@ Roberto Thank you for the hint. It's a nice way arround for a future purpose.
The friction map I am using was build from various inputs, one of them the DEM (slope). So, if I understood right, using r.walk would be redundant beacause slope and altitude are already considered in the friction map. Best Regards, André 2012/2/8 Roberto Marzocchi <roberto.marzoc...@gmail.com> > 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 <mlenn...@club.worldonline.be> > >> 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 >> grass-user@lists.osgeo.org >> http://lists.osgeo.org/**mailman/listinfo/grass-user<http://lists.osgeo.org/mailman/listinfo/grass-user> >> > > -- --------------------------------------------------------------- Associação Leonel Trindade SOCIEDADE DE HISTÓRIA NATURAL Apartado 25 2564-909 Torres Vedras Portugal Sede e Biblioteca: rua Cavaleiros da Espora Dourada, 27A 2560 Torres Vedras Laboratório de Paleontologia e Paleoecologia: Polígono Industrial do Alto do Ameal 2565-641 Ramalhal http://alt-shn.blogspot.com www.alt-shn.org
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