[Qgis-user] watershed creation

[Ralf Suhr]

Did you set the "area of interest" with g.region=dem?

Am Montag, 16. Februar 2009 23:34:02 schrieb G. Allegri:
> I usually use r.watershed directly from GRASS and I choose the output
> I desire (basin, drainage, stream segments, etc.), and the command
> looks something like:
>
> r.watershed elevation=dem drainage=out_drain basin=out_basin
>
> to get the raster of basins with unique values (basin) and the
> drainage network (drainage).
>
> Which QGIS version are you using? What OS? How big is your dem? What
> resolution?
>
> giovanni
>
> 2009/2/16 ambrish dhaka <ambijat at hotmail.com>:
> > Hello all,
> > I found that the raster > hydrology..> watershed tool does not create the
> > desired image.
> > I used three things...1) the dem raster as source, 2) threshold value of
> > 1000 and 3) output name as accu1.
> > Is there anything else left?
> > Why it is not producing, and how can I create basins?
> > Regards,
> > Ambrish Dhaka
> >
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-- 

Ralf