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

[Moritz Lennert]

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

g.region 
rast=MNT_Kourou_50cm_000517,MNT_Kourou_50cm_000518,MNT_Kourou_50cm_000551,MNT_Kourou_50cm_000552

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:

r.patch 
in=MNT_Kourou_50cm_000517,MNT_Kourou_50cm_000518,MNT_Kourou_50cm_000551,MNT_Kourou_50cm_000552 
out=myMNT

g.region rast=myMNT

r.contour in=myMnt

Moritz