[GRASS-user] Cost Path

[Roberto Marzocchi]

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 <mlennert a 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
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