There used to be a perl script to generate map-calc code which might do what you are after.
Have a look at http://grass.gdf-hannover.de/wiki/GRASS_AddOns: - Local maxima <http://les-ejk.cz/files/programs/local_max.pl> is a Perl script for r.mapcalc. It detects local maxima of the image. *Author:* Jachym Cepicky *Usage:* local_maxima.pl -i input -o output -s matrix_size|r.mapcalc The link is stale, but the author is still alive, so he might have the code. HTH Ludwig
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