[GRASS-user] Fwd: ASC files - Contours lines on elevation map on GRASS 7.4/Ubuntu 16.04

Lluís Vicens lluis.vicens at udg.edu
Thu Feb 22 03:23:55 PST 2018

Hi Kevin, 
I guess it is a problem with your region. Once you imported your four
ascii files into your mapset, you have to define a region to fit the
extension and resolution of your four raster layers, before performing
any kind of analysis.
So, you should execute the following command in order to adapt your
region to your files:
$ g.region
Then you can patch your raster files into a single raster layer:
$ r.patch
517,MNT_Kourou_50cm_000518 out=MNT_Kourou_50cm_patch
And finally apply the r.contour tool.
Hope this helps!
El dc 21 de 02 de 2018 a les 07:31 -0300, en/na Kevin Labre va
> Dear list, 
> I'm quite new to GRASS and Ubuntu, it might be an easy question. 
> I'm trying to display contour lines on a map of the piece of land I'm
> buying.
> The data used is 4 .asc files with respective .prj files created
> under ARCGis on Windows, projection RGFG95 UTM 22N. They're imported
> into Grass using the r.import command.
> I can load them and managed to display contour lines using r.contour
> on one or the other, but not the four tiles altogether:
> Are there any steps I'm missing?
> Thanks for your time!
> Kevin
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Lluís Vicens
Servei de Sistemes d'Informació Geogràfica
Universitat de Girona - SIGTE
Pl. Ferrater Mora 1
17071 Girona
Tel +34 972 418 039 (7025 intern)
lluis.vicens at udg.edu

Lloc web: http://www.sigte.udg.edu
Twitter: http://twitter.com/SIGTE_UDG
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