When I use GetMap on a raster layer of a WMS GeoServer, the color scale adjusts automatically, so the scale is relative to the retrieved content of the requested area.

How do I extract numerically the absolute altitude/elevation ?

Alternatively, is there a way to tell the WMS server (GeoServer) to provide the absolute values ?

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    Use a WCS to access real data, or configure WMS to give real data values through a GetFeatureInfo request – nmtoken Jul 15 '20 at 14:09
  • Indeed both WCS (for a subset of pixels) and WMS:GetFeatureInfo (for a single pixel) do the job, thanks. – Skippy le Grand Gourou Oct 6 '20 at 15:51