I'm not exactly sure what you want to do. If you want a new map in which each cell is the sum of the values in the 2 original maps (DEM and buildings), you just add them in the map calculator
R.mapcalc newmap=DEM+buildings If you want a map that is colored to reflect varying combinations of DEM and buildings, use d.his with buildings for the I (intensity) and DEM for the H (hue) entries. d.his h_map=buildings i_map=DEM. Raster maps can have only 1 cat and 1 label, so you can't have a raster that has multiple fields like a vector map can. Michael On 5/20/08 9:00 AM, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > Date: Tue, 20 May 2008 08:08:22 +0000 > From: christian Brandt <[EMAIL PROTECTED]> > Subject: [GRASS-user] raster analysis: hot to get summarized values of > two rasters > To: <[email protected]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="iso-8859-1" > > > 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 __________________________________________ Michael Barton, Professor of Anthropology Director of Graduate Studies School of Human Evolution & Social Change Center for Social Dynamics & Complexity Arizona State University phone: 480-965-6213 fax: 480-965-7671 www: http://www.public.asu.edu/~cmbarton _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
