[GRASS-user] r.watershed MFD strange basin

[ivan marchesini]

Dear Grass users,
I have noted a strange result from r.watershed using the MDF option
(with all levels of convergence).

This is a part of my DEM:

http://imageshack.us/photo/my-images/690/demv.png/


This is the result obtained using SDF:

http://imageshack.us/photo/my-images/843/27420800.png/


This is the result obtained using MDF:

http://imageshack.us/photo/my-images/190/36629290.png/



Please have a look to the last picture.
In the central part of the image (near to the pointer) there is a little
basin connected to the larger one that is on the other side of the
valley.

It seems an error.

did someone else encounter a similar problem?

many thanks

Ivan


-- 
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Preferisco formati liberi.
Please try to avoid to send me .dwg, .doc, .xls, .ppt files.
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Ivan Marchesini
Perugia (Italy)
Socio fondatore GFOSS "Geospatial Free and Open Source Software" http://www.gfoss.it
e-mail: ivan.marchesini at irpi.cnr.it
        ivan.marchesini at gmail.com
fax (mailfax): +39 1782092534
jabber: geoivan73 at jabber.org
skype: geoivan73
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