[GRASS-user] cutting issue (again): r.mapcalc vs. r.resample
timmichelsen at gmx-topmail.de
Mon Jan 25 17:31:33 EST 2010
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
r.mapcalc "cut=if(boundary_raster, large_map,
Approach 2: r.resample
r.resample input=large_map output=cut
I notice the that using Approach 2, the areas that was outside the set
region is white. The underlayung rasters are not visible (or only if I
set the opacity of "cut" to a low value).
If I use Approach 1 with r.mapcalc, the areas outside the region are
really NULL() (=transparent) and underlaying larger rasters are visible.
Only that the result "cut" from r.mapcalc has a new colortable.
Am I doing something wrong?
Why is the no such command r.cut?
Thanks in advance for your help,
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