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I would like to compare NOAA GFS (Global Forecast System) geopotential height from ASL and GTOPO30.

However, I cannot find vertical offset information in GFS geopotential height. Does anyone know where it is located?
(And, I assume that GTOPO30 is in the geometric height from ASL ... is that correct?)

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I have found the answer

Geopotential height of ground or water surface is available as a variable (UCAR variable inventory). It is called 'orography' if you read the file with cfgrib. Somehow it did not appear in variable inventory when read with pygrib ...

Alternatively, I could have used MetPy.

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