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

Pierluigi De Rosa pierluigi.derosa at gfosservices.it
Thu Dec 17 06:54:56 PST 2015

Hi Johannes, 

perhaps you procedure could be correct. 
Let'me try and I will notify my progress 

----- Messaggio originale -----

Da: "Johannes Radinger" <johannesradinger at gmail.com> 
A: "Ing. Pierluigi De Rosa" <pierluigi.derosa at gfosservices.it> 
Cc: "grass-user" <grass-user at lists.osgeo.org> 
Inviato: Giovedì, 17 dicembre 2015 11:51:15 
Oggetto: Re: [GRASS-user] Average raster value of the upslope contributing area, 

Hi Pierluigi, 

I think here you could use the tool r.watershed ( https://grass.osgeo.org/grass70/manuals/r.watershed.html ) 
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: 

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: 

How can I do that? 


Ing. Pierluigi De Rosa (PhD) 
Studio Associato GFOSSERVICES 

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grass-user at lists.osgeo.org 

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