[GRASS-user] extract drainage in the right direction

[Markus Metz]

On Tue, Jan 24, 2012 at 8:03 PM, Mark Seibel <mseibel at gmail.com> wrote:
> Hi,
>
> On Tue, Jan 24, 2012 at 1:24 PM, Marcello Benigno
> <benigno.marcello at gmail.com> wrote:
>>
>> Hi All,
>>
>> There is some methodology where it is possible extract the drainage
>> network and maintain the correct graph orientation?
>
>
> Regrettably, I cant say for sure, but I would be surprised if the vector
> stream/drainage network output from r.stream.extract did not orientate
> vector directions downstream properly.
>  http://grass.osgeo.org/wiki/GRASS_AddOns#r.stream.extract
>

Yes, the stream lines in the vector output of r.stream.extract are
directed downstream.

Markus M