1. 引言
Cesium是一款三维地球和地图可视化开源JavaScript库,使用WebGL来进行硬件加速图形,使用时不需要任何插件支持,基于Apache2.0许可的开源程序,可以免费用于商业和非商业用途
Cesium官网:Cesium: The Platform for 3D Geospatial
Cesium GitHub站点:CesiumGS/cesium: An open-source JavaScript library for world-class 3D globes and maps (github.com)
API文档:Index - Cesium Documentation
本文描述Cesium的影像底图加载
2. 影像底图加载
2.1 Cesium的影像图层
Cesium中的影像图层位于viewer.imageryLayers
下,可以对其进行添加、删除影像图层操作
参考官方API文档:Viewer - Cesium Documentation
可以发现Viewer
包含imageryLayers
(ImageryLayerCollection类型),imageryLayers
由imageryLayer
构成,可以对imageryLayers
进行添加、删除imageryLayer
的操作。imageryLayer
的构造函数为:new Cesium.ImageryLayer(imageryProvider, options),而Cesium支持的imageryProvider
包含以下:
- ArcGisMapServerImageryProvider
- BingMapsImageryProvider
- OpenStreetMapImageryProvider
- TileMapServiceImageryProvider
- GoogleEarthEnterpriseImageryProvider
- GoogleEarthEnterpriseMapsProvider
- GridImageryProvider
- IonImageryProvider
- MapboxImageryProvider
- MapboxStyleImageryProvider
- SingleTileImageryProvider
- TileCoordinatesImageryProvider
- UrlTemplateImageryProvider
- WebMapServiceImageryProvider
- WebMapTileServiceImageryProvider
即,Cesium主要支持ArcGIS、Bing、OSM、Google、Mapbox等的地图服务和OGC标准的WMS、WMTS地图服务
2.2 添加第三方服务
这里的第三方地图服务主要是指ArcGIS、Bing、OSM、Google、Mapbox的地图服务
主要步骤为选择并构造相应的imageryProvider,然后构造为imageryLayer,最后add到viewer中(也可以直接viewer.imageryLayers.addImageryProvider(provider))
这里加载的是ESRI提供的地图,地址为:https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
html,
body,
#cesiumContainer {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
</style>
<!-- Include the CesiumJS JavaScript and CSS files -->
<script src="https://cesium.com/downloads/cesiumjs/releases/1.101/Build/Cesium/Cesium.js"></script>
<link href="https://cesium.com/downloads/cesiumjs/releases/1.101/Build/Cesium/Widgets/widgets.css" rel="stylesheet">
</head>
<body>
<div id="cesiumContainer"></div>
<script>
Cesium.Ion.defaultAccessToken = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiJlMTk4ZTYyNy00MjkxLTRmZWYtOTg1MS0wOThjM2YzMzIzYzEiLCJpZCI6NzEyMSwic2NvcGVzIjpbImFzciIsImdjIl0sImlhdCI6MTU0ODMxNzI5OX0.rKV8Ldl_bgR3lVvNsbHhTX62j8JH8ADCIWAwk7tXpr8'
const viewer = new Cesium.Viewer('cesiumContainer', {
timeline: false,
animation: false,
})
const provider = new Cesium.ArcGisMapServerImageryProvider({
url: 'https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer'
})
viewer.imageryLayers.addImageryProvider(provider)
</script>
</body>
</html>
2.3 添加OGC服务
OGC服务主要有WMS、WMTS等,是OGC联盟制定的标准
主要步骤和添加第三方地图服务类似,选择并构造相应的imageryProvider,然后构造为imageryLayer,最后add到viewer中(也可以直接viewer.imageryLayers.addImageryProvider(provider))
这里加载的是ahocevar.com提供的地图,地址为:https://ahocevar.com/geoserver/wms
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
html,
body,
#cesiumContainer {
width: 100%;
height: 100%;
margin: 0;
padding: 0;
overflow: hidden;
}
</style>
<!-- Include the CesiumJS JavaScript and CSS files -->
<script src="https://cesium.com/downloads/cesiumjs/releases/1.101/Build/Cesium/Cesium.js"></script>
<link href="https://cesium.com/downloads/cesiumjs/releases/1.101/Build/Cesium/Widgets/widgets.css" rel="stylesheet">
</head>
<body>
<div id="cesiumContainer"></div>
<script>
Cesium.Ion.defaultAccessToken = 'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiJlMTk4ZTYyNy00MjkxLTRmZWYtOTg1MS0wOThjM2YzMzIzYzEiLCJpZCI6NzEyMSwic2NvcGVzIjpbImFzciIsImdjIl0sImlhdCI6MTU0ODMxNzI5OX0.rKV8Ldl_bgR3lVvNsbHhTX62j8JH8ADCIWAwk7tXpr8'
const viewer = new Cesium.Viewer('cesiumContainer', {
timeline: false,
animation: false,
})
const provider = new Cesium.WebMapServiceImageryProvider({
url: "https://ahocevar.com/geoserver/wms",
layers: "topp:states",
parameters: {
transparent: true,
format: "image/png"
},
proxy: new Cesium.DefaultProxy('/proxy/')
})
viewer.imageryLayers.addImageryProvider(provider)
</script>
</body>
</html>
3. 参考资料
[1]Index - Cesium Documentation
[2][CesiumJS]Cesium入门6 - Adding Imagery - 添加图层 - Cesium中文网 (cesiumcn.org)
[3]Cesium多源数据加载之影像图层(一) - 知乎 (zhihu.com)
[4]Cesium教程系列汇总 - fu*k - 博客园 (cnblogs.com)
标签:底图,imageryLayers,viewer,provider,Cesium,new,com,加载 From: https://www.cnblogs.com/jiujiubashiyi/p/17091274.html