Hei Antonello,

Have a look at r.univar (https://grass.osgeo.org/grass70/manuals/r.univar.html)
And the zone option.

Cheers
Stefan

From: grass-user [mailto:grass-user-boun...@lists.osgeo.org] On Behalf Of 
Antonello Lobianco
Sent: 19. september 2016 18:42
To: grass-user <grass-user@lists.osgeo.org>
Subject: [GRASS-user] How to print a table with the values of a given raster 
layer aggregated by a second raster layer ?


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 ?



Cheers,

  Antonello




--
Antonello Lobianco
AgroParisTech, Laboratoire d'Economie Forestière
14 Rue Girardet - 54000 Nancy, France
Tel: +33.383396865
Email: antonello.lobia...@nancy.inra.fr<mailto:antonello.lobia...@nancy.inra.fr>
http://antonello.lobianco.org<http://antonello.lobianco.org/>
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