[GRASS-user] creating contour maps from x,y.z data

[Moritz Lennert]

On 23/07/08 01:44, Tim Michelsen wrote:
> Hello,
> I found the python matplotlib basemap toolkit as an easy and fast tool 
> to plot data from a xyz data file (regular spaced) as a contour map.
> 
> For an online example see:
> http://matplotlib.sourceforge.net/screenshots.html
> 
> What is the GRASS workflow to accomplish this?
> 
> I dis:
> 
> v.in.ascii my_xyz
> v.surf.idw
> 

try

- v.surf.rst or r.surf.nnbathy (add-on).
- r.in.xyz


> But the result map was rather coarse with a lot of pixels 

Try changing your resolution settings.

> and no 
> definitive contours. 

Did you run r.contour to create the contours ?

Moritz