[GRASS-user] raster merging

[Cassiel]

2009/3/18 Nikos Alexandris <nikos.alexandris at felis.uni-freiburg.de>

> On Wed, 2009-03-18 at 16:17 +0100, Cassiel wrote:
> > Hi you all,
> >
> > I am working with geotiff raster data served on a webgis (mapserver +
> > pmapper) and I would like to serve a merged raster (DEM + its shaded
> > relief) instead of serving two distinct raster/layer with my mapfile
> > (one for the dem and one for the shaded relief).
> >
> > Should I go with r.mapcalc in order to obtain a suitable GTiff for
> > mapserver?
> >
> > Regards
> > raffaele
>
> Raffaele,
>
> perhaps r.blend is what you are looking for. After some trial and error
> (concerning the "Percentage weight of first map for color blending")
> you'll get a nice looking shaded DEM that you can use (export).
>
> Kind regards, Nikos
>

Yes it is,

running

g.region res=80
r.blend first=italia20m second=shade80 output=m80 percent=50
r.composite -d red=m80.r green=m80.g blue=m80.b levels=32 output=dem80
r.out.tiff -t input=dem80 output=dem80.tif compression=lzw

give me the GTiff I wanted.

thank you for helping.

Regards
raffaele
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