[GRASS-user] bash scrip r.cost/r.drain

[Anders Gonçalves da Silva]

Hi Micha.

Thank you very much. That worked like a charm. With that initial kick, I was able to create a little loop that goes through each point in my dataset, and outputs a column matrix with pairwise distances for each observation. Now, I just need to add more friction rasters.

Cheers,

Anders.

On 31/08/2010, at 12:32 AM, Micha Silver wrote:

> On Mon, 30 Aug 2010 20:38:40 +1000
> Anders Gonçalves da Silva <andersgs at gmail.com> wrote:
> 
>> Hello all. 
>> 
>> I was wondering if anyone has a bash script that runs over all pairs
>> of points in a vector file, using them each in turn as
>> start_coordinate in r.cost, and as a final point in r.drain. Thank
>> you. Or, something similar that I could easily modify to my purposes.
>> 
> 
> You could probably start by throwing the points into a text file with
> v.out.ascii, then loop thru that file with something like:
> 
> v.out.ascii <vector> out=ascii_vector_points.txt fs=space
> while read X Y ;
> 	do <your r.cost command coord=$X,$Y>;
> done < ascii_vector_points.txt
> 
> 
>> Anders._______________________________________________
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>> 
>