[GRASS-user] Personalised raster alghoritm (simple: area)

[Daniel Lee]

Hi Antonello,

I would first make a field for the area in the vector attribute table with
v.db.addcol, then compute the area of each vector with v.to.db and store it
in the attribute table. Then I'd convert the vectors to rasters using the
parameter "use=attr" and tell GRASS to use the area column as the cell
values. Hope that helps!

Daniel

--

B.Sc. Daniel Lee
Geschäftsführung für Forschung und Entwicklung
ISIS - International Solar Information Solutions GbR
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2012/6/12 Antonello Lobianco <antonello at lobianco.org>

> Hello everybody on the list!
>
>   I am a "occasional" grass gis user and I'm stuck with a relatively
> simple task: I have a high-res vector layer describing only one category
> (Corine Land Cover map for "broad-leaved forests", 311) and I want to
> rasterise it in a low-res 8-by-8 km raster map where the value stored on
> each cell is the area (or, that's the same, the share of the area) that the
> vector cover within that cell.
> So each pixel/cell would have a value ranging from 0 (no broad-leaved
> forest at all) to 64 (all the area of the pixel is covered by
> broaded-leaved forests).
> I already managed to get the region with the right cell dimension, add the
> area geometry to the vector and load it in grass, but I don't know now how
> to rasterize it (v.to.raster seems to me to not offer the option to put the
> area, but only a specific catgegory, but maybe I am wrong??).
>
> Thank you for any hint you could provide me.
>
> Antonello
>
>
> --
> Antonello Lobianco
> INRA, Laboratoire d'Economie Forestière
> 14 Rue Girardet - 54000 Nancy, France
> Tel: +33.652392310
> Email: antonello.lobianco at nancy-engref.inra.fr
> http://antonello.lobianco.org
>
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