On 11/20/2015 01:02 AM, wcd wrote:
Hello all,
Does GRASS have a tool equivalent
to what ArcGIS calls Flow Accumulation? Input is a flow
direction raster and output is a cumulative catchment area
raster. As an optional argument you can specify a weight
raster, which is really important for what I am trying to do -
count cells of woodland upstream from each cell in the flow
direction grid.
All GRASS tools I thought could do
this require DTM as input, not flow direction raster, and they
also don't allow to specify the weight raster. As far as I can
see.
As far as I can see, you have one option: r.drain creates drainage
lines based on a flow direction grid and and input grid ("weight"
raster). With the "-a" flag the total weights are placed into the
output cells. But this module gives you accumulation only along the
drainage lines, NOT a full flow accumulation grid.
Do you know about any other OSGeo
tools that could do this? Ideally Python friendly?
Best regards,
Filip Kral.
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Micha Silver
Arava Drainage Authority
+972-523-665918
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