On Mon, May 7, 2012 at 1:08 PM, ivan marchesini <[email protected]> wrote: > 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.
Please report if the stream segments are as expected, because the determination of half-basins and basins is based on the stream segments. If the stream segments seem out of place, something is wrong with the identification of stream segments and you will need to look at flow accumulation and check if that makes sense. If the stream segments seem to be ok, something is wrong with determining the left and right side of a stream. Markus M _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
