[GRASS-user] bug? r.watershed strange outputs

[Ken Mankoff]

Hi List,

I'm running r.watershed like this:

r.watershed -s elevation=e drainage=dir

Attached is a graphic showing the elevation input and direction output.

If you look near the burgundy square in the elevation at the 4.0 value to the NW, *everything* near that cell should flow into it (all neighbors are >4.0). However, if you look at the direction output, the 4.8 value (south of 4.0 and west of the burgundy 4.4) flows to the NE out of the domain (direction = -1). This seems like a bug.

Viewing the output direction raster, the burgundy "3" flows into the "-2" to the NW. That means that is ONE catchment. But it is bisected by a different catchment (the -1 flowing out of the domain).

  -k.

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