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

Johan Nilsson joni8135 at gmail.com
Fri Apr 5 10:37:11 PDT 2013

I think my terminology are bad. The DEMs are over different areas beside
each other, but within the mapset and location, so 'merge' are maybe not
the right terminology? Or maybe there are another way? But when I load into
NVIZ I can only chose one layer, DEMs in the mapset listed....

2013/4/5 Helmut Kudrnovsky <hellik at web.de>

> > 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.
> -----
> best regards
> Helmut
> --
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