[GRASS-user] raster analysis: hot to get one <elevation raster> from two elevation rasters?

[christian Brandt]

Hi Daniel, hi Jachym, hi list!

I am very sorry but I couldn't get back earlier to your replies.

What I want to do is to get just one <elevation-raster> with combined elevation data from DGM raster and buildings raster

Hence I tried the r.mapcalculator as follows:
r.mapcalculator amap=dgm bmap=geb formula=A+B outfile=dgm_geb

The result just shows the same cell configuration as in the building raster but with elevation data just from the DGM.

Regards

Christian

> Date: Tue, 20 May 2008 09:17:30 -0300
> From: daniel.victoria at gmail.com
> To: jachym.cepicky at gmail.com
> Subject: Re: [GRASS-user] raster analysis: hot to get summarized values of two rasters
> CC: chrisbrandt74 at hotmail.com; grass-user at lists.osgeo.org
> 
> It appears that you don't want to add the rasters but be able to query
> both values at once. From the command line you can use
> r.what.rast rast=raster_1,raster_2 <missing coordinates part, don't
> have grass in front of me now>
> and you will get the values for both rasters at the desired coords. I
> don't know how to do that using the grass GUI though
> 
> Cheers
> Daniel
> 
> On Tue, May 20, 2008 at 6:49 AM,  <jachym.cepicky at gmail.com> wrote:
> > hi,
> >
> > r.mapcalc sum=map1+map2 would not help?
> >
> > j
> >
> > 2008/5/20, christian Brandt <chrisbrandt74 at hotmail.com>:
> >>
> >> 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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> > --
> > Jachym Cepicky
> > e-mail: jachym.cepicky gmail com
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