072,"latitude":56.53383,"height":6359.92},{"longitude":11.00705,"latitude":56.4684,"height":5826.32},{"longitude":11.18348,"latitude":56.4025,"height":5368.92},{"longitude":11.27506,"latitude":56.36806,"height":5224.04},{"longitude":11.35806,"latitude":56.33677,"height":5223.95},{"longitude":11.43522,"latitude":56.30759,"height":5223.86},{"longitude":11.51525,"latitude":56.27714,"height":5200.91},{"longitude":11.6019,"latitude":56.2441,"height":4804.58},{"longitude":11.69271,"latitude":56.20927,"height":4347.29},{"longitude":11.77829,"latitude":56.17645,"height":4034.79},{"longitude":11.86415,"latitude":56.14343,"height":3806.12},{"longitude":11.94858,"latitude":56.11081,"height":3524.1},{"longitude":11.9781,"latitude":56.0994,"height":3394.53},{"longitude":12.00814,"latitude":56.08772,"height":3295.44},{"longitude":12.03852,"latitude":56.07591,"height":3196.35},{"longitude":12.06931,"latitude":56.06392,"height":3142.99},{"longitude":12.09844,"latitude":56.05261,"height":3120.1},{"longitude":12.12674,"latitude":56.04163,"height":3097.22},{"longitude":12.15362,"latitude":56.03114,"height":3074.33},{"longitude":12.18075,"latitude":56.02059,"height":3051.45},{"longitude":12.20744,"latitude":56.01016,"height":3028.56},{"longitude":12.23328,"latitude":56.00001,"height":2998.06},{"longitude":12.25825,"latitude":55.99019,"height":2944.7},{"longitude":12.28366,"latitude":55.98023,"height":2868.48},{"longitude":12.30761,"latitude":55.97082,"height":2746.55},{"longitude":12.33224,"latitude":55.96115,"height":2616.99},{"longitude":12.35754,"latitude":55.95117,"height":2472.19},{"longitude":12.38201,"latitude":55.94156,"height":2335.01},{"longitude":12.41163,"latitude":55.9299,"height":2190.21},{"longitude":12.43567,"latitude":55.92041,"height":2053.03},{"longitude":12.46058,"latitude":55.91052,"height":1938.7},{"longitude":12.48321,"latitude":55.90156,"height":1824.38},{"longitude":12.50836,"latitude":55.89155,"height":1694.82},{"longitude":12.53124,"latitude":55.88246,"height":1595.74},{"longitude":12.5542,"latitude":55.87334,"height":1504.28},{"longitude":12.56703,"latitude":55.86827,"height":1458.55},{"longitude":12.58939,"latitude":55.85938,"height":1351.85},{"longitude":12.60165,"latitude":55.85454,"height":1306.12},{"longitude":12.62398,"latitude":55.84569,"height":1214.66},{"longitude":12.63316,"latitude":55.84206,"height":1176.55},{"longitude":12.64551,"latitude":55.83714,"height":1130.81},{"longitude":12.66682,"latitude":55.82863,"height":1062.21},{"longitude":12.68605,"latitude":55.82094,"height":1016.47},{"longitude":12.70785,"latitude":55.81224,"height":955.49},{"longitude":12.72658,"latitude":55.80473,"height":924.99},{"longitude":12.73615,"latitude":55.80093,"height":902.12},{"longitude":12.74526,"latitude":55.79728,"height":871.63},{"longitude":12.76362,"latitude":55.78995,"height":841.13},{"longitude":12.77244,"latitude":55.78638,"height":818.26},{"longitude":12.78259,"latitude":55.78234,"height":795.39},{"longitude":12.80016,"latitude":55.7753,"height":734.41},{"longitude":12.80954,"latitude":55.77102,"height":703.92},{"longitude":12.81495,"latitude":55.7673,"height":673.43},{"longitude":12.82013,"latitude":55.76074,"height":642.94},{"longitude":12.81747,"latitude":55.7384,"height":612.43},{"longitude":12.8148,"latitude":55.73186,"height":597.19},{"longitude":12.81186,"latitude":55.72503,"height":597.18},{"longitude":12.80388,"latitude":55.71316,"height":597.17},{"longitude":12.78018,"latitude":55.69752,"height":581.93},{"longitude":12.77219,"latitude":55.69258,"height":536.21},{"longitude":12.7571,"latitude":55.68304,"height":475.24},{"longitude":12.75097,"latitude":55.67903,"height":429.52},{"longitude":12.727,"latitude":55.66365,"height":307.61},{"longitude":12.6853,"latitude":55.63683,"height":86.64},{"longitude":12.64044,"latitude":55.60784,"height":40.93},{"longitude":12.63927,"latitude":55.60707,"height":40.93},{"longitude":12.63853,"latitude":55.60685,"height":40.93},{"longitude":12.63777,"latitude":55.60692,"height":40.93},{"longitude":12.63715,"latitude":55.60722,"height":40.93},{"longitude":12.63595,"latitude":55.6083,"height":40.94},{"longitude":12.6364,"latitude":55.60869,"height":40.94},{"longitude":12.63698,"latitude":55.60918,"height":40.94},{"longitude":12.63788,"latitude":55.60994,"height":40.94},{"longitude":12.63842,"latitude":55.61042,"height":40.94},{"longitude":12.63904,"latitude":55.61097,"height":40.93},{"longitude":12.64046,"latitude":55.6122,"height":40.93},{"longitude":12.64114,"latitude":55.61282,"height":40.93},{"longitude":12.64187,"latitude":55.61343,"height":40.93},{"longitude":12.64267,"latitude":55.61413,"height":40.93},{"longitude":12.64345,"latitude":55.61482,"height":40.93},{"longitude":12.64487,"latitude":55.61603,"height":40.93},{"longitude":12.64535,"latitude":55.61645,"height":40.93},{"longitude":12.64568,"latitude":55.61689,"height":40.93},{"longitude":12.64554,"latitude":55.61756,"height":40.93},{"longitude":12.64539,"latitude":55.61799,"height":40.93},{"longitude":12.6452,"latitude":55.61862,"height":40.93},{"longitude":12.64503,"latitude":55.61921,"height":40.94},{"longitude":12.64507,"latitude":55.61959,"height":40.94},{"longitude":12.64531,"latitude":55.61997,"height":40.94},{"longitude":12.6457,"latitude":55.62033,"height":40.94},{"longitude":12.64616,"latitude":55.62074,"height":40.94},{"longitude":12.64662,"latitude":55.62112,"height":40.94},{"longitude":12.64732,"latitude":55.62171,"height":40.93},{"longitude":12.64784,"latitude":55.62218,"height":40.93},{"longitude":12.64791,"latitude":55.62269,"height":40.94},{"longitude":12.64786,"latitude":55.62305,"height":40.94},{"longitude":12.64782,"latitude":55.62333,"height":40.94},{"longitude":12.6478,"latitude":55.62367,"height":40.94},{"longitude":12.64776,"latitude":55.62396,"height":40.94},{"longitude":12.64774,"latitude":55.62442,"height":40.94},{"longitude":12.64774,"latitude":55.62472,"height":40.94},{"longitude":12.64788,"latitude":55.62494,"height":40.94},{"longitude":12.6483,"latitude":55.62496,"height":40.94},{"longitude":12.64852,"latitude":55.62494,"height":40.94},{"longitude":12.64878,"latitude":55.62493,"height":40.94},{"longitude":12.64904,"latitude":55.62492,"height":40.94},{"longitude":12.64928,"latitude":55.62491,"height":40.94},{"longitude":12.64936,"latitude":55.6249,"height":40.94},{"longitude":12.64949,"latitude":55.62442,"height":40.94},{"longitude":12.64936,"latitude":55.6247,"height":40.94}]');// Create a point for each.for (let i = 0; i < flightData.length; i++) {  const dataPoint = flightData[i];  viewer.entities.add({    description: `Location: (${dataPoint.longitude}, ${dataPoint.latitude}, ${dataPoint.height})`,    position: Cesium.Cartesian3.fromDegrees(dataPoint.longitude, dataPoint.latitude, dataPoint.height),    point: { pixelSize: 10, color: Cesium.Color.RED }  });}
复制代码


现在,我们已经可以看到航班的完整雷达样本了,从登机口、跑道、一直到降落在哥本哈根机场的全过程。



我们使用的是什么坐标系?


CesiumJS 中的坐标,使用的是 ECEF 格式的 Cartesian3 类。在这套系统中,原点(0,0,0)代表地球的地心。


因此,我们才使用 Cartesian3.fromDegrees 将经度、纬度和高度转换为 ECEF 中的 X、Y 和 Z。


CesiumJS 的高度单位为米,与 WGS84 保持一致。我们对雷达数据进行了预处理,借此将相对平均海平面高度的英尺转换为米。


5、随时间推移实现航班轨迹可视化


到这里,我们已经完成了对雷达样本的可视化。CesiumJS 内置支持,允许向持续收集到的样本间插值,因此可以看到飞机在任意给定时刻的所处位置。


我们还将创建一个 SampledPositionProperty ,用于存储各位置及时间戳。源数据不并不包含各样本的时间戳,但由于我们明确知道追踪的航班编号为 SK936,计划于太平洋标准时间 2020 年 3 月 9 日下午 4:10 起飞。这里,我们假设位置样本的采集间隔为 30 秒。


1 在 index.html 中将所有 JS 代码替换为以下代码,只保留开头确定的访问令牌行。


2 航班动画:


  • 使用左下角的按钮播放/暂停动画。

  • 单击并拖动询问时间轴,即可切换场景时间。

  • 双击地面上的任意位置,即可解除相机与移动实体的绑定。


// STEP 4 CODE (replaces steps 2 and 3)// Keep your `Cesium.Ion.defaultAccessToken = 'your_token_here'` line from before here. const viewer = new Cesium.Viewer('cesiumContainer', {  terrainProvider: Cesium.createWorldTerrain()});const osmBuildings = viewer.scene.primitives.add(Cesium.createOsmBuildings());const flightData = JSON.parse(  '[{"longitude":-122.39053,"latitude":37.61779,"height":-27.32},{"longitude":-122.39035,"latitude":37.61803,"height":-27.32},{"longitude":-122.39019,"latitude":37.61826,"height":-27.32},{"longitude":-122.39006,"latitude":37.6185,"height":-27.32},{"longitude":-122.38985,"latitude":37.61864,"height":-27.32},{"longitude":-122.39005,"latitude":37.61874,"height":-27.32},{"longitude":-122.39027,"latitude":37.61884,"height":-27.32},{"longitude":-122.39057,"latitude":37.61898,"height":-27.32},{"longitude":-122.39091,"latitude":37.61912,"height":-27.32},{"longitude":-122.39121,"latitude":37.61926,"height":-27.32},{"longitude":-122.39153,"latitude":37.61937,"height":-27.32},{"longitude":-122.39175,"latitude":37.61948,"height":-27.32},{"longitude":-122.39207,"latitude":37.6196,"height":-27.32},{"longitude":-122.39247,"latitude":37.61983,"height":-27.32},{"longitude":-122.39253,"latitude":37.62005,"height":-27.32},{"longitude":-122.39226,"latitude":37.62048,"height":-27.32},{"longitude":-122.39207,"latitude":37.62075,"height":-27.32},{"longitude":-122.39186,"latitude":37.62106,"height":-27.32},{"longitude":-122.39172,"latitude":37.62127,"height":-27.32},{"longitude":-122.39141,"latitude":37.62174,"height":-27.32},{"longitude":-122.39097,"latitude":37.62227,"height":-27.32},{"longitude":-122.39061,"latitude":37.6224,"height":-27.31},{"longitude":-122.39027,"latitude":37.62249,"height":-27.31},{"longitude":-122.38993,"latitude":37.62256,"height":-27.31},{"longitude":-122.3895,"latitude":37.62267,"height":-27.31},{"longitude":-122.3889,"latitude":37.62256,"height":-27.31},{"longitude":-122.38854,"latitude":37.62242,"height":-27.31},{"longitude":-122.38814,"latitude":37.62225,"height":-27.31},{"longitude":-122.38778,"latitude":37.62209,"height":-27.31},{"longitude":-122.38744,"latitude":37.62195,"height":-27.31},{"longitude":-122.38671,"latitude":37.62164,"height":-27.31},{"longitude":-122.38638,"latitude":37.62151,"height":-27.31},{"longitude":-122.38604,"latitude":37.62136,"height":-27.31},{"longitude":-122.38571,"latitude":37.62123,"height":-27.31},{"longitude":-122.38512,"latitude":37.62098,"height":-27.31},{"longitude":-122.3848,"latitude":37.62084,"height":-27.31},{"longitude":-122.38453,"latitude":37.62074,"height":-27.31},{"longitude":-122.38425,"latitude":37.62062,"height":-27.3},{"longitude":-122.38397,"latitude":37.62049,"height":-27.3},{"longitude":-122.38372,"latitude":37.62039,"height":-27.3},{"longitude":-122.3835,"latitude":37.6203,"height":-27.3},{"longitude":-122.38324,"latitude":37.62019,"height":-27.3},{"longitude":-122.38271,"latitude":37.61996,"height":-27.3},{"longitude":-122.38248,"latitude":37.61986,"height":-27.3},{"longitude":-122.38191,"latitude":37.61962,"height":-27.3},{"longitude":-122.38159,"latitude":37.6195,"height":-27.3},{"longitude":-122.38126,"latitude":37.61935,"height":-27.3},{"longitude":-122.38058,"latitude":37.61906,"height":-27.3},{"longitude":-122.38026,"latitude":37.61894,"height":-27.3},{"longitude":-122.37955,"latitude":37.61863,"height":-27.3},{"longitude":-122.37913,"latitude":37.61847,"height":-27.3},{"longitude":-122.3781,"latitude":37.61813,"height":-27.3},{"longitude":-122.37763,"latitude":37.61799,"height":-27.29},{"longitude":-122.37663,"latitude":37.61768,"height":-27.29},{"longitude":-122.37617,"latitude":37.61753,"height":-27.29},{"longitude":-122.37561,"latitude":37.61736,"height":-27.29},{"longitude":-122.37532,"latitude":37.61727,"height":-27.29},{"longitude":-122.37506,"latitude":37.61718,"height":-27.29},{"longitude":-122.37468,"latitude":37.61704,"height":-27.29},{"longitude":-122.37436,"latitude":37.61689,"height":-27.29},{"longitude":-122.37402,"latitude":37.61674,"height":-27.29},{"longitude":-122.37362,"latitude":37.61657,"height":-27.29},{"longitude":-122.3732,"latitude":37.6164,"height":-27.29},{"longitude":-122.37235,"latitude":37.61604,"height":-27.29},{"longitude":-122.37198,"latitude":37.61588,"height":-27.29},{"longitude":-122.3716,"latitude":37.61573,"height":-27.28},{"longitude":-122.3712,"latitude":37.61555,"height":-27.28},{"longitude":-122.37032,"latitude":37.61518,"height":-27.28},{"longitude":-122.36938,"latitude":37.61476,"height":-27.28},{"longitude":-122.36872,"latitude":37.6143,"height":-27.28},{"longitude":-122.36811,"latitude":37.61387,"height":-27.28},{"longitude":-122.36747,"latitude":37.61352,"height":-27.28},{"longitude":-122.36672,"latitude":37.61321,"height":-27.28},{"longitude":-122.36602,"latitude":37.61292,"height":-27.28},{"longitude":-122.3655,"latitude":37.61269,"height":-27.28},{"longitude":-122.36498,"latitude":37.61247,"height":-27.27},{"longitude":-122.3639,"latitude":37.61203,"height":-27.27},{"longitude":-122.36337,"latitude":37.6118,"height":-27.27},{"longitude":-122.36254,"latitude":37.61146,"height":-27.27},{"longitude":-122.36203,"latitude":37.61124,"height":-27.27},{"longitude":-122.36154,"latitude":37.61103,"height":-27.27},{"longitude":-122.36106,"latitude":37.61082,"height":-27.27},{"longitude":-122.36029,"latitude":37.61052,"height":-27.27},{"longitude":-122.35989,"latitude":37.61048,"height":-27.27},{"longitude":-122.35953,"latitude":37.61055,"height":-27.27},{"longitude":-122.35922,"latitude":37.61074,"height":-27.26},{"longitude":-122.35893,"latitude":37.61117,"height":-27.26},{"longitude":-122.35875,"latitude":37.61144,"height":-27.26},{"longitude":-122.35865,"latitude":37.61171,"height":-27.26},{"longitude":-122.35889,"latitude":37.612,"height":-27.26},{"longitude":-122.35923,"latitude":37.61211,"height":-27.26},{"longitude":-122.35954,"latitude":37.61222,"height":-27.26},{"longitude":-122.36029,"latitude":37.61253,"height":-27.27},{"longitude":-122.36184,"latitude":37.61317,"height":-27.27},{"longitude":-122.36823,"latitude":37.61588,"height":-27.28},{"longitude":-122.37163,"latitude":37.61728,"height":-27.28},{"longitude":-122.38041,"latitude":37.62096,"height":-27.3},{"longitude":-122.38548,"latitude":37.6231,"height":-27.31},{"longitude":-122.3905,"latitude":37.6252,"height":10.79},{"longitude":-122.39517,"latitude":37.62721,"height":56.5},{"longitude":-122.40037,"latitude":37.62955,"height":125.07},{"longitude":-122.40507,"latitude":37.63171,"height":186.03},{"longitude":-122.41457,"latitude":37.63623,"height":292.69},{"longitude":-122.42428,"latitude":37.64062,"height":384.12},{"longitude":-122.42896,"latitude":37.64261,"height":429.83},{"longitude":-122.43398,"latitude":37.6447,"height":483.17},{"longitude":-122.44357,"latitude":37.64859,"height":582.21},{"longitude":-122.45319,"latitude":37.65243,"height":643.16},{"longitude":-122.4639,"latitude":37.65678,"height":719.35},{"longitude":-122.47395,"latitude":37.66081,"height":803.15},{"longitude":-122.47922,"latitude":37.66286,"height":841.25},{"longitude":-122.48441,"latitude":37.66489,"height":879.34},{"longitude":-122.49505,"latitude":37.66933,"height":970.77},{"longitude":-122.5003,"latitude":37.67162,"height":993.62},{"longitude":-122.51083,"latitude":37.67647,"height":1024.08},{"longitude":-122.51626,"latitude":37.67999,"height":1039.31},{"longitude":-122.52048,"latitude":37.68431,"height":1046.93},{"longitude":-122.52323,"latitude":37.68939,"height":1069.79},{"longitude":-122.52456,"latitude":37.69482,"height":1092.65},{"longitude":-122.5255,"latitude":37.70298,"height":1115.52},{"longitude":-122.52602,"latitude":37.70943,"height":1138.38},{"longitude":-122.52634,"latitude":37.71574,"height":1161.25},{"longitude":-122.51643,"latitude":37.73744,"height":1245.12},{"longitude":-122.50723,"latitude":37.74465,"height":1283.25},{"longitude":-122.50024,"latitude":37.74957,"height":1313.75},{"longitude":-122.4864,"latitude":37.75959,"height":1397.6},{"longitude":-122.47231,"latitude":37.77008,"height":1504.31},{"longitude":-122.45805,"latitude":37.78079,"height":1626.25},{"longitude":-122.44339,"latitude":37.79173,"height":1755.82},{"longitude":-122.42878,"latitude":37.80263,"height":1893.01},{"longitude":-122.41031,"latitude":37.81632,"height":2045.44},{"longitude":-122.39535,"latitude":37.82744,"height":2175},{"longitude":-122.3808,"latitude":37.8382,"height":2304.56},{"longitude":-122.36244,"latitude":37.85177,"height":2472.23},{"longitude":-122.34698,"latitude":37.86317,"height":2601.79},{"longitude":-122.33206,"latitude":37.87422,"height":2716.11},{"longitude":-122.31736,"latitude":37.88505,"height":2830.42},{"longitude":-122.29758,"latitude":37.89967,"height":2982.85},{"longitude":-122.28344,"latitude":37.91011,"height":3089.54},{"longitude":-122.2672,"latitude":37.9221,"height":3142.9},{"longitude":-122.25107,"latitude":37.93401,"height":3196.25},{"longitude":-122.235,"latitude":37.94586,"height":3241.98},{"longitude":-122.21102,"latitude":37.96354,"height":3318.19},{"longitude":-122.19532,"latitude":37.97507,"height":3386.77},{"longitude":-122.17095,"latitude":37.99296,"height":3523.94},{"longitude":-122.15459,"latitude":38.00497,"height":3630.63},{"longitude":-122.10188,"latitude":38.04364,"height":3927.88},{"longitude":-122.05068,"latitude":38.08113,"height":4247.98},{"longitude":-121.99834,"latitude":38.11944,"height":4552.84},{"longitude":-121.94544,"latitude":38.15803,"height":4842.46},{"longitude":-121.89173,"latitude":38.19722,"height":5116.83},{"longitude":-121.83744,"latitude":38.23672,"height":5368.34},{"longitude":-121.78076,"latitude":38.27786,"height":5619.88},{"longitude":-121.67054,"latitude":38.35774,"height":6001.09},{"longitude":-121.56262,"latitude":38.4366,"height":6488.97},{"longitude":-121.46884,"latitude":38.52786,"height":6984.57},{"longitude":-121.37305,"latitude":38.62742,"height":7442.27},{"longitude":-121.27969,"latitude":38.72305,"height":7869.52},{"longitude":-121.18384,"latitude":38.82103,"height":8114.16},{"longitude":-121.0849,"latitude":38.92167,"height":8419.92},{"longitude":-120.98819,"latitude":39.01978,"height":8664.74},{"longitude":-120.88629,"latitude":39.12269,"height":8917.28},{"longitude":-120.77951,"latitude":39.23016,"height":9108.83},{"longitude":-120.67163,"latitude":39.33836,"height":9376.26},{"longitude":-120.5672,"latitude":39.44264,"height":9612.99},{"longitude":-120.4577,"latitude":39.55152,"height":9910.45},{"longitude":-120.35071,"latitude":39.65748,"height":10040.03},{"longitude":-120.24274,"latitude":39.76404,"height":10040.03},{"longitude":-120.12367,"latitude":39.86746,"height":10040.02},{"longitude":-119.9956,"latitude":39.97069,"height":10040.05},{"longitude":-119.86682,"latitude":40.07272,"height":10040.2},{"longitude":-119.74329,"latitude":40.17004,"height":10040.38},{"longitude":-119.61475,"latitude":40.27084,"height":10040.57},{"longitude":-119.48225,"latitude":40.37425,"height":10040.77},{"longitude":-119.36212,"latitude":40.46764,"height":10040.95},{"longitude":-119.23717,"latitude":40.56432,"height":10041.15},{"longitude":-119.11108,"latitude":40.66152,"height":10041.4},{"longitude":-118.9834,"latitude":40.75946,"height":10041.66},{"longitude":-118.85547,"latitude":40.85713,"height":10041.97},{"longitude":-118.72528,"latitude":40.95625,"height":10042.26},{"longitude":-118.59631,"latitude":41.05385,"height":10042.52},{"longitude":-118.46595,"latitude":41.15213,"height":10042.76},{"longitude":-118.34192,"latitude":41.24524,"height":10042.98},{"longitude":-118.21114,"latitude":41.34295,"height":10043.29},{"longitude":-118.20084,"latitude":41.35063,"height":10043.32},{"longitude":-118.03749,"latitude":41.47218,"height":10043.8},{"longitude":-118.02363,"latitude":41.48293,"height":10043.85},{"longitude":-118.00575,"latitude":41.49732,"height":10043.91},{"longitude":-117.99279,"latitude":41.50822,"height":10043.95},{"longitude":-117.88224,"latitude":41.62019,"height":10044.46},{"longitude":-117.77487,"latitude":41.73303,"height":10044.97},{"longitude":-117.71091,"latitude":41.79902,"height":10045.22},{"longitude":-117.54896,"latitude":41.96512,"height":10045.77},{"longitude":-117.44167,"latitude":42.07448,"height":10046.02},{"longitude":-117.33009,"latitude":42.18782,"height":10046.24},{"longitude":-117.22356,"latitude":42.29567,"height":10046.47},{"longitude":-117.11202,"latitude":42.40792,"height":10046.72},{"longitude":-117.00414,"latitude":42.51599,"height":10047.01},{"longitude":-116.89089,"latitude":42.62896,"height":10047.23},{"longitude":-116.78223,"latitude":42.73691,"height":10047.44},{"longitude":-116.67059,"latitude":42.84728,"height":10047.47},{"longitude":-116.56448,"latitude":42.95175,"height":10047.46},{"longitude":-116.45987,"latitude":43.05432,"height":10047.4},{"longitude":-116.35005,"latitude":43.16137,"height":10047.34},{"longitude":-116.24506,"latitude":43.26334,"height":10047.36},{"longitude":-116.13922,"latitude":43.36574,"height":10047.47},{"longitude":-116.03102,"latitude":43.46997,"height":10047.65},{"longitude":-115.91975,"latitude":43.58192,"height":10047.9},{"longitude":-115.81421,"latitude":43.69277,"height":10048.15},{"longitude":-115.70801,"latitude":43.80258,"height":10048.42},{"longitude":-115.59547,"latitude":43.91822,"height":10048.71},{"longitude":-115.48815,"latitude":44.02803,"height":10048.97},{"longitude":-115.38025,"latitude":44.13795,"height":10049.29},{"longitude":-115.26595,"latitude":44.25382,"height":10049.57},{"longitude":-115.15695,"latitude":44.36372,"height":10049.78},{"longitude":-115.04876,"latitude":44.47243,"height":10049.92},{"longitude":-114.94008,"latitude":44.5811,"height":10049.96},{"longitude":-114.83057,"latitude":44.68991,"height":10049.93},{"longitude":-114.72199,"latitude":44.79744,"height":10049.89},{"longitude":-114.61474,"latitude":44.90318,"height":10049.86},{"longitude":-114.50775,"latitude":45.0081,"height":10049.83},{"longitude":-114.39586,"latitude":45.11742,"height":10049.89},{"longitude":-114.28724,"latitude":45.22288,"height":10049.95},{"longitude":-114.1452,"latitude":45.36018,"height":10050.06},{"longitude":-114.03063,"latitude":45.47031,"height":10050.15},{"longitude":-113.91023,"latitude":45.56812,"height":10050.28},{"longitude":-113.77957,"latitude":45.67081,"height":10050.45},{"longitude":-113.65418,"latitude":45.76769,"height":10050.63},{"longitude":-113.52166,"latitude":45.86923,"height":10050.8},{"longitude":-113.39298,"latitude":45.9674,"height":10050.95},{"longitude":-113.25732,"latitude":46.07053,"height":10051},{"longitude":-113.12656,"latitude":46.16925,"height":10050.95},{"longitude":-112.99599,"latitude":46.26736,"height":10050.88},{"longitude":-112.85692,"latitude":46.37138,"height":10050.79},{"longitude":-112.72378,"latitude":46.47044,"height":10050.7},{"longitude":-112.59017,"latitude":46.56935,"height":10050.71},{"longitude":-112.45451,"latitude":46.66919,"height":10050.75},{"longitude":-112.40219,"latitude":46.7075,"height":10050.75},{"longitude":-112.18308,"latitude":46.86731,"height":10050.72},{"longitude":-112.04336,"latitude":46.9686,"height":10050.62},{"longitude":-111.91223,"latitude":47.07069,"height":10050.47},{"longitude":-111.78719,"latitude":47.17534,"height":10050.26},{"longitude":-111.65659,"latitude":47.28245,"height":10050.09},{"longitude":-111.52737,"latitude":47.38783,"height":10049.95},{"longitude":-111.39635,"latitude":47.49399,"height":10049.81},{"longitude":-111.26383,"latitude":47.60092,"height":10049.73},{"longitude":-111.13261,"latitude":47.70612,"height":10049.56},{"longitude":-110.9972,"latitude":47.81413,"height":10049.38},{"longitude":-110.86276,"latitude":47.92076,"height":10049.15},{"longitude":-110.72704,"latitude":48.02771,"height":10048.89},{"longitude":-110.59324,"latitude":48.13269,"height":10048.71},{"longitude":-110.45213,"latitude":48.24274,"height":10048.51},{"longitude":-110.29809,"latitude":48.36214,"height":10048.31},{"longitude":-110.15818,"latitude":48.46991,"height":10048.12},{"longitude":-110.01434,"latitude":48.58001,"height":10047.89},{"longitude":-109.87766,"latitude":48.68405,"height":10047.65},{"longitude":-109.73201,"latitude":48.79427,"height":10047.4},{"longitude":-109.59253,"latitude":48.89912,"height":10047.26},{"longitude":-109.4451,"latitude":49.00946,"height":10047.11},{"longitude":-109.29828,"latitude":49.12085,"height":10047.1},{"longitude":-109.15861,"latitude":49.22635,"height":10047.09},{"longitude":-109.00909,"latitude":49.33844,"height":10047.04},{"longitude":-108.86092,"latitude":49.44878,"height":10046.98},{"longitude":-108.71825,"latitude":49.55443,"height":10046.88},{"longitude":-108.56899,"latitude":49.66429,"height":10046.72},{"longitude":-108.42393,"latitude":49.77044,"height":10046.57},{"longitude":-108.27145,"latitude":49.88123,"height":10046.36},{"longitude":-108.1247,"latitude":49.98719,"height":10046.11},{"longitude":-107.97197,"latitude":50.09683,"height":10045.75},{"longitude":-107.82331,"latitude":50.20291,"height":10045.33},{"longitude":-107.68083,"latitude":50.30452,"height":10044.86},{"longitude":-107.47946,"latitude":50.46744,"height":10044.09},{"longitude":-107.34006,"latitude":50.57956,"height":10043.61},{"longitude":-107.20117,"latitude":50.69032,"height":10043.17},{"longitude":-107.06024,"latitude":50.80199,"height":10042.81},{"longitude":-106.91856,"latitude":50.91358,"height":10042.53},{"longitude":-106.7762,"latitude":51.02502,"height":10042.3},{"longitude":-106.63352,"latitude":51.136,"height":10042.14},{"longitude":-106.48335,"latitude":51.25195,"height":10042},{"longitude":-106.33897,"latitude":51.36282,"height":10041.91},{"longitude":-106.19385,"latitude":51.47346,"height":10041.81},{"longitude":-106.05192,"latitude":51.58099,"height":10041.72},{"longitude":-105.89882,"latitude":51.69621,"height":10041.62},{"longitude":-105.75058,"latitude":51.80705,"height":10041.51},{"longitude":-105.60936,"latitude":51.91196,"height":10041.39},{"longitude":-105.45824,"latitude":52.02352,"height":10041.25},{"longitude":-105.30106,"latitude":52.13869,"height":10041.07},{"longitude":-105.14606,"latitude":52.25153,"height":10040.87},{"longitude":-104.99657,"latitude":52.35965,"height":10040.58},{"longitude":-104.83852,"latitude":52.47313,"height":10040.27},{"longitude":-104.68841,"latitude":52.58019,"height":10039.9},{"longitude":-104.5369,"latitude":52.68745,"height":10039.52},{"longitude":-104.38322,"latitude":52.79568,"height":10039.14},{"longitude":-104.36918,"latitude":52.80551,"height":10039.1},{"longitude":-104.14574,"latitude":52.96129,"height":10038.5},{"longitude":-104.08882,"latitude":53.00075,"height":10038.34},{"longitude":-103.66236,"latitude":53.29321,"height":10037.06},{"longitude":-103.50163,"latitude":53.40198,"height":10036.52},{"longitude":-103.34328,"latitude":53.50841,"height":10035.99},{"longitude":-103.18163,"latitude":53.61635,"height":10035.45},{"longitude":-103.01807,"latitude":53.72468,"height":10034.91},{"longitude":-102.85287,"latitude":53.83333,"height":10034.47},{"longitude":-102.6947,"latitude":53.93663,"height":10034.08},{"longitude":-102.67634,"latitude":53.94859,"height":10034.03},{"longitude":-102.48911,"latitude":54.06987,"height":10033.65},{"longitude":-102.2399,"latitude":54.22977,"height":10033.22},{"longitude":-102.07179,"latitude":54.33659,"height":10032.94},{"longitude":-101.89569,"latitude":54.44769,"height":10032.64},{"longitude":-101.70779,"latitude":54.56534,"height":10032.33},{"longitude":-101.63161,"latitude":54.61276,"height":10032.22},{"longitude":-100.99348,"latitude":55.0037,"height":10031.42},{"longitude":-100.81579,"latitude":55.11273,"height":10031.19},{"longitude":-100.63565,"latitude":55.22264,"height":10030.93},{"longitude":-100.44937,"latitude":55.33539,"height":10030.6},{"longitude":-100.2748,"latitude":55.44008,"height":10030.29},{"longitude":-100.0996,"latitude":55.54445,"height":10030},{"longitude":-99.92199,"latitude":55.64932,"height":10029.73},{"longitude":-99.74412,"latitude":55.75351,"height":10029.49},{"longitude":-99.56592,"latitude":55.85728,"height":10029.14},{"longitude":-99.39177,"latitude":55.95775,"height":10028.76},{"longitude":-99.21032,"latitude":56.0617,"height":10028.26},{"longitude":-99.03151,"latitude":56.16321,"height":10027.69},{"longitude":-98.85481,"latitude":56.26291,"height":10027.12},{"longitude":-98.75731,"latitude":56.3175,"height":10026.81},{"longitude":-92.14444,"latitude":59.53107,"height":10623.76},{"longitude":-91.9352,"latitude":59.61856,"height":10623.89},{"longitude":-91.7233,"latitude":59.7063,"height":10624.05},{"longitude":-91.50816,"latitude":59.79458,"height":10624.26},{"longitude":-91.29959,"latitude":59.87933,"height":10624.49},{"longitude":-91.08373,"latitude":59.96636,"height":10624.75},{"longitude":-90.88204,"latitude":60.06123,"height":10624.98},{"longitude":-90.70332,"latitude":60.17049,"height":10625.19},{"longitude":-90.51695,"latitude":60.27779,"height":10625.42},{"longitude":-90.33527,"latitude":60.38063,"height":10625.63},{"longitude":-90.149,"latitude":60.48518,"height":10625.84},{"longitude":-90.02708,"latitude":60.5532,"height":10625.97},{"longitude":-89.74967,"latitude":60.70626,"height":10626.24},{"longitude":-89.617,"latitude":60.77884,"height":10626.34},{"longitude":-87.30364,"latitude":61.97255,"height":10628.64},{"longitude":-59.43304,"latitude":68.13538,"height":10694.36},{"longitude":-59.06637,"latitude":68.17969,"height":10695.72},{"longitude":-58.69851,"latitude":68.22324,"height":10696.85},{"longitude":-58.32642,"latitude":68.26625,"height":10697.56},{"longitude":-57.95463,"latitude":68.30823,"height":10697.89},{"longitude":-57.58284,"latitude":68.34924,"height":10698.01},{"longitude":-57.21012,"latitude":68.38943,"height":10698.12},{"longitude":-56.83685,"latitude":68.42862,"height":10698.38},{"longitude":-56.46272,"latitude":68.46693,"height":10698.76},{"longitude":-56.08337,"latitude":68.50484,"height":10699.18},{"longitude":-55.70435,"latitude":68.54182,"height":10699.41},{"longitude":-55.31946,"latitude":68.57824,"height":10699.27},{"longitude":-54.92968,"latitude":68.61415,"height":10698.75},{"longitude":-54.5568,"latitude":68.64748,"height":10698.01},{"longitude":-54.16822,"latitude":68.6814,"height":10697.2},{"longitude":-53.78302,"latitude":68.71394,"height":10696.55},{"longitude":-53.39172,"latitude":68.7459,"height":10696.21},{"longitude":-52.99648,"latitude":68.77739,"height":10696.22},{"longitude":-52.60954,"latitude":68.80714,"height":10696.5},{"longitude":-52.21953,"latitude":68.83614,"height":10696.91},{"longitude":-51.83844,"latitude":68.86361,"height":10697.44},{"longitude":-51.44309,"latitude":68.89105,"height":10698.12},{"longitude":-51.04564,"latitude":68.91775,"height":10698.95},{"longitude":-50.65205,"latitude":68.94307,"height":10699.93},{"longitude":-50.26114,"latitude":68.96736,"height":10700.99},{"longitude":-49.862,"latitude":68.9873,"height":10702.1},{"longitude":-49.45413,"latitude":68.99833,"height":10703.2},{"longitude":-49.04689,"latitude":69.00851,"height":10704.25},{"longitude":-48.65419,"latitude":69.01737,"height":10705.2},{"longitude":-48.29727,"latitude":69.02459,"height":10706.04},{"longitude":-29.1449,"latitude":67.84658,"height":11341.65},{"longitude":-28.98855,"latitude":67.82117,"height":11341.68},{"longitude":-28.52525,"latitude":67.74468,"height":11341.68},{"longitude":-28.04757,"latitude":67.66386,"height":11341.81},{"longitude":-27.71401,"latitude":67.60634,"height":11342.03},{"longitude":-27.37356,"latitude":67.54655,"height":11342.31},{"longitude":-27.0469,"latitude":67.48827,"height":11342.56},{"longitude":-26.72125,"latitude":67.42923,"height":11342.67},{"longitude":-26.39715,"latitude":67.36942,"height":11342.64},{"longitude":-26.07518,"latitude":67.30913,"height":11342.52},{"longitude":-25.7552,"latitude":67.24829,"height":11342.39},{"longitude":-25.49839,"latitude":67.19872,"height":11342.44},{"longitude":-25.02888,"latitude":67.10655,"height":11342.85},{"longitude":-24.71243,"latitude":67.04324,"height":11343.37},{"longitude":-24.39717,"latitude":66.97925,"height":11343.99},{"longitude":-24.08335,"latitude":66.91452,"height":11344.62},{"longitude":-23.77346,"latitude":66.84965,"height":11345.14},{"longitude":-23.46293,"latitude":66.78374,"height":11345.54},{"longitude":-23.15693,"latitude":66.71787,"height":11345.83},{"longitude":-22.84894,"latitude":66.65057,"height":11346.07},{"longitude":-22.54657,"latitude":66.58357,"height":11346.3},{"longitude":-22.24051,"latitude":66.51475,"height":11346.53},{"longitude":-21.94095,"latitude":66.44648,"height":11346.77},{"longitude":-21.64486,"latitude":66.37798,"height":11347},{"longitude":-21.34827,"latitude":66.30853,"height":11347.2},{"longitude":-21.05129,"latitude":66.23799,"height":11347.38},{"longitude":-20.76073,"latitude":66.168,"height":11347.56},{"longitude":-20.46514,"latitude":66.09585,"height":11347.79},{"longitude":-20.17269,"latitude":66.02355,"height":11348.04},{"longitude":-19.8698,"latitude":65.9599,"height":11348.29},{"longitude":-19.54587,"latitude":65.91103,"height":11348.51},{"longitude":-19.22667,"latitude":65.86047,"height":11348.73},{"longitude":-18.90771,"latitude":65.8089,"height":11348.91},{"longitude":-18.5854,"latitude":65.75574,"height":11349.05},{"longitude":-18.26923,"latitude":65.70277,"height":11349.11},{"longitude":-17.94079,"latitude":65.64685,"height":11349.12},{"longitude":-17.62601,"latitude":65.59234,"height":11349.1},{"longitude":-17.31125,"latitude":65.53702,"height":11349.04},{"longitude":-16.99459,"latitude":65.48039,"height":11348.95},{"longitude":-16.68549,"latitude":65.42427,"height":11348.86},{"longitude":-16.37524,"latitude":65.36705,"height":11348.81},{"longitude":-16.07058,"latitude":65.31001,"height":11348.81},{"longitude":-15.76197,"latitude":65.25128,"height":11348.82},{"longitude":-15.45353,"latitude":65.19176,"height":11348.76},{"longitude":-15.1474,"latitude":65.1318,"height":11348.59},{"longitude":-14.84413,"latitude":65.07147,"height":11348.29},{"longitude":-14.5448,"latitude":65.01105,"height":11347.88},{"longitude":-14.23416,"latitude":64.9474,"height":11347.31},{"longitude":-13.92803,"latitude":64.88374,"height":11346.75},{"longitude":-13.63037,"latitude":64.82101,"height":11346.29},{"longitude":-13.33048,"latitude":64.75685,"height":11345.94},{"longitude":-13.03505,"latitude":64.69281,"height":11345.71},{"longitude":-12.74288,"latitude":64.62856,"height":11345.56},{"longitude":-12.4541,"latitude":64.56418,"height":11345.46},{"longitude":-12.16604,"latitude":64.49899,"height":11345.34},{"longitude":-11.86913,"latitude":64.43105,"height":11345.14},{"longitude":-11.61442,"latitude":64.37192,"height":11344.91},{"longitude":-10.65684,"latitude":64.14345,"height":11343.62},{"longitude":-10.36856,"latitude":64.07259,"height":11343.14},{"longitude":-10.08732,"latitude":64.00272,"height":11342.68},{"longitude":-9.80299,"latitude":63.93689,"height":11342.26},{"longitude":-9.51532,"latitude":63.87328,"height":11341.9},{"longitude":-9.2317,"latitude":63.80892,"height":11341.63},{"longitude":-8.94171,"latitude":63.74226,"height":11341.42},{"longitude":-8.68986,"latitude":63.68351,"height":11341.25},{"longitude":-8.68986,"latitude":63.68351,"height":11341.25},{"longitude":-8.68986,"latitude":63.68351,"height":11341.25},{"longitude":-7.92336,"latitude":63.50079,"height":11340.42},{"longitude":-7.64275,"latitude":63.43227,"height":11339.93},{"longitude":-7.3626,"latitude":63.36295,"height":11339.44},{"longitude":-7.07893,"latitude":63.29186,"height":11338.96},{"longitude":-6.79746,"latitude":63.22041,"height":11338.59},{"longitude":-6.51996,"latitude":63.14909,"height":11338.35},{"longitude":-6.2396,"latitude":63.07619,"height":11338.19},{"longitude":-5.96405,"latitude":63.00343,"height":11338.03},{"longitude":-5.68573,"latitude":62.92918,"height":11337.78},{"longitude":-5.41433,"latitude":62.8559,"height":11337.48},{"longitude":-5.14192,"latitude":62.78137,"height":11337.16},{"longitude":-4.87172,"latitude":62.70662,"height":11336.81},{"longitude":-4.59666,"latitude":62.62958,"height":11336.46},{"longitude":-4.32555,"latitude":62.55266,"height":11336.15},{"longitude":-4.05406,"latitude":62.47478,"height":11335.77},{"longitude":-3.78426,"latitude":62.39643,"height":11335.2},{"longitude":-3.51362,"latitude":62.31692,"height":11334.51},{"longitude":-3.23642,"latitude":62.23443,"height":11333.7},{"longitude":-2.95807,"latitude":62.15054,"height":11332.93},{"longitude":-2.68351,"latitude":62.0668,"height":11332.33},{"longitude":-2.40287,"latitude":61.98033,"height":11331.99},{"longitude":-2.12929,"latitude":61.89487,"height":11332.02},{"longitude":-1.85286,"latitude":61.80753,"height":11332.24},{"longitude":-1.58244,"latitude":61.72105,"height":11332.59},{"longitude":-1.29796,"latitude":61.629,"height":11332.95},{"longitude":-0.99897,"latitude":61.53575,"height":11333.24},{"longitude":-0.72598,"latitude":61.44937,"height":11333.32},{"longitude":-0.4629,"latitude":61.36505,"height":11333.18},{"longitude":-0.20344,"latitude":61.28091,"height":11332.86},{"longitude":0.06082,"latitude":61.19394,"height":11332.32},{"longitude":0.30075,"latitude":61.10381,"height":11331.7},{"longitude":0.55559,"latitude":61.00829,"height":11331.04},{"longitude":0.80816,"latitude":60.91292,"height":11330.49},{"longitude":1.05645,"latitude":60.81812,"height":11330.09},{"longitude":1.20163,"latitude":60.76212,"height":11329.93},{"longitude":1.55545,"latitude":60.62428,"height":11329.72},{"longitude":1.7891,"latitude":60.53211,"height":11329.61},{"longitude":2.11271,"latitude":60.40288,"height":11329.37},{"longitude":2.34208,"latitude":60.31018,"height":11329.1},{"longitude":2.58365,"latitude":60.2115,"height":11328.73},{"longitude":2.82178,"latitude":60.11334,"height":11328.3},{"longitude":3.05901,"latitude":60.01431,"height":11327.89},{"longitude":3.30066,"latitude":59.91238,"height":11327.52},{"longitude":3.54318,"latitude":59.80911,"height":11327.27},{"longitude":3.81699,"latitude":59.69128,"height":11327.18},{"longitude":4.04382,"latitude":59.59264,"height":11327.21},{"longitude":4.26781,"latitude":59.49413,"height":11327.28},{"longitude":4.48981,"latitude":59.39563,"height":11327.33},{"longitude":4.71266,"latitude":59.29577,"height":11327.27},{"longitude":4.9339,"latitude":59.19569,"height":11327.12},{"longitude":5.15121,"latitude":59.09647,"height":11326.93},{"longitude":5.369,"latitude":58.99593,"height":11326.76},{"longitude":5.58712,"latitude":58.89445,"height":11326.64},{"longitude":5.80106,"latitude":58.79399,"height":11326.63},{"longitude":6.01209,"latitude":58.69382,"height":11326.61},{"longitude":6.22302,"latitude":58.59279,"height":11326.54},{"longitude":6.43561,"latitude":58.49014,"height":11326.41},{"longitude":6.64318,"latitude":58.38904,"height":11326.06},{"longitude":6.85901,"latitude":58.28279,"height":11325.58},{"longitude":7.06518,"latitude":58.18048,"height":11325.08},{"longitude":7.33904,"latitude":58.04292,"height":11324.34},{"longitude":7.54349,"latitude":57.93929,"height":11323.87},{"longitude":7.75497,"latitude":57.83101,"height":11323.44},{"longitude":7.96483,"latitude":57.72258,"height":11323.05},{"longitude":8.21414,"latitude":57.59252,"height":11322.7},{"longitude":8.41748,"latitude":57.48535,"height":11322.44},{"longitude":8.61745,"latitude":57.3788,"height":11322.24},{"longitude":8.82158,"latitude":57.26926,"height":11322.04},{"longitude":8.97506,"latitude":57.19446,"height":11321.91},{"longitude":9.00507,"latitude":57.18388,"height":11321.88},{"longitude":9.26585,"latitude":57.09398,"height":10613},{"longitude":9.50849,"latitude":57.00964,"height":9820.32},{"longitude":9.78744,"latitude":56.91142,"height":9141.98},{"longitude":10.01519,"latitude":56.83041,"height":8555.11},{"longitude":10.23368,"latitude":56.75202,"height":8044.42},{"longitude":10.44206,"latitude":56.67646,"height":7510.89},{"longitude":10.6392,"latitude":56.6044,"height":6977.33},{"longitude":10.83072,"latitude":56.53383,"height":6359.92},{"longitude":11.00705,"latitude":56.4684,"height":5826.32},{"longitude":11.18348,"latitude":56.4025,"height":5368.92},{"longitude":11.27506,"latitude":56.36806,"height":5224.04},{"longitude":11.35806,"latitude":56.33677,"height":5223.95},{"longitude":11.43522,"latitude":56.30759,"height":5223.86},{"longitude":11.51525,"latitude":56.27714,"height":5200.91},{"longitude":11.6019,"latitude":56.2441,"height":4804.58},{"longitude":11.69271,"latitude":56.20927,"height":4347.29},{"longitude":11.77829,"latitude":56.17645,"height":4034.79},{"longitude":11.86415,"latitude":56.14343,"height":3806.12},{"longitude":11.94858,"latitude":56.11081,"height":3524.1},{"longitude":11.9781,"latitude":56.0994,"height":3394.53},{"longitude":12.00814,"latitude":56.08772,"height":3295.44},{"longitude":12.03852,"latitude":56.07591,"height":3196.35},{"longitude":12.06931,"latitude":56.06392,"height":3142.99},{"longitude":12.09844,"latitude":56.05261,"height":3120.1},{"longitude":12.12674,"latitude":56.04163,"height":3097.22},{"longitude":12.15362,"latitude":56.03114,"height":3074.33},{"longitude":12.18075,"latitude":56.02059,"height":3051.45},{"longitude":12.20744,"latitude":56.01016,"height":3028.56},{"longitude":12.23328,"latitude":56.00001,"height":2998.06},{"longitude":12.25825,"latitude":55.99019,"height":2944.7},{"longitude":12.28366,"latitude":55.98023,"height":2868.48},{"longitude":12.30761,"latitude":55.97082,"height":2746.55},{"longitude":12.33224,"latitude":55.96115,"height":2616.99},{"longitude":12.35754,"latitude":55.95117,"height":2472.19},{"longitude":12.38201,"latitude":55.94156,"height":2335.01},{"longitude":12.41163,"latitude":55.9299,"height":2190.21},{"longitude":12.43567,"latitude":55.92041,"height":2053.03},{"longitude":12.46058,"latitude":55.91052,"height":1938.7},{"longitude":12.48321,"latitude":55.90156,"height":1824.38},{"longitude":12.50836,"latitude":55.89155,"height":1694.82},{"longitude":12.53124,"latitude":55.88246,"height":1595.74},{"longitude":12.5542,"latitude":55.87334,"height":1504.28},{"longitude":12.56703,"latitude":55.86827,"height":1458.55},{"longitude":12.58939,"latitude":55.85938,"height":1351.85},{"longitude":12.60165,"latitude":55.85454,"height":1306.12},{"longitude":12.62398,"latitude":55.84569,"height":1214.66},{"longitude":12.63316,"latitude":55.84206,"height":1176.55},{"longitude":12.64551,"latitude":55.83714,"height":1130.81},{"longitude":12.66682,"latitude":55.82863,"height":1062.21},{"longitude":12.68605,"latitude":55.82094,"height":1016.47},{"longitude":12.70785,"latitude":55.81224,"height":955.49},{"longitude":12.72658,"latitude":55.80473,"height":924.99},{"longitude":12.73615,"latitude":55.80093,"height":902.12},{"longitude":12.74526,"latitude":55.79728,"height":871.63},{"longitude":12.76362,"latitude":55.78995,"height":841.13},{"longitude":12.77244,"latitude":55.78638,"height":818.26},{"longitude":12.78259,"latitude":55.78234,"height":795.39},{"longitude":12.80016,"latitude":55.7753,"height":734.41},{"longitude":12.80954,"latitude":55.77102,"height":703.92},{"longitude":12.81495,"latitude":55.7673,"height":673.43},{"longitude":12.82013,"latitude":55.76074,"height":642.94},{"longitude":12.81747,"latitude":55.7384,"height":612.43},{"longitude":12.8148,"latitude":55.73186,"height":597.19},{"longitude":12.81186,"latitude":55.72503,"height":597.18},{"longitude":12.80388,"latitude":55.71316,"height":597.17},{"longitude":12.78018,"latitude":55.69752,"height":581.93},{"longitude":12.77219,"latitude":55.69258,"height":536.21},{"longitude":12.7571,"latitude":55.68304,"height":475.24},{"longitude":12.75097,"latitude":55.67903,"height":429.52},{"longitude":12.727,"latitude":55.66365,"height":307.61},{"longitude":12.6853,"latitude":55.63683,"height":86.64},{"longitude":12.64044,"latitude":55.60784,"height":40.93},{"longitude":12.63927,"latitude":55.60707,"height":40.93},{"longitude":12.63853,"latitude":55.60685,"height":40.93},{"longitude":12.63777,"latitude":55.60692,"height":40.93},{"longitude":12.63715,"latitude":55.60722,"height":40.93},{"longitude":12.63595,"latitude":55.6083,"height":40.94},{"longitude":12.6364,"latitude":55.60869,"height":40.94},{"longitude":12.63698,"latitude":55.60918,"height":40.94},{"longitude":12.63788,"latitude":55.60994,"height":40.94},{"longitude":12.63842,"latitude":55.61042,"height":40.94},{"longitude":12.63904,"latitude":55.61097,"height":40.93},{"longitude":12.64046,"latitude":55.6122,"height":40.93},{"longitude":12.64114,"latitude":55.61282,"height":40.93},{"longitude":12.64187,"latitude":55.61343,"height":40.93},{"longitude":12.64267,"latitude":55.61413,"height":40.93},{"longitude":12.64345,"latitude":55.61482,"height":40.93},{"longitude":12.64487,"latitude":55.61603,"height":40.93},{"longitude":12.64535,"latitude":55.61645,"height":40.93},{"longitude":12.64568,"latitude":55.61689,"height":40.93},{"longitude":12.64554,"latitude":55.61756,"height":40.93},{"longitude":12.64539,"latitude":55.61799,"height":40.93},{"longitude":12.6452,"latitude":55.61862,"height":40.93},{"longitude":12.64503,"latitude":55.61921,"height":40.94},{"longitude":12.64507,"latitude":55.61959,"height":40.94},{"longitude":12.64531,"latitude":55.61997,"height":40.94},{"longitude":12.6457,"latitude":55.62033,"height":40.94},{"longitude":12.64616,"latitude":55.62074,"height":40.94},{"longitude":12.64662,"latitude":55.62112,"height":40.94},{"longitude":12.64732,"latitude":55.62171,"height":40.93},{"longitude":12.64784,"latitude":55.62218,"height":40.93},{"longitude":12.64791,"latitude":55.62269,"height":40.94},{"longitude":12.64786,"latitude":55.62305,"height":40.94},{"longitude":12.64782,"latitude":55.62333,"height":40.94},{"longitude":12.6478,"latitude":55.62367,"height":40.94},{"longitude":12.64776,"latitude":55.62396,"height":40.94},{"longitude":12.64774,"latitude":55.62442,"height":40.94},{"longitude":12.64774,"latitude":55.62472,"height":40.94},{"longitude":12.64788,"latitude":55.62494,"height":40.94},{"longitude":12.6483,"latitude":55.62496,"height":40.94},{"longitude":12.64852,"latitude":55.62494,"height":40.94},{"longitude":12.64878,"latitude":55.62493,"height":40.94},{"longitude":12.64904,"latitude":55.62492,"height":40.94},{"longitude":12.64928,"latitude":55.62491,"height":40.94},{"longitude":12.64936,"latitude":55.6249,"height":40.94},{"longitude":12.64949,"latitude":55.62442,"height":40.94},{"longitude":12.64936,"latitude":55.6247,"height":40.94}]');/* Initialize the viewer clock:  Assume the radar samples are 30 seconds apart, and calculate the entire flight duration based on that assumption.  Get the start and stop date times of the flight, where the start is the known flight departure time (converted from PST     to UTC) and the stop is the start plus the calculated duration. (Note that Cesium uses Julian dates. See     https://simple.wikipedia.org/wiki/Julian_day.)  Initialize the viewer's clock by setting its start and stop to the flight start and stop times we just calculated.   Also, set the viewer's current time to the start time and take the user to that time. */const timeStepInSeconds = 30;const totalSeconds = timeStepInSeconds * (flightData.length - 1);const start = Cesium.JulianDate.fromIso8601("2020-03-09T23:10:00Z");const stop = Cesium.JulianDate.addSeconds(start, totalSeconds, new Cesium.JulianDate());viewer.clock.startTime = start.clone();viewer.clock.stopTime = stop.clone();viewer.clock.currentTime = start.clone();viewer.timeline.zoomTo(start, stop);// Speed up the playback speed 50x.viewer.clock.multiplier = 50;// Start playing the scene.viewer.clock.shouldAnimate = true;// The SampledPositionedProperty stores the position and timestamp for each sample along the radar sample series.const positionProperty = new Cesium.SampledPositionProperty();for (let i = 0; i < flightData.length; i++) {  const dataPoint = flightData[i];  // Declare the time for this individual sample and store it in a new JulianDate instance.  const time = Cesium.JulianDate.addSeconds(start, i * timeStepInSeconds, new Cesium.JulianDate());  const position = Cesium.Cartesian3.fromDegrees(dataPoint.longitude, dataPoint.latitude, dataPoint.height);  // Store the position along with its timestamp.  // Here we add the positions all upfront, but these can be added at run-time as samples are received from a server.  positionProperty.addSample(time, position);  viewer.entities.add({    description: `Location: (${dataPoint.longitude}, ${dataPoint.latitude}, ${dataPoint.height})`,    position: position,    point: { pixelSize: 10, color: Cesium.Color.RED }  });}// STEP 4 CODE (green circle entity)// Create an entity to both visualize the entire radar sample series with a line and add a point that moves along the samples.const airplaneEntity = viewer.entities.add({  availability: new Cesium.TimeIntervalCollection([ new Cesium.TimeInterval({ start: start, stop: stop }) ]),  position: positionProperty,  point: { pixelSize: 30, color: Cesium.Color.GREEN },  path: new Cesium.PathGraphics({ width: 3 })});// Make the camera track this moving entity.viewer.trackedEntity = airplaneEntity;
复制代码


从这趟跨大西洋航班,我们可以看到 3D 可视化为何能大大降低数据的理解难度。不过雷达样本的连接线大多是直的,我们可以在 2D 地图上使用常见的 Web 墨卡托投影,用曲线表示飞机的起降轨迹。



6、上传飞机模型


最后一步,我们把飞机的 3D 模型添加到实体当中,替换掉简陋的绿色圆圈。


1 下载飞机的 3D 模型(https://s3.amazonaws.com/cesiumjs/downloads/Cesium_Air.glb)。


2 前往账户仪表板,将模型文件拖进此页面。


3 选择 3D Model(Convert to glTF),之后点击 Upload。


4 处理完成之后,通过在仪表板中选择新资产并查看右侧的预览窗口,即可找到资产 ID。


7、添加飞机模型


1 删除从以下行开始的之后所有代码:


// STEP 4 CODE (green circle entity)
复制代码


2 替换为以下代码。


3 将 your_asset_id 部分替换为你的资产 ID。


// STEP 6 CODE (airplane entity)async function loadModel() {  // Load the glTF model from Cesium ion.  const airplaneUri = await Cesium.IonResource.fromAssetId(your_asset_id);  const airplaneEntity = viewer.entities.add({    availability: new Cesium.TimeIntervalCollection([ new Cesium.TimeInterval({ start: start, stop: stop }) ]),    position: positionProperty,    // Attach the 3D model instead of the green point.    model: { uri: airplaneUri },    // Automatically compute the orientation from the position.    orientation: new Cesium.VelocityOrientationProperty(positionProperty),        path: new Cesium.PathGraphics({ width: 3 })  });    viewer.trackedEntity = airplaneEntity;}loadModel();
复制代码


现在,我们就有了能够跟随飞行雷达样本持续前进的飞机模型!如果大家有自己的 3D 模型,也可以尝试添加到场景中。

完整源代码

以下是此应用的完整源代码,其中包含 your_token_here 以及 your_asset_id 占位符。


<!DOCTYPE html><html lang="en"><head>  <script src="https://cesium.com/downloads/cesiumjs/releases/1.96/Build/Cesium/Cesium.js"></script>  <link href="https://cesium.com/downloads/cesiumjs/releases/1.96/Build/Cesium/Widgets/widgets.css" rel="stylesheet">  <link href="style.css" rel="stylesheet"></head><body>  <div id="cesiumContainer"></div>  <script>    // Your access token can be found at: https://cesium.com/ion/tokens.    // Replace `your_access_token` with your Cesium ion access token.    Cesium.Ion.defaultAccessToken = 'your_access_token';    // STEP 4 CODE (replaces steps 2 and 3)    // Keep your `Cesium.Ion.defaultAccessToken = 'your_token_here'` line from before here.     const viewer = new Cesium.Viewer('cesiumContainer', {      terrainProvider: Cesium.createWorldTerrain()    });    const osmBuildings = viewer.scene.primitives.add(Cesium.createOsmBuildings());    const flightData = JSON.parse(      '[{"longitude":-122.39053,"latitude":37.61779,"height":-27.32},{"longitude":-122.39035,"latitude":37.61803,"height":-27.32},{"longitude":-122.39019,"latitude":37.61826,"height":-27.32},{"longitude":-122.39006,"latitude":37.6185,"height":-27.32},{"longitude":-122.38985,"latitude":37.61864,"height":-27.32},{"longitude":-122.39005,"latitude":37.61874,"height":-27.32},{"longitude":-122.39027,"latitude":37.61884,"height":-27.32},{"longitude":-122.39057,"latitude":37.61898,"height":-27.32},{"longitude":-122.39091,"latitude":37.61912,"height":-27.32},{"longitude":-122.39121,"latitude":37.61926,"height":-27.32},{"longitude":-122.39153,"latitude":37.61937,"height":-27.32},{"longitude":-122.39175,"latitude":37.61948,"height":-27.32},{"longitude":-122.39207,"latitude":37.6196,"height":-27.32},{"longitude":-122.39247,"latitude":37.61983,"height":-27.32},{"longitude":-122.39253,"latitude":37.62005,"height":-27.32},{"longitude":-122.39226,"latitude":37.62048,"height":-27.32},{"longitude":-122.39207,"latitude":37.62075,"height":-27.32},{"longitude":-122.39186,"latitude":37.62106,"height":-27.32},{"longitude":-122.39172,"latitude":37.62127,"height":-27.32},{"longitude":-122.39141,"latitude":37.62174,"height":-27.32},{"longitude":-122.39097,"latitude":37.62227,"height":-27.32},{"longitude":-122.39061,"latitude":37.6224,"height":-27.31},{"longitude":-122.39027,"latitude":37.62249,"height":-27.31},{"longitude":-122.38993,"latitude":37.62256,"height":-27.31},{"longitude":-122.3895,"latitude":37.62267,"height":-27.31},{"longitude":-122.3889,"latitude":37.62256,"height":-27.31},{"longitude":-122.38854,"latitude":37.62242,"height":-27.31},{"longitude":-122.38814,"latitude":37.62225,"height":-27.31},{"longitude":-122.38778,"latitude":37.62209,"height":-27.31},{"longitude":-122.38744,"latitude":37.62195,"height":-27.31},{"longitude":-122.38671,"latitude":37.62164,"height":-27.31},{"longitude":-122.38638,"latitude":37.62151,"height":-27.31},{"longitude":-122.38604,"latitude":37.62136,"height":-27.31},{"longitude":-122.38571,"latitude":37.62123,"height":-27.31},{"longitude":-122.38512,"latitude":37.62098,"height":-27.31},{"longitude":-122.3848,"latitude":37.62084,"height":-27.31},{"longitude":-122.38453,"latitude":37.62074,"height":-27.31},{"longitude":-122.38425,"latitude":37.62062,"height":-27.3},{"longitude":-122.38397,"latitude":37.62049,"height":-27.3},{"longitude":-122.38372,"latitude":37.62039,"height":-27.3},{"longitude":-122.3835,"latitude":37.6203,"height":-27.3},{"longitude":-122.38324,"latitude":37.62019,"height":-27.3},{"longitude":-122.38271,"latitude":37.61996,"height":-27.3},{"longitude":-122.38248,"latitude":37.61986,"height":-27.3},{"longitude":-122.38191,"latitude":37.61962,"height":-27.3},{"longitude":-122.38159,"latitude":37.6195,"height":-27.3},{"longitude":-122.38126,"latitude":37.61935,"height":-27.3},{"longitude":-122.38058,"latitude":37.61906,"height":-27.3},{"longitude":-122.38026,"latitude":37.61894,"height":-27.3},{"longitude":-122.37955,"latitude":37.61863,"height":-27.3},{"longitude":-122.37913,"latitude":37.61847,"height":-27.3},{"longitude":-122.3781,"latitude":37.61813,"height":-27.3},{"longitude":-122.37763,"latitude":37.61799,"height":-27.29},{"longitude":-122.37663,"latitude":37.61768,"height":-27.29},{"longitude":-122.37617,"latitude":37.61753,"height":-27.29},{"longitude":-122.37561,"latitude":37.61736,"height":-27.29},{"longitude":-122.37532,"latitude":37.61727,"height":-27.29},{"longitude":-122.37506,"latitude":37.61718,"height":-27.29},{"longitude":-122.37468,"latitude":37.61704,"height":-27.29},{"longitude":-122.37436,"latitude":37.61689,"height":-27.29},{"longitude":-122.37402,"latitude":37.61674,"height":-27.29},{"longitude":-122.37362,"latitude":37.61657,"height":-27.29},{"longitude":-122.3732,"latitude":37.6164,"height":-27.29},{"longitude":-122.37235,"latitude":37.61604,"height":-27.29},{"longitude":-122.37198,"latitude":37.61588,"height":-27.29},{"longitude":-122.3716,"latitude":37.61573,"height":-27.28},{"longitude":-122.3712,"latitude":37.61555,"height":-27.28},{"longitude":-122.37032,"latitude":37.61518,"height":-27.28},{"longitude":-122.36938,"latitude":37.61476,"height":-27.28},{"longitude":-122.36872,"latitude":37.6143,"height":-27.28},{"longitude":-122.36811,"latitude":37.61387,"height":-27.28},{"longitude":-122.36747,"latitude":37.61352,"height":-27.28},{"longitude":-122.36672,"latitude":37.61321,"height":-27.28},{"longitude":-122.36602,"latitude":37.61292,"height":-27.28},{"longitude":-122.3655,"latitude":37.61269,"height":-27.28},{"longitude":-122.36498,"latitude":37.61247,"height":-27.27},{"longitude":-122.3639,"latitude":37.61203,"height":-27.27},{"longitude":-122.36337,"latitude":37.6118,"height":-27.27},{"longitude":-122.36254,"latitude":37.61146,"height":-27.27},{"longitude":-122.36203,"latitude":37.61124,"height":-27.27},{"longitude":-122.36154,"latitude":37.61103,"height":-27.27},{"longitude":-122.36106,"latitude":37.61082,"height":-27.27},{"longitude":-122.36029,"latitude":37.61052,"height":-27.27},{"longitude":-122.35989,"latitude":37.61048,"height":-27.27},{"longitude":-122.35953,"latitude":37.61055,"height":-27.27},{"longitude":-122.35922,"latitude":37.61074,"height":-27.26},{"longitude":-122.35893,"latitude":37.61117,"height":-27.26},{"longitude":-122.35875,"latitude":37.61144,"height":-27.26},{"longitude":-122.35865,"latitude":37.61171,"height":-27.26},{"longitude":-122.35889,"latitude":37.612,"height":-27.26},{"longitude":-122.35923,"latitude":37.61211,"height":-27.26},{"longitude":-122.35954,"latitude":37.61222,"height":-27.26},{"longitude":-122.36029,"latitude":37.61253,"height":-27.27},{"longitude":-122.36184,"latitude":37.61317,"height":-27.27},{"longitude":-122.36823,"latitude":37.61588,"height":-27.28},{"longitude":-122.37163,"latitude":37.61728,"height":-27.28},{"longitude":-122.38041,"latitude":37.62096,"height":-27.3},{"longitude":-122.38548,"latitude":37.6231,"height":-27.31},{"longitude":-122.3905,"latitude":37.6252,"height":10.79},{"longitude":-122.39517,"latitude":37.62721,"height":56.5},{"longitude":-122.40037,"latitude":37.62955,"height":125.07},{"longitude":-122.40507,"latitude":37.63171,"height":186.03},{"longitude":-122.41457,"latitude":37.63623,"height":292.69},{"longitude":-122.42428,"latitude":37.64062,"height":384.12},{"longitude":-122.42896,"latitude":37.64261,"height":429.83},{"longitude":-122.43398,"latitude":37.6447,"height":483.17},{"longitude":-122.44357,"latitude":37.64859,"height":582.21},{"longitude":-122.45319,"latitude":37.65243,"height":643.16},{"longitude":-122.4639,"latitude":37.65678,"height":719.35},{"longitude":-122.47395,"latitude":37.66081,"height":803.15},{"longitude":-122.47922,"latitude":37.66286,"height":841.25},{"longitude":-122.48441,"latitude":37.66489,"height":879.34},{"longitude":-122.49505,"latitude":37.66933,"height":970.77},{"longitude":-122.5003,"latitude":37.67162,"height":993.62},{"longitude":-122.51083,"latitude":37.67647,"height":1024.08},{"longitude":-122.51626,"latitude":37.67999,"height":1039.31},{"longitude":-122.52048,"latitude":37.68431,"height":1046.93},{"longitude":-122.52323,"latitude":37.68939,"height":1069.79},{"longitude":-122.52456,"latitude":37.69482,"height":1092.65},{"longitude":-122.5255,"latitude":37.70298,"height":1115.52},{"longitude":-122.52602,"latitude":37.70943,"height":1138.38},{"longitude":-122.52634,"latitude":37.71574,"height":1161.25},{"longitude":-122.51643,"latitude":37.73744,"height":1245.12},{"longitude":-122.50723,"latitude":37.74465,"height":1283.25},{"longitude":-122.50024,"latitude":37.74957,"height":1313.75},{"longitude":-122.4864,"latitude":37.75959,"height":1397.6},{"longitude":-122.47231,"latitude":37.77008,"height":1504.31},{"longitude":-122.45805,"latitude":37.78079,"height":1626.25},{"longitude":-122.44339,"latitude":37.79173,"height":1755.82},{"longitude":-122.42878,"latitude":37.80263,"height":1893.01},{"longitude":-122.41031,"latitude":37.81632,"height":2045.44},{"longitude":-122.39535,"latitude":37.82744,"height":2175},{"longitude":-122.3808,"latitude":37.8382,"height":2304.56},{"longitude":-122.36244,"latitude":37.85177,"height":2472.23},{"longitude":-122.34698,"latitude":37.86317,"height":2601.79},{"longitude":-122.33206,"latitude":37.87422,"height":2716.11},{"longitude":-122.31736,"latitude":37.88505,"height":2830.42},{"longitude":-122.29758,"latitude":37.89967,"height":2982.85},{"longitude":-122.28344,"latitude":37.91011,"height":3089.54},{"longitude":-122.2672,"latitude":37.9221,"height":3142.9},{"longitude":-122.25107,"latitude":37.93401,"height":3196.25},{"longitude":-122.235,"latitude":37.94586,"height":3241.98},{"longitude":-122.21102,"latitude":37.96354,"height":3318.19},{"longitude":-122.19532,"latitude":37.97507,"height":3386.77},{"longitude":-122.17095,"latitude":37.99296,"height":3523.94},{"longitude":-122.15459,"latitude":38.00497,"height":3630.63},{"longitude":-122.10188,"latitude":38.04364,"height":3927.88},{"longitude":-122.05068,"latitude":38.08113,"height":4247.98},{"longitude":-121.99834,"latitude":38.11944,"height":4552.84},{"longitude":-121.94544,"latitude":38.15803,"height":4842.46},{"longitude":-121.89173,"latitude":38.19722,"height":5116.83},{"longitude":-121.83744,"latitude":38.23672,"height":5368.34},{"longitude":-121.78076,"latitude":38.27786,"height":5619.88},{"longitude":-121.67054,"latitude":38.35774,"height":6001.09},{"longitude":-121.56262,"latitude":38.4366,"height":6488.97},{"longitude":-121.46884,"latitude":38.52786,"height":6984.57},{"longitude":-121.37305,"latitude":38.62742,"height":7442.27},{"longitude":-121.27969,"latitude":38.72305,"height":7869.52},{"longitude":-121.18384,"latitude":38.82103,"height":8114.16},{"longitude":-121.0849,"latitude":38.92167,"height":8419.92},{"longitude":-120.98819,"latitude":39.01978,"height":8664.74},{"longitude":-120.88629,"latitude":39.12269,"height":8917.28},{"longitude":-120.77951,"latitude":39.23016,"height":9108.83},{"longitude":-120.67163,"latitude":39.33836,"height":9376.26},{"longitude":-120.5672,"latitude":39.44264,"height":9612.99},{"longitude":-120.4577,"latitude":39.55152,"height":9910.45},{"longitude":-120.35071,"latitude":39.65748,"height":10040.03},{"longitude":-120.24274,"latitude":39.76404,"height":10040.03},{"longitude":-120.12367,"latitude":39.86746,"height":10040.02},{"longitude":-119.9956,"latitude":39.97069,"height":10040.05},{"longitude":-119.86682,"latitude":40.07272,"height":10040.2},{"longitude":-119.74329,"latitude":40.17004,"height":10040.38},{"longitude":-119.61475,"latitude":40.27084,"height":10040.57},{"longitude":-119.48225,"latitude":40.37425,"height":10040.77},{"longitude":-119.36212,"latitude":40.46764,"height":10040.95},{"longitude":-119.23717,"latitude":40.56432,"height":10041.15},{"longitude":-119.11108,"latitude":40.66152,"height":10041.4},{"longitude":-118.9834,"latitude":40.75946,"height":10041.66},{"longitude":-118.85547,"latitude":40.85713,"height":10041.97},{"longitude":-118.72528,"latitude":40.95625,"height":10042.26},{"longitude":-118.59631,"latitude":41.05385,"height":10042.52},{"longitude":-118.46595,"latitude":41.15213,"height":10042.76},{"longitude":-118.34192,"latitude":41.24524,"height":10042.98},{"longitude":-118.21114,"latitude":41.34295,"height":10043.29},{"longitude":-118.20084,"latitude":41.35063,"height":10043.32},{"longitude":-118.03749,"latitude":41.47218,"height":10043.8},{"longitude":-118.02363,"latitude":41.48293,"height":10043.85},{"longitude":-118.00575,"latitude":41.49732,"height":10043.91},{"longitude":-117.99279,"latitude":41.50822,"height":10043.95},{"longitude":-117.88224,"latitude":41.62019,"height":10044.46},{"longitude":-117.77487,"latitude":41.73303,"height":10044.97},{"longitude":-117.71091,"latitude":41.79902,"height":10045.22},{"longitude":-117.54896,"latitude":41.96512,"height":10045.77},{"longitude":-117.44167,"latitude":42.07448,"height":10046.02},{"longitude":-117.33009,"latitude":42.18782,"height":10046.24},{"longitude":-117.22356,"latitude":42.29567,"height":10046.47},{"longitude":-117.11202,"latitude":42.40792,"height":10046.72},{"longitude":-117.00414,"latitude":42.51599,"height":10047.01},{"longitude":-116.89089,"latitude":42.62896,"height":10047.23},{"longitude":-116.78223,"latitude":42.73691,"height":10047.44},{"longitude":-116.67059,"latitude":42.84728,"height":10047.47},{"longitude":-116.56448,"latitude":42.95175,"height":10047.46},{"longitude":-116.45987,"latitude":43.05432,"height":10047.4},{"longitude":-116.35005,"latitude":43.16137,"height":10047.34},{"longitude":-116.24506,"latitude":43.26334,"height":10047.36},{"longitude":-116.13922,"latitude":43.36574,"height":10047.47},{"longitude":-116.03102,"latitude":43.46997,"height":10047.65},{"longitude":-115.91975,"latitude":43.58192,"height":10047.9},{"longitude":-115.81421,"latitude":43.69277,"height":10048.15},{"longitude":-115.70801,"latitude":43.80258,"height":10048.42},{"longitude":-115.59547,"latitude":43.91822,"height":10048.71},{"longitude":-115.48815,"latitude":44.02803,"height":10048.97},{"longitude":-115.38025,"latitude":44.13795,"height":10049.29},{"longitude":-115.26595,"latitude":44.25382,"height":10049.57},{"longitude":-115.15695,"latitude":44.36372,"height":10049.78},{"longitude":-115.04876,"latitude":44.47243,"height":10049.92},{"longitude":-114.94008,"latitude":44.5811,"height":10049.96},{"longitude":-114.83057,"latitude":44.68991,"height":10049.93},{"longitude":-114.72199,"latitude":44.79744,"height":10049.89},{"longitude":-114.61474,"latitude":44.90318,"height":10049.86},{"longitude":-114.50775,"latitude":45.0081,"height":10049.83},{"longitude":-114.39586,"latitude":45.11742,"height":10049.89},{"longitude":-114.28724,"latitude":45.22288,"height":10049.95},{"longitude":-114.1452,"latitude":45.36018,"height":10050.06},{"longitude":-114.03063,"latitude":45.47031,"height":10050.15},{"longitude":-113.91023,"latitude":45.56812,"height":10050.28},{"longitude":-113.77957,"latitude":45.67081,"height":10050.45},{"longitude":-113.65418,"latitude":45.76769,"height":10050.63},{"longitude":-113.52166,"latitude":45.86923,"height":10050.8},{"longitude":-113.39298,"latitude":45.9674,"height":10050.95},{"longitude":-113.25732,"latitude":46.07053,"height":10051},{"longitude":-113.12656,"latitude":46.16925,"height":10050.95},{"longitude":-112.99599,"latitude":46.26736,"height":10050.88},{"longitude":-112.85692,"latitude":46.37138,"height":10050.79},{"longitude":-112.72378,"latitude":46.47044,"height":10050.7},{"longitude":-112.59017,"latitude":46.56935,"height":10050.71},{"longitude":-112.45451,"latitude":46.66919,"height":10050.75},{"longitude":-112.40219,"latitude":46.7075,"height":10050.75},{"longitude":-112.18308,"latitude":46.86731,"height":10050.72},{"longitude":-112.04336,"latitude":46.9686,"height":10050.62},{"longitude":-111.91223,"latitude":47.07069,"height":10050.47},{"longitude":-111.78719,"latitude":47.17534,"height":10050.26},{"longitude":-111.65659,"latitude":47.28245,"height":10050.09},{"longitude":-111.52737,"latitude":47.38783,"height":10049.95},{"longitude":-111.39635,"latitude":47.49399,"height":10049.81},{"longitude":-111.26383,"latitude":47.60092,"height":10049.73},{"longitude":-111.13261,"latitude":47.70612,"height":10049.56},{"longitude":-110.9972,"latitude":47.81413,"height":10049.38},{"longitude":-110.86276,"latitude":47.92076,"height":10049.15},{"longitude":-110.72704,"latitude":48.02771,"height":10048.89},{"longitude":-110.59324,"latitude":48.13269,"height":10048.71},{"longitude":-110.45213,"latitude":48.24274,"height":10048.51},{"longitude":-110.29809,"latitude":48.36214,"height":10048.31},{"longitude":-110.15818,"latitude":48.46991,"height":10048.12},{"longitude":-110.01434,"latitude":48.58001,"height":10047.89},{"longitude":-109.87766,"latitude":48.68405,"height":10047.65},{"longitude":-109.73201,"latitude":48.79427,"height":10047.4},{"longitude":-109.59253,"latitude":48.89912,"height":10047.26},{"longitude":-109.4451,"latitude":49.00946,"height":10047.11},{"longitude":-109.29828,"latitude":49.12085,"height":10047.1},{"longitude":-109.15861,"latitude":49.22635,"height":10047.09},{"longitude":-109.00909,"latitude":49.33844,"height":10047.04},{"longitude":-108.86092,"latitude":49.44878,"height":10046.98},{"longitude":-108.71825,"latitude":49.55443,"height":10046.88},{"longitude":-108.56899,"latitude":49.66429,"height":10046.72},{"longitude":-108.42393,"latitude":49.77044,"height":10046.57},{"longitude":-108.27145,"latitude":49.88123,"height":10046.36},{"longitude":-108.1247,"latitude":49.98719,"height":10046.11},{"longitude":-107.97197,"latitude":50.09683,"height":10045.75},{"longitude":-107.82331,"latitude":50.20291,"height":10045.33},{"longitude":-107.68083,"latitude":50.30452,"height":10044.86},{"longitude":-107.47946,"latitude":50.46744,"height":10044.09},{"longitude":-107.34006,"latitude":50.57956,"height":10043.61},{"longitude":-107.20117,"latitude":50.69032,"height":10043.17},{"longitude":-107.06024,"latitude":50.80199,"height":10042.81},{"longitude":-106.91856,"latitude":50.91358,"height":10042.53},{"longitude":-106.7762,"latitude":51.02502,"height":10042.3},{"longitude":-106.63352,"latitude":51.136,"height":10042.14},{"longitude":-106.48335,"latitude":51.25195,"height":10042},{"longitude":-106.33897,"latitude":51.36282,"height":10041.91},{"longitude":-106.19385,"latitude":51.47346,"height":10041.81},{"longitude":-106.05192,"latitude":51.58099,"height":10041.72},{"longitude":-105.89882,"latitude":51.69621,"height":10041.62},{"longitude":-105.75058,"latitude":51.80705,"height":10041.51},{"longitude":-105.60936,"latitude":51.91196,"height":10041.39},{"longitude":-105.45824,"latitude":52.02352,"height":10041.25},{"longitude":-105.30106,"latitude":52.13869,"height":10041.07},{"longitude":-105.14606,"latitude":52.25153,"height":10040.87},{"longitude":-104.99657,"latitude":52.35965,"height":10040.58},{"longitude":-104.83852,"latitude":52.47313,"height":10040.27},{"longitude":-104.68841,"latitude":52.58019,"height":10039.9},{"longitude":-104.5369,"latitude":52.68745,"height":10039.52},{"longitude":-104.38322,"latitude":52.79568,"height":10039.14},{"longitude":-104.36918,"latitude":52.80551,"height":10039.1},{"longitude":-104.14574,"latitude":52.96129,"height":10038.5},{"longitude":-104.08882,"latitude":53.00075,"height":10038.34},{"longitude":-103.66236,"latitude":53.29321,"height":10037.06},{"longitude":-103.50163,"latitude":53.40198,"height":10036.52},{"longitude":-103.34328,"latitude":53.50841,"height":10035.99},{"longitude":-103.18163,"latitude":53.61635,"height":10035.45},{"longitude":-103.01807,"latitude":53.72468,"height":10034.91},{"longitude":-102.85287,"latitude":53.83333,"height":10034.47},{"longitude":-102.6947,"latitude":53.93663,"height":10034.08},{"longitude":-102.67634,"latitude":53.94859,"height":10034.03},{"longitude":-102.48911,"latitude":54.06987,"height":10033.65},{"longitude":-102.2399,"latitude":54.22977,"height":10033.22},{"longitude":-102.07179,"latitude":54.33659,"height":10032.94},{"longitude":-101.89569,"latitude":54.44769,"height":10032.64},{"longitude":-101.70779,"latitude":54.56534,"height":10032.33},{"longitude":-101.63161,"latitude":54.61276,"height":10032.22},{"longitude":-100.99348,"latitude":55.0037,"height":10031.42},{"longitude":-100.81579,"latitude":55.11273,"height":10031.19},{"longitude":-100.63565,"latitude":55.22264,"height":10030.93},{"longitude":-100.44937,"latitude":55.33539,"height":10030.6},{"longitude":-100.2748,"latitude":55.44008,"height":10030.29},{"longitude":-100.0996,"latitude":55.54445,"height":10030},{"longitude":-99.92199,"latitude":55.64932,"height":10029.73},{"longitude":-99.74412,"latitude":55.75351,"height":10029.49},{"longitude":-99.56592,"latitude":55.85728,"height":10029.14},{"longitude":-99.39177,"latitude":55.95775,"height":10028.76},{"longitude":-99.21032,"latitude":56.0617,"height":10028.26},{"longitude":-99.03151,"latitude":56.16321,"height":10027.69},{"longitude":-98.85481,"latitude":56.26291,"height":10027.12},{"longitude":-98.75731,"latitude":56.3175,"height":10026.81},{"longitude":-92.14444,"latitude":59.53107,"height":10623.76},{"longitude":-91.9352,"latitude":59.61856,"height":10623.89},{"longitude":-91.7233,"latitude":59.7063,"height":10624.05},{"longitude":-91.50816,"latitude":59.79458,"height":10624.26},{"longitude":-91.29959,"latitude":59.87933,"height":10624.49},{"longitude":-91.08373,"latitude":59.96636,"height":10624.75},{"longitude":-90.88204,"latitude":60.06123,"height":10624.98},{"longitude":-90.70332,"latitude":60.17049,"height":10625.19},{"longitude":-90.51695,"latitude":60.27779,"height":10625.42},{"longitude":-90.33527,"latitude":60.38063,"height":10625.63},{"longitude":-90.149,"latitude":60.48518,"height":10625.84},{"longitude":-90.02708,"latitude":60.5532,"height":10625.97},{"longitude":-89.74967,"latitude":60.70626,"height":10626.24},{"longitude":-89.617,"latitude":60.77884,"height":10626.34},{"longitude":-87.30364,"latitude":61.97255,"height":10628.64},{"longitude":-59.43304,"latitude":68.13538,"height":10694.36},{"longitude":-59.06637,"latitude":68.17969,"height":10695.72},{"longitude":-58.69851,"latitude":68.22324,"height":10696.85},{"longitude":-58.32642,"latitude":68.26625,"height":10697.56},{"longitude":-57.95463,"latitude":68.30823,"height":10697.89},{"longitude":-57.58284,"latitude":68.34924,"height":10698.01},{"longitude":-57.21012,"latitude":68.38943,"height":10698.12},{"longitude":-56.83685,"latitude":68.42862,"height":10698.38},{"longitude":-56.46272,"latitude":68.46693,"height":10698.76},{"longitude":-56.08337,"latitude":68.50484,"height":10699.18},{"longitude":-55.70435,"latitude":68.54182,"height":10699.41},{"longitude":-55.31946,"latitude":68.57824,"height":10699.27},{"longitude":-54.92968,"latitude":68.61415,"height":10698.75},{"longitude":-54.5568,"latitude":68.64748,"height":10698.01},{"longitude":-54.16822,"latitude":68.6814,"height":10697.2},{"longitude":-53.78302,"latitude":68.71394,"height":10696.55},{"longitude":-53.39172,"latitude":68.7459,"height":10696.21},{"longitude":-52.99648,"latitude":68.77739,"height":10696.22},{"longitude":-52.60954,"latitude":68.80714,"height":10696.5},{"longitude":-52.21953,"latitude":68.83614,"height":10696.91},{"longitude":-51.83844,"latitude":68.86361,"height":10697.44},{"longitude":-51.44309,"latitude":68.89105,"height":10698.12},{"longitude":-51.04564,"latitude":68.91775,"height":10698.95},{"longitude":-50.65205,"latitude":68.94307,"height":10699.93},{"longitude":-50.26114,"latitude":68.96736,"height":10700.99},{"longitude":-49.862,"latitude":68.9873,"height":10702.1},{"longitude":-49.45413,"latitude":68.99833,"height":10703.2},{"longitude":-49.04689,"latitude":69.00851,"height":10704.25},{"longitude":-48.65419,"latitude":69.01737,"height":10705.2},{"longitude":-48.29727,"latitude":69.02459,"height":10706.04},{"longitude":-29.1449,"latitude":67.84658,"height":11341.65},{"longitude":-28.98855,"latitude":67.82117,"height":11341.68},{"longitude":-28.52525,"latitude":67.74468,"height":11341.68},{"longitude":-28.04757,"latitude":67.66386,"height":11341.81},{"longitude":-27.71401,"latitude":67.60634,"height":11342.03},{"longitude":-27.37356,"latitude":67.54655,"height":11342.31},{"longitude":-27.0469,"latitude":67.48827,"height":11342.56},{"longitude":-26.72125,"latitude":67.42923,"height":11342.67},{"longitude":-26.39715,"latitude":67.36942,"height":11342.64},{"longitude":-26.07518,"latitude":67.30913,"height":11342.52},{"longitude":-25.7552,"latitude":67.24829,"height":11342.39},{"longitude":-25.49839,"latitude":67.19872,"height":11342.44},{"longitude":-25.02888,"latitude":67.10655,"height":11342.85},{"longitude":-24.71243,"latitude":67.04324,"height":11343.37},{"longitude":-24.39717,"latitude":66.97925,"height":11343.99},{"longitude":-24.08335,"latitude":66.91452,"height":11344.62},{"longitude":-23.77346,"latitude":66.84965,"height":11345.14},{"longitude":-23.46293,"latitude":66.78374,"height":11345.54},{"longitude":-23.15693,"latitude":66.71787,"height":11345.83},{"longitude":-22.84894,"latitude":66.65057,"height":11346.07},{"longitude":-22.54657,"latitude":66.58357,"height":11346.3},{"longitude":-22.24051,"latitude":66.51475,"height":11346.53},{"longitude":-21.94095,"latitude":66.44648,"height":11346.77},{"longitude":-21.64486,"latitude":66.37798,"height":11347},{"longitude":-21.34827,"latitude":66.30853,"height":11347.2},{"longitude":-21.05129,"latitude":66.23799,"height":11347.38},{"longitude":-20.76073,"latitude":66.168,"height":11347.56},{"longitude":-20.46514,"latitude":66.09585,"height":11347.79},{"longitude":-20.17269,"latitude":66.02355,"height":11348.04},{"longitude":-19.8698,"latitude":65.9599,"height":11348.29},{"longitude":-19.54587,"latitude":65.91103,"height":11348.51},{"longitude":-19.22667,"latitude":65.86047,"height":11348.73},{"longitude":-18.90771,"latitude":65.8089,"height":11348.91},{"longitude":-18.5854,"latitude":65.75574,"height":11349.05},{"longitude":-18.26923,"latitude":65.70277,"height":11349.11},{"longitude":-17.94079,"latitude":65.64685,"height":11349.12},{"longitude":-17.62601,"latitude":65.59234,"height":11349.1},{"longitude":-17.31125,"latitude":65.53702,"height":11349.04},{"longitude":-16.99459,"latitude":65.48039,"height":11348.95},{"longitude":-16.68549,"latitude":65.42427,"height":11348.86},{"longitude":-16.37524,"latitude":65.36705,"height":11348.81},{"longitude":-16.07058,"latitude":65.31001,"height":11348.81},{"longitude":-15.76197,"latitude":65.25128,"height":11348.82},{"longitude":-15.45353,"latitude":65.19176,"height":11348.76},{"longitude":-15.1474,"latitude":65.1318,"height":11348.59},{"longitude":-14.84413,"latitude":65.07147,"height":11348.29},{"longitude":-14.5448,"latitude":65.01105,"height":11347.88},{"longitude":-14.23416,"latitude":64.9474,"height":11347.31},{"longitude":-13.92803,"latitude":64.88374,"height":11346.75},{"longitude":-13.63037,"latitude":64.82101,"height":11346.29},{"longitude":-13.33048,"latitude":64.75685,"height":11345.94},{"longitude":-13.03505,"latitude":64.69281,"height":11345.71},{"longitude":-12.74288,"latitude":64.62856,"height":11345.56},{"longitude":-12.4541,"latitude":64.56418,"height":11345.46},{"longitude":-12.16604,"latitude":64.49899,"height":11345.34},{"longitude":-11.86913,"latitude":64.43105,"height":11345.14},{"longitude":-11.61442,"latitude":64.37192,"height":11344.91},{"longitude":-10.65684,"latitude":64.14345,"height":11343.62},{"longitude":-10.36856,"latitude":64.07259,"height":11343.14},{"longitude":-10.08732,"latitude":64.00272,"height":11342.68},{"longitude":-9.80299,"latitude":63.93689,"height":11342.26},{"longitude":-9.51532,"latitude":63.87328,"height":11341.9},{"longitude":-9.2317,"latitude":63.80892,"height":11341.63},{"longitude":-8.94171,"latitude":63.74226,"height":11341.42},{"longitude":-8.68986,"latitude":63.68351,"height":11341.25},{"longitude":-8.68986,"latitude":63.68351,"height":11341.25},{"longitude":-8.68986,"latitude":63.68351,"height":11341.25},{"longitude":-7.92336,"latitude":63.50079,"height":11340.42},{"longitude":-7.64275,"latitude":63.43227,"height":11339.93},{"longitude":-7.3626,"latitude":63.36295,"height":11339.44},{"longitude":-7.07893,"latitude":63.29186,"height":11338.96},{"longitude":-6.79746,"latitude":63.22041,"height":11338.59},{"longitude":-6.51996,"latitude":63.14909,"height":11338.35},{"longitude":-6.2396,"latitude":63.07619,"height":11338.19},{"longitude":-5.96405,"latitude":63.00343,"height":11338.03},{"longitude":-5.68573,"latitude":62.92918,"height":11337.78},{"longitude":-5.41433,"latitude":62.8559,"height":11337.48},{"longitude":-5.14192,"latitude":62.78137,"height":11337.16},{"longitude":-4.87172,"latitude":62.70662,"height":11336.81},{"longitude":-4.59666,"latitude":62.62958,"height":11336.46},{"longitude":-4.32555,"latitude":62.55266,"height":11336.15},{"longitude":-4.05406,"latitude":62.47478,"height":11335.77},{"longitude":-3.78426,"latitude":62.39643,"height":11335.2},{"longitude":-3.51362,"latitude":62.31692,"height":11334.51},{"longitude":-3.23642,"latitude":62.23443,"height":11333.7},{"longitude":-2.95807,"latitude":62.15054,"height":11332.93},{"longitude":-2.68351,"latitude":62.0668,"height":11332.33},{"longitude":-2.40287,"latitude":61.98033,"height":11331.99},{"longitude":-2.12929,"latitude":61.89487,"height":11332.02},{"longitude":-1.85286,"latitude":61.80753,"height":11332.24},{"longitude":-1.58244,"latitude":61.72105,"height":11332.59},{"longitude":-1.29796,"latitude":61.629,"height":11332.95},{"longitude":-0.99897,"latitude":61.53575,"height":11333.24},{"longitude":-0.72598,"latitude":61.44937,"height":11333.32},{"longitude":-0.4629,"latitude":61.36505,"height":11333.18},{"longitude":-0.20344,"latitude":61.28091,"height":11332.86},{"longitude":0.06082,"latitude":61.19394,"height":11332.32},{"longitude":0.30075,"latitude":61.10381,"height":11331.7},{"longitude":0.55559,"latitude":61.00829,"height":11331.04},{"longitude":0.80816,"latitude":60.91292,"height":11330.49},{"longitude":1.05645,"latitude":60.81812,"height":11330.09},{"longitude":1.20163,"latitude":60.76212,"height":11329.93},{"longitude":1.55545,"latitude":60.62428,"height":11329.72},{"longitude":1.7891,"latitude":60.53211,"height":11329.61},{"longitude":2.11271,"latitude":60.40288,"height":11329.37},{"longitude":2.34208,"latitude":60.31018,"height":11329.1},{"longitude":2.58365,"latitude":60.2115,"height":11328.73},{"longitude":2.82178,"latitude":60.11334,"height":11328.3},{"longitude":3.05901,"latitude":60.01431,"height":11327.89},{"longitude":3.30066,"latitude":59.91238,"height":11327.52},{"longitude":3.54318,"latitude":59.80911,"height":11327.27},{"longitude":3.81699,"latitude":59.69128,"height":11327.18},{"longitude":4.04382,"latitude":59.59264,"height":11327.21},{"longitude":4.26781,"latitude":59.49413,"height":11327.28},{"longitude":4.48981,"latitude":59.39563,"height":11327.33},{"longitude":4.71266,"latitude":59.29577,"height":11327.27},{"longitude":4.9339,"latitude":59.19569,"height":11327.12},{"longitude":5.15121,"latitude":59.09647,"height":11326.93},{"longitude":5.369,"latitude":58.99593,"height":11326.76},{"longitude":5.58712,"latitude":58.89445,"height":11326.64},{"longitude":5.80106,"latitude":58.79399,"height":11326.63},{"longitude":6.01209,"latitude":58.69382,"height":11326.61},{"longitude":6.22302,"latitude":58.59279,"height":11326.54},{"longitude":6.43561,"latitude":58.49014,"height":11326.41},{"longitude":6.64318,"latitude":58.38904,"height":11326.06},{"longitude":6.85901,"latitude":58.28279,"height":11325.58},{"longitude":7.06518,"latitude":58.18048,"height":11325.08},{"longitude":7.33904,"latitude":58.04292,"height":11324.34},{"longitude":7.54349,"latitude":57.93929,"height":11323.87},{"longitude":7.75497,"latitude":57.83101,"height":11323.44},{"longitude":7.96483,"latitude":57.72258,"height":11323.05},{"longitude":8.21414,"latitude":57.59252,"height":11322.7},{"longitude":8.41748,"latitude":57.48535,"height":11322.44},{"longitude":8.61745,"latitude":57.3788,"height":11322.24},{"longitude":8.82158,"latitude":57.26926,"height":11322.04},{"longitude":8.97506,"latitude":57.19446,"height":11321.91},{"longitude":9.00507,"latitude":57.18388,"height":11321.88},{"longitude":9.26585,"latitude":57.09398,"height":10613},{"longitude":9.50849,"latitude":57.00964,"height":9820.32},{"longitude":9.78744,"latitude":56.91142,"height":9141.98},{"longitude":10.01519,"latitude":56.83041,"height":8555.11},{"longitude":10.23368,"latitude":56.75202,"height":8044.42},{"longitude":10.44206,"latitude":56.67646,"height":7510.89},{"longitude":10.6392,"latitude":56.6044,"height":6977.33},{"longitude":10.83072,"latitude":56.53383,"height":6359.92},{"longitude":11.00705,"latitude":56.4684,"height":5826.32},{"longitude":11.18348,"latitude":56.4025,"height":5368.92},{"longitude":11.27506,"latitude":56.36806,"height":5224.04},{"longitude":11.35806,"latitude":56.33677,"height":5223.95},{"longitude":11.43522,"latitude":56.30759,"height":5223.86},{"longitude":11.51525,"latitude":56.27714,"height":5200.91},{"longitude":11.6019,"latitude":56.2441,"height":4804.58},{"longitude":11.69271,"latitude":56.20927,"height":4347.29},{"longitude":11.77829,"latitude":56.17645,"height":4034.79},{"longitude":11.86415,"latitude":56.14343,"height":3806.12},{"longitude":11.94858,"latitude":56.11081,"height":3524.1},{"longitude":11.9781,"latitude":56.0994,"height":3394.53},{"longitude":12.00814,"latitude":56.08772,"height":3295.44},{"longitude":12.03852,"latitude":56.07591,"height":3196.35},{"longitude":12.06931,"latitude":56.06392,"height":3142.99},{"longitude":12.09844,"latitude":56.05261,"height":3120.1},{"longitude":12.12674,"latitude":56.04163,"height":3097.22},{"longitude":12.15362,"latitude":56.03114,"height":3074.33},{"longitude":12.18075,"latitude":56.02059,"height":3051.45},{"longitude":12.20744,"latitude":56.01016,"height":3028.56},{"longitude":12.23328,"latitude":56.00001,"height":2998.06},{"longitude":12.25825,"latitude":55.99019,"height":2944.7},{"longitude":12.28366,"latitude":55.98023,"height":2868.48},{"longitude":12.30761,"latitude":55.97082,"height":2746.55},{"longitude":12.33224,"latitude":55.96115,"height":2616.99},{"longitude":12.35754,"latitude":55.95117,"height":2472.19},{"longitude":12.38201,"latitude":55.94156,"height":2335.01},{"longitude":12.41163,"latitude":55.9299,"height":2190.21},{"longitude":12.43567,"latitude":55.92041,"height":2053.03},{"longitude":12.46058,"latitude":55.91052,"height":1938.7},{"longitude":12.48321,"latitude":55.90156,"height":1824.38},{"longitude":12.50836,"latitude":55.89155,"height":1694.82},{"longitude":12.53124,"latitude":55.88246,"height":1595.74},{"longitude":12.5542,"latitude":55.87334,"height":1504.28},{"longitude":12.56703,"latitude":55.86827,"height":1458.55},{"longitude":12.58939,"latitude":55.85938,"height":1351.85},{"longitude":12.60165,"latitude":55.85454,"height":1306.12},{"longitude":12.62398,"latitude":55.84569,"height":1214.66},{"longitude":12.63316,"latitude":55.84206,"height":1176.55},{"longitude":12.64551,"latitude":55.83714,"height":1130.81},{"longitude":12.66682,"latitude":55.82863,"height":1062.21},{"longitude":12.68605,"latitude":55.82094,"height":1016.47},{"longitude":12.70785,"latitude":55.81224,"height":955.49},{"longitude":12.72658,"latitude":55.80473,"height":924.99},{"longitude":12.73615,"latitude":55.80093,"height":902.12},{"longitude":12.74526,"latitude":55.79728,"height":871.63},{"longitude":12.76362,"latitude":55.78995,"height":841.13},{"longitude":12.77244,"latitude":55.78638,"height":818.26},{"longitude":12.78259,"latitude":55.78234,"height":795.39},{"longitude":12.80016,"latitude":55.7753,"height":734.41},{"longitude":12.80954,"latitude":55.77102,"height":703.92},{"longitude":12.81495,"latitude":55.7673,"height":673.43},{"longitude":12.82013,"latitude":55.76074,"height":642.94},{"longitude":12.81747,"latitude":55.7384,"height":612.43},{"longitude":12.8148,"latitude":55.73186,"height":597.19},{"longitude":12.81186,"latitude":55.72503,"height":597.18},{"longitude":12.80388,"latitude":55.71316,"height":597.17},{"longitude":12.78018,"latitude":55.69752,"height":581.93},{"longitude":12.77219,"latitude":55.69258,"height":536.21},{"longitude":12.7571,"latitude":55.68304,"height":475.24},{"longitude":12.75097,"latitude":55.67903,"height":429.52},{"longitude":12.727,"latitude":55.66365,"height":307.61},{"longitude":12.6853,"latitude":55.63683,"height":86.64},{"longitude":12.64044,"latitude":55.60784,"height":40.93},{"longitude":12.63927,"latitude":55.60707,"height":40.93},{"longitude":12.63853,"latitude":55.60685,"height":40.93},{"longitude":12.63777,"latitude":55.60692,"height":40.93},{"longitude":12.63715,"latitude":55.60722,"height":40.93},{"longitude":12.63595,"latitude":55.6083,"height":40.94},{"longitude":12.6364,"latitude":55.60869,"height":40.94},{"longitude":12.63698,"latitude":55.60918,"height":40.94},{"longitude":12.63788,"latitude":55.60994,"height":40.94},{"longitude":12.63842,"latitude":55.61042,"height":40.94},{"longitude":12.63904,"latitude":55.61097,"height":40.93},{"longitude":12.64046,"latitude":55.6122,"height":40.93},{"longitude":12.64114,"latitude":55.61282,"height":40.93},{"longitude":12.64187,"latitude":55.61343,"height":40.93},{"longitude":12.64267,"latitude":55.61413,"height":40.93},{"longitude":12.64345,"latitude":55.61482,"height":40.93},{"longitude":12.64487,"latitude":55.61603,"height":40.93},{"longitude":12.64535,"latitude":55.61645,"height":40.93},{"longitude":12.64568,"latitude":55.61689,"height":40.93},{"longitude":12.64554,"latitude":55.61756,"height":40.93},{"longitude":12.64539,"latitude":55.61799,"height":40.93},{"longitude":12.6452,"latitude":55.61862,"height":40.93},{"longitude":12.64503,"latitude":55.61921,"height":40.94},{"longitude":12.64507,"latitude":55.61959,"height":40.94},{"longitude":12.64531,"latitude":55.61997,"height":40.94},{"longitude":12.6457,"latitude":55.62033,"height":40.94},{"longitude":12.64616,"latitude":55.62074,"height":40.94},{"longitude":12.64662,"latitude":55.62112,"height":40.94},{"longitude":12.64732,"latitude":55.62171,"height":40.93},{"longitude":12.64784,"latitude":55.62218,"height":40.93},{"longitude":12.64791,"latitude":55.62269,"height":40.94},{"longitude":12.64786,"latitude":55.62305,"height":40.94},{"longitude":12.64782,"latitude":55.62333,"height":40.94},{"longitude":12.6478,"latitude":55.62367,"height":40.94},{"longitude":12.64776,"latitude":55.62396,"height":40.94},{"longitude":12.64774,"latitude":55.62442,"height":40.94},{"longitude":12.64774,"latitude":55.62472,"height":40.94},{"longitude":12.64788,"latitude":55.62494,"height":40.94},{"longitude":12.6483,"latitude":55.62496,"height":40.94},{"longitude":12.64852,"latitude":55.62494,"height":40.94},{"longitude":12.64878,"latitude":55.62493,"height":40.94},{"longitude":12.64904,"latitude":55.62492,"height":40.94},{"longitude":12.64928,"latitude":55.62491,"height":40.94},{"longitude":12.64936,"latitude":55.6249,"height":40.94},{"longitude":12.64949,"latitude":55.62442,"height":40.94},{"longitude":12.64936,"latitude":55.6247,"height":40.94}]'    );    /* Initialize the viewer clock:      Assume the radar samples are 30 seconds apart, and calculate the entire flight duration based on that assumption.      Get the start and stop date times of the flight, where the start is the known flight departure time (converted from PST         to UTC) and the stop is the start plus the calculated duration. (Note that Cesium uses Julian dates. See         https://simple.wikipedia.org/wiki/Julian_day.)      Initialize the viewer's clock by setting its start and stop to the flight start and stop times we just calculated.       Also, set the viewer's current time to the start time and take the user to that time.     */    const timeStepInSeconds = 30;    const totalSeconds = timeStepInSeconds * (flightData.length - 1);    const start = Cesium.JulianDate.fromIso8601("2020-03-09T23:10:00Z");    const stop = Cesium.JulianDate.addSeconds(start, totalSeconds, new Cesium.JulianDate());    viewer.clock.startTime = start.clone();    viewer.clock.stopTime = stop.clone();    viewer.clock.currentTime = start.clone();    viewer.timeline.zoomTo(start, stop);    // Speed up the playback speed 50x.    viewer.clock.multiplier = 50;    // Start playing the scene.    viewer.clock.shouldAnimate = true;    // The SampledPositionedProperty stores the position and timestamp for each sample along the radar sample series.    const positionProperty = new Cesium.SampledPositionProperty();    for (let i = 0; i < flightData.length; i++) {      const dataPoint = flightData[i];      // Declare the time for this individual sample and store it in a new JulianDate instance.      const time = Cesium.JulianDate.addSeconds(start, i * timeStepInSeconds, new Cesium.JulianDate());      const position = Cesium.Cartesian3.fromDegrees(dataPoint.longitude, dataPoint.latitude, dataPoint.height);      // Store the position along with its timestamp.      // Here we add the positions all upfront, but these can be added at run-time as samples are received from a server.      positionProperty.addSample(time, position);      viewer.entities.add({        description: `Location: (${dataPoint.longitude}, ${dataPoint.latitude}, ${dataPoint.height})`,        position: position,        point: { pixelSize: 10, color: Cesium.Color.RED }      });    }    // STEP 6 CODE (airplane entity)    async function loadModel() {      // Load the glTF model from Cesium ion.      const airplaneUri = await Cesium.IonResource.fromAssetId(your_asset_id);      const airplaneEntity = viewer.entities.add({        availability: new Cesium.TimeIntervalCollection([ new Cesium.TimeInterval({ start: start, stop: stop }) ]),        position: positionProperty,        // Attach the 3D model instead of the green point.        model: { uri: airplaneUri },        // Automatically compute the orientation from the position.        orientation: new Cesium.VelocityOrientationProperty(positionProperty),            path: new Cesium.PathGraphics({ width: 3 })      });            viewer.trackedEntity = airplaneEntity;    }    loadModel();  </script></body></html>
复制代码


参考链接:


https://cesium.com/learn/cesiumjs-learn/cesiumjs-flight-tracker/


https://www.flightradar24.com/how-it-works


2022 年 8 月 03 日 15:382114
用户头像
刘燕 InfoQ 编辑

发布了 878 篇内容, 共 300.9 次阅读, 收获喜欢 1653 次。

关注

评论 1 条评论

发布
用户头像
印度、中国、台湾、日本....??
小编打瞌睡呢
12 小时前
回复
没有更多了

第七周

Geek_fabd84

架构师训练营第七周学习总结

Gosling

极客大学架构师训练营

把打胜仗的决心作为信仰

吴晨曦

创业

架构师训练营—第七周作业

Geek_shu1988

Week3-面向对象的设计模式(作业一)

shuyaxx

Navicat无法连接MySQL怎么办?

MySQL从删库到跑路

MySQL navicat 3306端口

架构师训练营第 1 期 -第七周作业

睁眼看世界

极客大学架构师训练营

架构一期第七周作业

Airs

作业-第3周总结

arcyao

第七周作业

icydolphin

极客大学架构师训练营

第三周作业

孤星

架构师训练营 - 第七周作业

一个节点

极客大学架构师训练营

架构师训练营第三周作业

Sandman

架构师训练营 - 第七周总结

一个节点

极客大学架构师训练营

Week3作业一

幸福小子

单例模式

Week3- 面向对象的设计模式(作业二)

shuyaxx

Week3总结

lggl

作业

架构师训练营第 1 期第七周总结

Leo乐

极客大学架构师训练营

架构师训练营—第七周学习总结

Geek_shu1988

极客大学架构师训练营

性能优化一第七周作业「架构师训练营第 1 期」

天天向善

性能测试中并发量与响应时间和吞吐量的关系

天天向上

极客大学架构师训练营

week07作业

追风

架构师一期

架构师训练营第 1 期第七周作业

Leo乐

极客大学架构师训练营

架构师训练营1期 第七周总结

谭明华

第三章总结

孤星

Week3小结

幸福小子

设计模式

架构师训练营第七周课程笔记及心得

Airs

第七周作业

Geek_ce484f

极客大学架构师训练营

架构师训练营1期 第七周作业

谭明华

极客大学架构师训练营

第三章课后作业

博博

第三章学习笔记

博博

“霍太稳”视频号来了

你好,我是霍太稳,InfoQ 中国创始人。
在这里,我会和技术大咖深度对谈、解读行业发展趋势也会聊个人成长、职场发展。
你也能通过视频号跟我直接交流。

微信扫码关注,你想要的我都有!

昨晚,累计292万人紧盯Flightradar24网站,航班跟踪的技术原理是什么?_大数据_刘燕_InfoQ精选文章