提示：如果是天地图底图参考这篇文章
【一】arcgis JavaScript api 实现加载不同坐标系的底图和三维服务_arcgis js api 调用三维地图服务-CSDN博客
需求：
前端开发实现底图（wkid：3857，web墨卡托），高程服务（wkid：3857，web墨卡托）和不同坐标系的三维服务（wkid：4490，cgcs2000）套合
二三维地图服务现状：
栅格切片服务：3857
影像切片服务：3857
高程服务：3857
三维服务：4490
思路：
- 原有栅格切片服务，可以发布一个空的3857的影像切片服务，然后复用切片；
- 影像切片服务都在新环境下采用imagetilelayer的方式，可以直接支持3857的栅格切片服务和影像切片服务与4490的三维服务套合，在global和local场景下都能加载，
- 高程服务由于是dem数据发布的，需要重新将dem转成4490坐标系重切。
最终效果：
实现代码
<!DOCTYPE html>
<html><head><meta charset="utf-8" /><metaname="viewport"content="initial-scale=1,maximum-scale=1,user-scalable=no"/><title>IntegratedMeshLayer - 4.27</title><linkrel="stylesheet"href="https://js.arcgis.com/4.26/esri/themes/light/main.css"/><script src="https://js.arcgis.com/4.26/"></script><style>html,body,#viewDiv {padding: 0;margin: 0;height: 100%;width: 100%;}</style><script>require(["esri/Map","esri/views/SceneView","esri/layers/IntegratedMeshLayer","esri/layers/ImageryTileLayer","esri/Basemap","esri/Ground","esri/layers/ElevationLayer","esri/geometry/SpatialReference",], function (Map,SceneView,IntegratedMeshLayer,ImageryTileLayer,Basemap,Ground,ElevationLayer, SpatialReference) {const spatialReference = new SpatialReference({wkid: 4490});//定义业务图层，例如：倾斜模型服务var layer = new IntegratedMeshLayer({url: "https://ncportal.geoscene.cn/server/rest/services/Hosted/nanning4490/SceneServer",});const tilelayer = new ImageryTileLayer({url: "https://ncportal.geoscene.cn/server/rest/services/nanning3857image/ImageServer",});//定义高程表面var customElevation = new ElevationLayer({url: "https://ncportal.geoscene.cn/server/rest/services/nanningelevation4490/ImageServer",});var customeGround = new Ground({layers: [customElevation],});//定义底图let basemap = new Basemap({baseLayers: tilelayer,});var map = new Map({layers: [layer], //业务图层basemap: basemap, //底图ground: customeGround, //高程表面});var view = new SceneView({container: "viewDiv",map: map,qualityProfile: "high",spatialReference:spatialReference});view.when(function () {view.qualitySettings.memoryLimit = 4096; //20190722 修改内存大小。view.goTo(tilelayer.fullExtent);});});</script></head><body><div id="viewDiv"></div></body>
</html>
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