#3756: r.watershed: flow accumulation wrong with edge contamination
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Reporter: itati01 | Owner: grass-dev@…
Type: defect | Status: new
Priority: normal | Milestone:
Component: Raster | Version: svn-releasebranch76
Resolution: | Keywords: r.watershed, flow accumulation,
CPU: | edge contamination
Unspecified | Platform: Unspecified
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Comment (by mmetz):
Regarding edge cells (cells bordering a nodata cell), flow can not be
distributed and thus not accumulated because of these neighbor cells with
nodata. Flow distribution can not be determined if any neighbor is nodata.
Consequently, flow accumulation for cells where any neighbor is nodata is
set to -1. Exceptions are cells with a nodata neighbor that receive
surface flow from cells that do not have a nodata neighbor.
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Ticket URL: <https://trac.osgeo.org/grass/ticket/3756#comment:1>
GRASS GIS <https://grass.osgeo.org>
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