[GRASS-user] r.mapcalc and the neighborhood modifier

Hanan Karam HananKaram at esinternational.com
Tue Jul 16 10:03:27 PDT 2013

Hi Rainer,

I had a similar problem recently.
I was working with 8 unique flow directions, and I created a separate map for each flow direction. Something like this...
r.mapcalc expression="flowdir1_dispersal = if(flowdir=1, seeds[xoffset_1,yoffset_1], null())"
r.mapcalc expression="flowdir2_dispersal= if(flowdir=2, seeds[xoffset_2,yoffset_2], null())"

Then, patch the different maps using r.patch.

I hope this is helpful.


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