Thanks all to have pointed me to the right pages. I solved with the
r.univar command:
r.univar -t map=forestArea zones=regionId separator=comma
output=forestArea_by_region.csv
Cheers,
/Antonello
On 19 September 2016 at 21:59, Markus Neteler <nete...@osgeo.org> wrote:
> On Mon, Sep 19, 2016 at 6:41 PM, Antonello Lobianco
> <antone...@lobianco.org> wrote:
> > Let's say in grass I have a raster layer "regionId" and a raster layer
> > "forestArea".
> >
> > In the regionId I have stored the ids of the regions, in the forestArea I
> > stored the square km of forest within the pixel.
> >
> > How can I print a table summing up the forest area by region, that is the
> > sum of the values of a layer aggregated ("group by") by a second layer ?
>
> Please take a look at
> https://grasswiki.osgeo.org/wiki/Zonal_statistics
>
> There are several options.
>
> Best
> Markus
>
--
Antonello Lobianco
AgroParisTech, Laboratoire d'Economie Forestière
14 Rue Girardet - 54000 Nancy, France
Tel: +33.383396865
Email: antonello.lobia...@nancy.inra.fr
http://antonello.lobianco.org
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