Hi Rich, unfortunately I don't have enough information in order to help you, would it be possible to provide a sample data?
thanks and regards, madi On Fri, Oct 26, 2012 at 1:40 AM, Rich Shepard <[email protected]>wrote: > For a reason I've not been able to determine in a long day today r.basin > fails to properly complete when passed easting/northing coordinates of a > cell generated by r.stream.extract. The last three ratios are shown as NAN > and the area is shown as only 4km^2 when it's actually much larger. With > other sub-basins this result was corrected by moving the outlet point > further upstream from the confluence with a larger stream. > > Following the r.basin wiki that madi wrote, I re-extracted the streams > from the DEM. Ran r.watershed to generate an accumulation map, then > r.stream.extract. Both modules take the same DEM map (named dem_proj). But, > when I place the outlet point several cells above the confluence r.basin > does not properly complete. I tried moving the outlet away from the > confluence, but still no joy. > > The attached PDF shows the outlet point sitting in the middle of a cell > on > the stream_network raster generated by r.stream.extract. > > I'm at a loss to understand why this one sub-basin is fighting me, and I > would like outside opinions on what might be the cause and suggestions of > what to try to isolate the cause of this problem. If more information is > desired, I'll try to provide it. > > Rich > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user > > -- Margherita DI LEO Postdoctoral Researcher European Commission - DG JRC Forest Resources and Climate I-21020 Ispra (VA) - Italy - TP 261 Tel. +39 0332 78 3600 [email protected]
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