[GRASS-user] create a mask to exclude plate area

[Nikos Alexandris]

Etienne,

if the main difficulty is about how to combine two criteria in one "r.mapcalc" 
command, then,  I recommend to go through the r.mapcalc manual [1]. There are 
many examples. Also read the old (but very good) tutorial [2] (which is 
referenced in the manual).

Nikos

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[1] <http://grass.osgeo.org/grass64/manuals/html64_user/r.mapcalc.html>
[2] <http://grass.osgeo.org/gdp/raster/mapcalc-algebra.pdf>