Elevation errors

Please help me get the elevation correct for my polyline.

In recognition that there is a discrepancy in height data between my source data and Cesium's terrain, I am retrieving new height data from a sampleTerrain command....

viewer.terrainProvider = new Cesium.CesiumTerrainProvider({url : '//assets.agi.com/stk-terrain/world'});


var promise = Cesium.sampleTerrain(viewer.terrainProvider, 11, newEle);

(newEle is an array of data points [height, latitude, longitude)

However when a polyline populated with the new elevation for the same lat & lon is lain onto the terrain there is still a difference, sometimes greater than terrain, sometimes less than terrain height.

This is my development project showing the differences...


In particular between 0900 and 0910 hrs UTC you can see the variances clearly.

With thanks


It looks like you’re on the right track. Try sampling a higher level of the terrain.