[GRASS-user] Selecting starting points for r.flow

[Vincent Godard]

Dear Grass users,

I am using r.flow to generate hillslope flow paths over a high 
resolution DEM. I am actually only interested in a limited number of 
these paths, originating at some selected hilltop points.

r.flow computes flow paths over the whole DEM, and in order to get the 
vectors I am interested in I would need to run the computation over the 
whole region (with skip=1) and select afterward some of these flow 
lines  from the output, which is computationally prohibitive on my DEM 
(potentially millions of lines and I am only interested in a few 1000s 
of them).

Is there way to force r.flow to limit the computation to selected flow 
starting points?

Thanks in advance,

Vincent

-- 
Vincent Godard
CEREGE - OSU Pytheas
Aix-Marseille Université
Europôle Méditerranéen de l’Arbois - BP 80
13545 Aix-en-Provence cedex 04, France
godard at cerege.fr