<div dir="ltr">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....<br>
</div><div class="gmail_extra"><br><br><div class="gmail_quote">2013/4/5 Helmut Kudrnovsky <span dir="ltr"><<a href="mailto:hellik@web.de" target="_blank">hellik@web.de</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">> I wonder how I can merge 2 or more raster-DEMs i grass?<br>
<br>
</div>r.patch ?<br>
<br>
Creates a composite raster map layer by using known category values from one<br>
(or more) map layer(s) to fill in areas of "no data" in another map layer.<br>
<a href="http://grass.osgeo.org/grass64/manuals/r.patch.html" target="_blank">http://grass.osgeo.org/grass64/manuals/r.patch.html</a><br>
<br>
another nice way, build a gdal virtual dataset<br>
(<a href="http://www.gdal.org/gdal_vrttut.html" target="_blank">http://www.gdal.org/gdal_vrttut.html</a>) with 2 or more DEMs outside of<br>
qgis/grass and r.external (Link GDAL supported raster file to a binary<br>
raster map layer: <a href="http://grass.osgeo.org/grass64/manuals/r.external.html" target="_blank">http://grass.osgeo.org/grass64/manuals/r.external.html</a>) or<br>
r.in.gdal (Import GDAL supported raster file into a binary raster map layer:<br>
<a href="http://grass.osgeo.org/grass64/manuals/r.in.gdal.html" target="_blank">http://grass.osgeo.org/grass64/manuals/r.in.gdal.html</a>) the virtual raster.<br>
<br>
HTH<br>
<br>
<br>
<br>
-----<br>
best regards<br>
Helmut<br>
--<br>
View this message in context: <a href="http://osgeo-org.1560.n6.nabble.com/merge-2-ascii-DEM-grass-DEM-tp5044871p5044897.html" target="_blank">http://osgeo-org.1560.n6.nabble.com/merge-2-ascii-DEM-grass-DEM-tp5044871p5044897.html</a><br>
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</blockquote></div><br></div>