[GRASS-user] merge 2 ascii-DEM/grass-DEM

[Helmut Kudrnovsky]

> I wonder how I can merge 2 or more raster-DEMs i grass?

r.patch ?

Creates a composite raster map layer by using known category values from one
(or more) map layer(s) to fill in areas of "no data" in another map layer. 
http://grass.osgeo.org/grass64/manuals/r.patch.html

another nice way, build a gdal virtual dataset
(http://www.gdal.org/gdal_vrttut.html) with 2 or more DEMs outside of
qgis/grass and r.external (Link GDAL supported raster file to a binary
raster map layer: http://grass.osgeo.org/grass64/manuals/r.external.html) or
r.in.gdal (Import GDAL supported raster file into a binary raster map layer:
http://grass.osgeo.org/grass64/manuals/r.in.gdal.html) the virtual raster.

HTH



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best regards
Helmut
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