Werid Elevation from .terrain files

CesiumJS
1

Screenshot from 2026-03-16 12-55-54
Screenshot from 2026-03-16 12-55-541103×590 167 KB

i have dsm.tif from which i do gdalwarp to epsg 4326 then i use ctb to convert them to quantized mesh format i have tiles from tileserver for which i use gdal2tiles to convert it into tiles there is --project epsg:3857 so what is the unwanted elevation in case of terrain??

2

Hi @Haadi_M1 ,

The area around the image is rather flat so it’s hard to tell, the elevated portion is tiled into an existing terrain dataset? Or is the elevated part the only file that was converted to quantized mesh?

If the elevated part is added into terrain, one possibility is that since epsg:3857 uses a spherical projection, it might cause elevation changes at certain distances.

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Hey @Haadi_M1 ,

Looks like this is a duplicate of your previous post here. I appreciate that your post had not been responded to, but to keep the forum tidy and make things easier for other users to find, you can reply to your previous topic in the same thread to add any extra information or “bump” the topic to the topic so we can reply.

Thanks for your patience

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I faced the same issue earlier. One possible reason is that your DEM doesn’t fully cover the area, and the regions outside contain NoData values, which can cause flat terrain.

One workaround that worked for me:

  • Load the DEM into QGIS

  • Assign a valid elevation value to the NoData areas (instead of leaving them empty)

  • Export the raster again

  • Then regenerate the tiles

After doing this, the terrain rendered correctly in Cesium for unreal.