[GRASSLIST:7169] Re: grass rasters on mapserver

Paolo Cavallini cavallini at faunalia.it
Wed Jun 15 09:36:12 EDT 2005

Now I got it.
Thanks Radim.
All the best.

At 14:24, mercoledì 15 giugno 2005, Radim Blazek has probably written:
> On 6/15/05, Paolo Cavallini <cavallini at faunalia.it> wrote:
> > Hi all.
> > We're trying to add grass raster layers to a mapserver (UNM) application,
> > but we encounter problems. Our .map definition is:
> >    NAME "landsat"
> >    DATA "/home/Documenti/datigrass/Toscana/PERMANENT/cellhd/sat"
> > END
> > but the raster (a Landsat map) is not displayed correctly. I assume this
> > is related to the mentioned 8/24 bit limitation mentioned in
> > http://grass.itc.it/start.html
> > However, I find contradictory notes about this:
> > - in the web page I find " GRASS raster map directly read from location
> > must be in 8bit", whereas in http://grass.itc.it/spearfish/README there
> > is "Hint: Mapserver currently only displays 8bit/24bit Integer images."
> > Is there a way to display directly grass rasters in full color, or are we
> > limited to 8bit (in this case, tiff may be a better choice, but we would
> > prefer to avoid data duplication).
> > And where exactly is the limitation? If it is in gdal, how can qgis
> > display the same rasters correctly?
> GRASS raster driver in GDAL represents the color table as metadata and
> QGIS knows about that and it can use it while Mapserver cannot.
> I think that the right and 'quick' solution is to ask Mapserver developers
> to add support for color tables passed in metadata. Frank plans some more
> advanced color table model but it can take years(?). The format of of
> metadata was discussed
> with Frank.
> Radim
Paolo Cavallini
cavallini at faunalia.it   www.faunalia.it   www.faunalia.com
Piazza Garibaldi 5 - 56025 Pontedera (PI), Italy   Tel: (+39)348-3801953

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