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
stream-map.pdf
Description: Adobe PDF document
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