On Wed, Oct 21, 2009 at 8:47 PM, Roger André <randre at gmail.com> wrote: > This could be done with GRASS, I think. First extract the LAS file > into an ASCII x,y,z file. Then load into GRASS with r.in.xyz. Then > use one of the v.delaunay or v.voronoi GRASS modules. Yes, see: http://grass.osgeo.org/wiki/LIDAR Markus