前言

往往好多事情是需求推动的，正好一个网友在群里问到”怎么让Cesium加载GeoJSON的白膜并贴在地形上？“，联系到他，要了他的数据，完成了代码并测试通过。正好出差，而且一个人工作之余无事（加之西宁不知咋搞的，宾馆旁的市政作业挖掘机22:35还不歇息，可谓是惊天动地啊），通过从数据的获取到加载进行研究并作出记录，希望能帮到更多的人！

1. QGIS离线GeoJSON白膜数据
《QGIS离线数据或瓦片并使用Cesium调用离线瓦片》已经写了相关内容，可惜当时未导出GeoJSON数据，此次基本按照当时得操作步骤进行数据离线。将重要数据作为记录。

  • 打开OpenStreetMap，框选下载数据，移除相关不相关数据


  • 将其导出为GeoJSON
  • 移除非相关的面状要素，右键Toggle Editing,删除院子等面状要素，然后save
  • 添加楼层floor字段，并编辑所有数据，至此制作完成

2. Cesium加载并根据楼层高度拉伸

  • 代码
<!DOCTYPE html>
<html lang="en"><head><meta charset="utf-8" /><meta name="viewport" content="width=device-width, initial-scale=1" /><meta name="theme-color" content="#000000" /><link href="../../Cesium/Widgets/widgets.css" rel="stylesheet"><script type="text/javascript" src="../../Cesium/Cesium.js"></script><script src="../config.js"></script><title>building</title>
</head><body style="margin: 0px;width:100%;height:100%;"><div id="cesiumContainer" style="width:100%;height:100%;position:absolute;"></div>
</body>
<script>//created by onegiser at 2021-10-25const key='天地图key'const viewer = new Cesium.Viewer('cesiumContainer', {imageryProviderViewModels: [new Cesium.ProviderViewModel({name: "天地图影像",iconUrl: "/imgs/map/tdt_img.jpg",creationFunction: () => {const imgImageryProvider = new Cesium.WebMapTileServiceImageryProvider({url: 'http://t{s}.tianditu.gov.cn/img_w/wmts?SERVICE=WMTS&REQUEST=GetTile&VERSION=1.0.0&LAYER=img&STYLE=default&TILEMATRIXSET=w&FORMAT=tiles&TILEMATRIX={TileMatrix}&TILEROW={TileRow}&TILECOL={TileCol}&tk='+key,layer: 'img_w',style: 'default',format: 'tiles',tileMatrixSetID: 'GoogleMapsCompatible',subdomains: ['0', '1', '2', '3', '4', '5', '6', '7'],minimumLevel: 0,maximumLevel: 18})return [imgImageryProvider]}})],terrainProvider: new Cesium.CesiumTerrainProvider({url: 'https://www.supermapol.com/realspace/services/3D-stk_terrain/rest/realspace/datas/info/data/path',invisibility: true})})const promise = Cesium.GeoJsonDataSource.load('../datas/jzw.geojson')promise.then((dataSource) => {const entities = dataSource.entities.values;for (let i = 0; i < entities.length; i++) {const entity = entities[i];const { properties, polygon } = entitylet extrudedHeight = 300if (properties && properties.floor._value) {extrudedHeight = properties.floor._value * 3}let color = "#fff2cc"if (extrudedHeight <= 50) {color = "#FFFACD"} else if (extrudedHeight <= 100) {color = "#CAE1FF"} else if (extrudedHeight <= 300) {color = "#CD6839"}entity.polygon = new Cesium.PolygonGraphics({hierarchy: polygon.hierarchy,heightReference: Cesium.HeightReference.CLAMP_TO_GROUND,extrudedHeight,material: Cesium.Color.fromCssColorString(color),})viewer.entities.add(entity)}})const x = 103.8768888, y = 36.0348739viewer.camera.flyTo({destination: Cesium.Cartesian3.fromDegrees(x, y, 3000),});</script></html>
  • 效果示意图

  1. 附数据内容
{"type": "FeatureCollection",
"name": "jzw",
"crs": { "type": "name", "properties": { "name": "urn:ogc:def:crs:OGC:1.3:CRS84" } },
"features": [
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