[GRASS-user] Get sums of raster values based on the categories of an overlay raster

[Johannes Radinger]

Hi,

I'd like to calculate the sum of all raster values that belong to a certain
group. This spatially organized group is also indicated by an overlay
raster (same resolution). Finally I want to assign these sums to a new
raster. That might sound slightly complicated but here an example:

Asume following initial raster map A with random values like:

1-2-1-1-3-4-3-4-2-5-2-3

and an overlay raster indicating 3 groups:

1-1-1-1-2-2-2-2-3-3-3-3

the sums for the groups are:
group 1 = 5
group 2 = 14
group 3= 12

so the final raster would be:

5-5-5-5-14-14-14-14-12-12-12-12

How can such a task be achieved in GRASS (7)?
Any ideas?

/Johannes
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