[GRASS-user] DEMs not reporting elevation

[Markus Neteler]

John,

did you run

g.region rast=demmap -p
first? You have to set the current region to the map (or spatial subset) to
work with it.

Markus

John C. Tull wrote on 07/24/2007 07:19 AM:
> I have been having no luck today working with DEMs in GRASS. I have
> tried several sources for DEM data derived from 24k quads. I can bring
> in the dem and it will draw with color as expected. If I query the
> map, I do not get elevation:
> 449208.962656|4171350.10373||*
>
> If I try to produce a hillshade from the map, it is blank. This is
> making me a bit insane because I have done these things before without
> issue. I have no problem using the dem in the spearfish dataset.
>
> I am unable to get things working using a 24k dem from:
> ftp://nas.library.unr.edu/keck/30mDEM/30mdemzip/quad1113.zip
>
> After renaming the .dem file to alcatraz_island (although I also tried
> using a NED file in another format with no name changes), I ran:
> r.in.gdal input=alcatraz_island.dem output=alcatraz_island_dem
>
> The colors are there in my region and can be changed with r.colors as
> expected, but I still have nothing returned on query. I am trying to
> use r.mapcalc or r.recode to derive a band along a contour, but I only
> get empty files returned. Is there something simple I am overlooking.
>
> This happens with both 6.2.2 and 6.3cvs.
>
> Thanks,
> John Tull


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ITC -> dall'1 marzo 2007 Fondazione Bruno Kessler
ITC -> since 1 March 2007 Fondazione Bruno Kessler
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