[GRASS-user] Average raster value of the upslope contributing area,

Johannes Radinger johannesradinger at gmail.com
Thu Dec 17 02:51:15 PST 2015

Hi Pierluigi,

I think here you could use the tool r.watershed (
with your underlying DEM as input. This tool will provide you an
accumulation map with increasing values in
downstream direction.

I am not exactly sure if this is your task, but if you provide an input map
for 'flow' with values for each cell that represents
the actual cell size than the output accumulation map output is your
upslope contributing area. If you
use another input map for 'flow' (e.g. sediment input per cell) than the
output will be the accumulated sediment
in downstream direction. Subsequently you can use r.mapcalc to divide both
maps to get the ratio
of sediment delivery per unit upslope contributing area.

I hope that helps?!


On Thu, Dec 17, 2015 at 11:29 AM, Ing. Pierluigi De Rosa <
pierluigi.derosa at gfosservices.it> wrote:

> Dear users,
> my deal is to calculate a raster of the sediment delivery ratio like
> explained here:
> http://data.naturalcapitalproject.org/nightly-build/invest-users-guide/html/sdr.html#sediment-delivery-ratio
> moreover I need to calculate, for each cell, the average of a raster (C
> factor) of the upslope contributing area.
> take a look to these image to better explication:
> http://data.naturalcapitalproject.org/nightly-build/invest-users-guide/html/_images/connectivity_diagram.png
> How can I do that?
> Thanks
> Pierluigi
> --
> ________________________________________________________________________
> Ing. Pierluigi De Rosa (PhD)
> Studio Associato GFOSSERVICES
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