[GRASS-dev] r.shrink??

[Jarek Jasiewicz]

Michael Barton pisze:
> Am I missing something or is there no module that does the opposite of 
> r.grow (i.e., shrink rasters of a given category by 1 or more pixels)? 
> r.thin tries to thin to a line.
>
> Michael
> ____________________
> C. Michael Barton
> Director, Center for Social Dynamics & Complexity 
> Professor of Anthropology, School of Human Evolution & Social Change
> Arizona State University
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for that I use following mapcalc expression:

echo 'map=if(  isnull(map[-1,-1])||isnull(map[-1,0])|| \
isnull(map[-1,1])||isnull(map[0,-1])|| \
isnull(map[0,1])||isnull(map[1,-1])||isnull(map[1,0])|| \
isnull(map[1,1]), map,null())'| r.mapcalc

this work for me
Jarek