My ASTER GDEM2 has a average elevation error of -10m for my area. (I testet it using 90 defferential GPS reference points and compared it with old Topo25, SRTM, and GoogleMaps).
I would like to correct it by +10m for every pixel. Any idea? Whats the reason for that "error"? It is measured at a different height reference?
Answer
This is a job for the Raster Calculator, it's under the Raster menu (don't confuse this with RasterCalc!). The expression:
snowdon_dem.tif@1 + 10
will do this, where 'snowdon_dem.tif@1' is the name of the original DEM. You can also find additional informations here.
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