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

Moritz Lennert mlennert at club.worldonline.be
Thu Feb 22 01:57:29 PST 2018

On 22/02/18 02:18, Kevin Labre wrote:
> HI Daniel, Moritz,
> Thanks a lot for your quick replies.
> I did not set the region to the extent of my maps, because I didn't know 
> what values to use


and then running r.contour on each MNT should do the trick.

> Following Moritz's advice, I've attached a .txt file with the output 
> g-region -p, r-info on each of the raster files and v.info 
> <http://v.info> on the 4 contour vector files.

g.region -p shows that the region is set to encompass only the two 
southern MNT's. However, I don't understand the output of v.info 
Contours517 at K which shows that there are 22 lines in a bounding box with 
0 E-W extension ( E: 322072.25, W: 322072.25), while the region is 
defined with

west:       322072
east:       322572.5

i.e. it goes to the western edge of MNT_517. Maybe the region that was 
set when r.contour was run was not the same as the one you see now ?

> Daniel I'll try the r.patch command as soon as I have a moment.

This is probably the easiest for you:


g.region rast=myMNT

r.contour in=myMnt


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