[GRASS-user] Flow direction to flow accumulation

[wcd]

Hello all,
Does GRASS have a tool equivalent to what ArcGIS calls Flow Accumulation
<http://resources.arcgis.com/EN/HELP/MAIN/10.2/index.html#/Flow_Accumulation/009z00000051000000/>?
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.

Do you know about any other OSGeo tools that could do this? Ideally Python
friendly?
Best regards,
Filip Kral.
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