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

[Lluís Vicens]

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
rast=MNT_Kourou_50cm_000552,MNT_Kourou_50cm_000551,MNT_Kourou_50cm_0005
17,MNT_Kourou_50cm_000518
Then you can patch your raster files into a single raster layer:
$ r.patch
input=MNT_Kourou_50cm_000552,MNT_Kourou_50cm_000551,MNT_Kourou_50cm_000
517,MNT_Kourou_50cm_000518 out=MNT_Kourou_50cm_patch
And finally apply the r.contour tool.
Hope this helps!
Cheers,
Lluís
El dc 21 de 02 de 2018 a les 07:31 -0300, en/na Kevin Labre va
escriure:
> 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
> 
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/grass-user
-- 
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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