[GRASS-user] Introducing myself and my first questions

Pietro Zambelli peter.zamb at gmail.com
Fri Dec 28 01:26:46 PST 2012

On Friday 28 December 2012 09:13:28 Paul Meems wrote:
> Thanks Daniel,
> This really helps. I understand it more, not all ;)
> I started creating the slope and aspect files first using:
> r.slope.aspect elevation="w001001 at temp" slope="slope" aspect="aspect"
> format="degrees" prec="float" zfactor=1.0 min_slp_allowed=0.0
> But this didn't work. It took 0 seconds and I got empty data files.
> I can view my input file so I assume that it is good.
> Reading the manual doesn't give me any clues what I'm doing wrong.
> My input file contains several houses so slope and aspect can be calculated.
> Any new pointers are much appreciated.

Did you set the computational region [0]?

to set the region to the elevation map, you can use the GUI, or type:
> g.region rast="w001001 at temp"


[0] http://grasswiki.osgeo.org/wiki/Computational_region

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