Combine several terrain providers

[dzung]

There was a similar question and the suggestion was to merge the terrain when you upload them to ion:

load multiple terrain providers.

How to load multiple dtm datasets on cesium map using asset ids .something like var viewer = new Cesium.Viewer('cesiumContainer',{ terrainProvider : new Cesium.CesiumTerrainProvider({ url: Cesium.IonResource.fromAssetId(6015,6011,6012) }) }); ``