[GRASS-user] tiling and 'cliping' DEMs

Rich Shepard rshepard at appl-ecosys.com
Wed Sep 11 06:03:54 PDT 2019

On Tue, 10 Sep 2019, Helmut Kudrnovsky wrote:

> To save diskspace,, build a virtual raster with your tiles outside GRASS
> by GDAL's buildvrt, do r.external yourvirtual.vrt.
> No import is needed for raster calculations, r.external to link the virtual
> raster works nicely..
> regarding to clip a raster to  vector extent, there a several ways. One may
> be: g.region  -a raster=yourraster vector=yourvector followed by a r.mask
> vector=yourvector then r.mapcal clippedraster=yourraster


This is exceptionally useful information. I've not looked closely at gdal
and don't know all its capabilities. Perhaps this could be added to the Wiki
as it's likely to be useful to others.

I greatly appreciate the lesson.

Best regards,


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