[GRASS-user] Thiessen Polygons

[Dylan Beaudette]

On Wednesday 11 February 2009, MORREALE Jean Roc wrote:
> Hamish a écrit :
> > Kurt Springs wrote:
> >> Does anyone know how to do Thiessen Polygons in GRASS?
> >>
> >> I need to use them around various types of megalithic tomb
> >> sites that are in point vector files.
> >
> > v.voronoi
> >
> >
> > there is some replacement test code to look at in grass-addons as well:
> >  http://trac.osgeo.org/grass/browser/grass-addons/vector/voronoi
>
> While we are on this topic, is there a way to get a weigthed voronoi
> diagram using grass ?
>
> The ability to rank a point to tune the area's influence would be great,
> for that purpose I've been using an arcgis'extension* but with grass it
> is not possible**. Is there a way to get a similar result ?
>
> *http://www.geog.unt.edu/~pdong/software.htm
> **http://osdir.com/ml/gis.grass.user/2004-04/msg00036.html
>
> Regards,
> MORREALE Jean Roc

What exactly is a 'weighted voronoi diagram' (the link does not work)? If you 
are after a weighted network connecting points, here is one approach:

http://casoilresource.lawr.ucdavis.edu/drupal/node/698

Dylan



-- 
Dylan Beaudette
Soil Resource Laboratory
http://casoilresource.lawr.ucdavis.edu/
University of California at Davis
530.754.7341