Wow, that was fast. I was just about to reply the I found out I should put the ports as starting points. And that is clearly stated in the manual
https://grass.osgeo.org/grass70/manuals/r.cost.html#shortest-distance-surfaces Thanks all Cheers On Fri, Nov 10, 2017 at 2:21 PM Moritz Lennert <[email protected]> wrote: > Le Fri, 10 Nov 2017 16:03:45 +0000, > Daniel Victoria <[email protected]> a écrit : > > > Hi list, > > > > I want to calculate a cost of getting from any cell in my raster to > > some ports, considering roads network, and I though r.cost could > > solve this. > > > > What I have is: > > 1) Cost raster map with cost per cell (10 for normal cells, 1 if it's > > a road) > > 2) vector map containing several ports > > 3) start_raster has the same extent of the cost raster, but all cells > > == 1 > > > > This is the command I'm using > > r.cost input=cost_map output=cum_cost stop_points=ports > > start_raster=my_region > > Just try it with r.cost input=cost_map output=cum_cost > start_points=ports > > Moritz >
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