[GRASS-user] raster analysis: hot to get summarized values of two rasters

[christian Brandt]

Dear list,

I have two rasters with elevation data (DEM and buildings, both floating point) which I would like to overlay so that the resulting raster obtains the summarized z-values of both rasters. 
So I tried the r.patch and the r.mapcalculator with the result of just <physically> overlaid layers. E.g. at one cell where the DEM holds the z-value 435.0 m and the building raster the z-value 10.1 there still remain the 435.1 m in the resulting raster. 
In case of r.mapcalculator, I used the Layer A + Layer B option. 

How can I get the summarized values of both raster layers?

Regards

Christian

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