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

[Johannes Radinger]

Yes of course, r.statistics resp. r.statistics2 is doing the job. I just
mixed up the the maps when I tried it the first time.
Thanks Markus and Moritz!



On Thu, Nov 28, 2013 at 9:22 AM, Moritz Lennert <
mlennert at club.worldonline.be> wrote:

> On 26/11/13 16:28, Johannes Radinger wrote:
>
>> 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?
>>
>
> r.statistics ?
>
> Moritz
>
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