I have resolved with: r.walk -k elevation=your_dtm friction=your_friction output=*walkout*start_points=A stop_points=B
afterwards r.drain -c input=*walkout* output=drainout vector_points=B perhaps it is need a filling of the dtm and also of walkout map in order to avoid aq loop effect All the best, Roberto 2012/2/7 Moritz Lennert <[email protected]> > On 07/02/12 14:39, ALT SHN wrote: > >> Hello list, >> >> I have a raster obtained through r.mapcalc whose cells values represent >> friction or cost. >> > > I suppose that is friction per cell. > > > To finish my study I'm lacking one final step - calculate the least cost >> path! >> >> How do I do it? I've tried r.cost but the result is not wat I expected - >> My desired output is just a line from A to B, crossing the least valued >> cells. >> > > Use r.cost with the coordinate of (or the vector or raster file > containing) A as start point. Then r.drain with B as starting point. > > Moritz > ______________________________**_________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/**mailman/listinfo/grass-user<http://lists.osgeo.org/mailman/listinfo/grass-user> >
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