[GRASS-user] raster analysis: hot to get one <elevation
raster> from two elevation rasters?
Nikos Alexandris
nikos.alexandris at felis.uni-freiburg.de
Tue May 27 08:14:05 EDT 2008
On Tue, 2008-05-27 at 12:05 +0000, christian Brandt wrote:
> What I want to do is to get just one <elevation-raster> with combined
> elevation data from DGM raster and buildings raster
>
> Hence I tried the r.mapcalculator as follows:
> r.mapcalculator amap=dgm bmap=geb formula=A+B outfile=dgm_geb
Dear Christian,
r.mapcalc or r.mapcalculator should work.
Just some ideas (which you might have tested already, but anyway... ):
1. check the range of your "dgm" and "geb" data to be sure that both
have "valid" values
r.info -r dgm
r.info -r geb
(or use r.describe to list all values contained in your maps)
2. check the computational extent in you LOCATION:
g.region -p
or why not set directly to match the extent of one of your maps:
g.region rast=dgm
Nikos
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