[GRASS-user] r.watershed: output basin map

[Rich Shepard]

   The attached pdf shows the basin map output by r.watershed based on a 10m
DEM and a threshold of 150000. The NHD level 6 subbasins are outlined in
black and the 1:24K NHD streams are in blue.

   The small white areas at the bottom left and center right appear to be
external to defined sub-basins. But I don't know how to interpret the larger
white areas with streams in them (center and top). The top margin is an
international boundary so I can understand not being able to completely
define sub-basins across that boundary since the DEM doesn't reach that far
north, but it's not consistently white.

   Please help me interpret the white areas with vector streams.

TIA,

Rich
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