[GRASS-user] v.water.outlet

[Markus Metz]

On Thu, Jan 5, 2012 at 12:12 PM, Massimiliano Cannata
<massimiliano.cannata at supsi.ch> wrote:
> Moreover,
> check that your dem has sinks filled (r.fill.dir)

Since the drainage map has been created by r.watershed, sink filling
is not only not needed but does more harm than good and should not be
used to prepare a DEM for r.watershed.

Markus M

>
>
>
> On 01/04/2012 08:55 PM, Micha Silver wrote:
>
> On 01/04/2012 07:27 PM, Paolo Cavallini wrote:
>
> Hi all.
> I tried this command, but I always get a map full of 0. I start from a
> drainage map from r.watershed, as described. Anyone confirms, or am I doing
> something wrong?
> All the best.
>
> I guess you mean r.water.outlet?
>
> You probably know already, but maybe it's worth repeating:
>
> 1- The input must be the drainage *direction* map from r.watershed.
>
> 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.
>
>
> --
> Micha Silver
> GIS Consultant, Arava Development Co.
> http://www.surfaces.co.il
>
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>
> --
>
> Dr. Eng. Massimiliano Cannata
> Responsabile Area Geomatica
> Istituto Scienze della Terra
> Scuola Universitaria Professionale della Svizzera Italiana
> Via Trevano, c.p. 72
> CH-6952 Canobbio-Lugano
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