[GRASS-user] Problem with r.watershed in Spearfish

[Milton Cezar Ribeiro]

Margherita,

Check with g.region -p and see how many 100x100 pixels you have.
May be it is very small for your threshold.

best

milton
2010/1/25 Margherita Di Leo <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 memory=300
>
> 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
> Ph.D. Candidate
> Methods and Technologies for Environmental Monitoring
> Department of Environmental Engineering and Physics (DIFA)
>
> University of Basilicata Campus Macchia Romana
> 85100 - Potenza Italy
>
> Office: +39-0971205363
> Fax: +39-0971205160
>
>
>
>
>
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