arcgis api 添加三维模型

要么在桌面软件（arcgispro）中利用move to工具调整模型的z高度为0，要么将场景服务加载到webscene中，在webscene中调整模型绝对高度的偏移值，然后在前端中直接加载这个webscene。

自己把高程数据，发布成高程影像服务，然后加载到map中看看是否可行：
 
// Create a map with the world elevation layer overlaid by a custom elevation layer
const worldElevation = ElevationLayer({
  url: "//elevation3d.arcgis.com/arcgis/rest/services/WorldElevation3D/Terrain3D/ImageServer"
});
const customElevation = ElevationLayer({
  url: "https://my.server.com/arcgis/r ... ot%3B
});
const map = new Map({
  basemap: "topo-vector",
  ground: new Ground({
   layers: [ worldElevation, customElevation ]
  })
});
https://developers.arcgis.com/javascript/latest/api-reference/esri-WebScene.html 
 
https://developers.arcgis.com/javascript/latest/sample-code/sandbox/index.html?sample=layers-scenelayer