[GRASS-user] Problem with r.watershed in Spearfish
Margherita Di Leo
diregola at gmail.com
Mon Jan 25 17:21:00 EST 2010
Thank you for answering.
Milton Cezar Ribeiro wrote:
> Check with g.region -p and see how many 100x100 pixels you have.
GRASS 6.5.svn (spearfish60):~ > g.region -p
projection: 1 (UTM)
> May be it is very small for your threshold.
I don't think so, because the streams are well delineated. The problem
is the value assigned to them (zero).
> 2010/1/25 Margherita Di Leo <diregola at gmail.com
> <mailto:diregola at gmail.com>>
> Hi list!
> I often used r.watershed without problems, but today i had a very
> strange one. Please can anyone verify that?
> I used Spearfish mapset, map: elevation.10m:
> g.region res=100
> r.watershed elevation=elevation.10m at PERMANENT threshold=100
> accumulation=acc_10 drainage=dir_10 stream=str_10 convergence=5
> The stream map has many streams with 0 value.
> The problem is only with res=100.
> Does r.watershed fail?
> Thank you
Eng. Margherita Di Leo
Methods and Technologies for Environmental Monitoring
Department of Environmental Engineering and Physics (DIFA)
University of Basilicata
Campus Macchia Romana
85100 - Potenza
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