[GRASSLIST:4315] Re: catchment area

[Guillermo Felipe]

You need the dem, and the following commands:
*
**r.watershed **elevation=*/yourdem /*drainage=*/yourdrainage .... 
(please check for more parameters)
*d.rast and d.zoom to identify your basin outlet  coordinates...* (you 
have to take a point on the stream)
/*r.water.outlet* *drainage=*/yourdrainage/ *basin=*/yournewbasin/ 
*easting=*/value/ *northing=*/value
later you can use r.stats , r.average or  r.report with yourbasin map.

too it´s very useful to use r.mask in other to get statistics from other 
maps.

see you

guillermo


/
turek2 wrote:

> Hi,
> How can I calculate it in GRASS?
>
> Maciek
>
>
> ----------------------------------------------------------------------
> Portal INTERIA.PL zaprasza... >>> http://link.interia.pl/f17cb
>
>



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Instituto Alexander von Humboldt


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Instituto Alexander von Humboldt