[GRASS-user] cutting issue (again): r.mapcalc vs. r.resample
rshepard at appl-ecosys.com
Mon Jan 25 18:10:07 EST 2010
On Mon, 25 Jan 2010, Tim Michelsen wrote:
> I while ago I asked how to cut a small map from a larger one using the
> region settings as boundary for the small map:
> I tried this again:
> Approach 1: r.mapcalc
> Approach 2: r.resample
> Am I doing something wrong?
Looks like it.
I asked for guidance on doing just what you need to do: cut out the
project area from a larger DEM.
The approach that worked for me was described by Helmut Kudrnovsky:
1) zoom to your area of interest of your larger region.
2) v.in.region e.g. "v.in.region output=testarea", so the extent of your
area of interest is defined by the vector "testarea"
3) "g.region vect=testarea", by this the region is set to your area of
interest for analysis. "This region defines the geographic area in which
all GRASS displays and raster analyses will be done."
Works like a charm.
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