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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