[GRASS-user] % of cover class upstream

[Milton Cezar Ribeiro]

Hi guys,

sorry for my delay. I am trying your suggestions.

cheers

milton

2009/11/14 Rich Shepard <rshepard at appl-ecosys.com>

> On Sat, 14 Nov 2009, Milton Cezar Ribeiro wrote:
>
> I have a DEM, a drainage  and a Cover mapa, and I need to estimate - for
>> ANY pixel of my drainage - what is the amount of my cover classes that
>> "contribute" (or are upstream) of that pixel.
>>
>
> milton,
>
>  Not all my data are imported and defined to the critical area so I cannot
> offer direct experience. However, Single Flow Direction (SFD, D8) moves
> flow
> into a single downslope cell and is used by r.watershed and r.terraflow.
> D-infinity, or vector grid approach, is used by r.flow. Multiple Flow
> Directions (MFD, what you probably want to use) partitions the flow into
> two
> or more downslope directions and is used by r.terraflow, r.topmodel, and
> r.mapcalc flow implementation in the r.mapcalc tutorial. Also check out
> r.hydro.CASC2D.
>
> HTH,
>
> Rich
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