[GRASS-user] v.water.outlet

[Markus Metz]

On Thu, Jan 5, 2012 at 12:16 PM, Paolo Cavallini <cavallini at faunalia.it> wrote:
> Il 04/01/2012 20:55, Micha Silver ha scritto:
>
>
>> I guess you mean r.water.outlet?
>
>
> Yes, sorry.
>
>
>> 1- The input must be the drainage *direction* map from r.watershed.
>
>
> ok
>
>
>> 2- And it's crucial that the easting and northing parameters for the
>> outlet point lay
>> exactly on a stream. Zoom in very close to the streams raster at the
>> outlet point and
>> check for the exact coordinates.
>
>
> Checked, it seems ok.
> The output maps is all 0s, with only one cell (close to the point I chose,
> but not on it) with value 1.

This is weird. The cell in which the point you chose is located should
always be included in the basin created by r.water.outlet. Make sure
your computational region is set to the drainage raster. At least we
know now that r.water.outlet produces something, because the output is
not all 0s, at least one cell is 1.

Markus M