[GRASSLIST:72] Re: r.water.outlet - catchment

[Cannata, Massimiliano]

Maybe it is obvious, but did you choose a cell in the 
river?
I mean, was the flow accumulation different from 1?
The chosen point should reside into a pixel with high flow 
accumulation values (many cell drain into it and the basin 
can be extracted).
I succesfully used it many time with the dir map from 
r.watershed...
Maxi



On Tue, 14 Mar 2006 01:13:49 +0000
  José Miguel Delgado <jmmd at mega.ist.utl.pt> wrote:
> Hej,
> 
> I am trying to get a catchment from r.water.outlet
> 
>For that I am using a drainage direction raster that I 
>obtained from r.fill.dir, using type "answers"
> 
> I have tried several times with different coordinates 
>for the outlet, but all I got was a raster full of zeros.
> 
> Am I doing something wrong? (possibly the input for 
>r.water.outlet is not a "answers" type or I have been 
>choosing bad points with local distubances in topography 
>for outlet - .hgt 90 m res)
> 
> Thank you for your help,
> --
> José Miguel Delgado
> jmmd at mega.ist.utl.pt
> +351 96 640 72 09
> +46 73 573 23 89
> 

_
--------------------------------------
Eng. Massimiliano Cannata
Geomoatic Phd student
www.ist.supsi.ch