[GRASS-user] r.drain

GRASS GRASS user
1

Hi all.
I'm testing r.drain, but I cannot get reasonable results over a dtm: the
line produced is always much too short, stopping where it seems it
should proceed. I exaggerated elevation (*100000), as suggested by the
manpage, but results were only slightly better.
Any suggestion?
Thanks.
--
http://www.faunalia.it/pc

2

Hi Paolo,
try to use r.fill.dir on the elevation map with ~3 - 4 runs before you
use r.drain.

Best regards
Soeren

2011/3/24 Paolo Cavallini <cavallini@faunalia.it>:

Hi all.
I'm testing r.drain, but I cannot get reasonable results over a dtm: the
line produced is always much too short, stopping where it seems it
should proceed. I exaggerated elevation (*100000), as suggested by the
manpage, but results were only slightly better.
Any suggestion?
Thanks.
--
http://www.faunalia.it/pc

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3

Il giorno gio, 24/03/2011 alle 12.47 +0100, Soeren Gebbert ha scritto:

Hi Paolo,
try to use r.fill.dir on the elevation map with ~3 - 4 runs before you
use r.drain.

Thanks Soeren, that improved the results considerably.
It would be good to have an option to set the level of filling (by
recursion, if nothing better is available).
All the best.
--
http://www.faunalia.it/pc