[GRASS-user] GTiff export

[Jachym Cepicky]

hi,
irrc mapserver can work only with rasters, which have less then 256
values. You can make classes for each elevation level and display it
with desired color, e.g.

CLASS
    EXPRESSION ([pixel] = 38)
    name '390 - 395 m'
    COLOR 253 240 112
    END
CLASS

which means, that all pixels with value 38 will represent elevation
between 390 and 395 meters.

Jachym

On Mon, Dec 18, 2006 at 05:05:11PM +0100, Raffaele Morelli wrote:
> Hi,
> 
> I got two raster files imported in Grass using r.in.gdal, one represents a
> dem, the other is a "drape". (the files originated from ArcGIS)
> I am setting up a WebGis app (apache, mapserver, php_mapscript) and need a
> tiff layer to represent elevation and have a image background to put my
> vectors/points on.
> 
> I tried to export the dem file with r.out.gdal, but I obtain something
> similar to a negative a b/w image with no colors!
> Tried several 'createopt' but still with no success.
> With Grass6.2 everything looks fine.
> 
> Whats' wrong? Should I merge the two raster files first?
> I am not a "GIS geek" so any kind of help will be appreciate.
> 
> thanx
> raffaele

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-- 
Jachym Cepicky
e-mail: jachym.cepicky at centrum.cz
URL: http://les-ejk.cz
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