Dear Grass Developer's List,
On Behalf of Mike Zoldak:
I'm new to open source GIS and have been working with the GRASS 6.0 beta for a couple of weeks now. I like what I've seen so far. I want to take advantage of it's OS nature and have a task where it seems I must.
I have 3D vector points and need to create a triangulation that meets Delaunay criteria in 3 dimensions. The next step in my process is to extract node and edge tripletes and write them to an ascii file, so I don't need to construct a truly functional surface for visualization purposes.
The v.delaunay with the -l option almost meets my purposes. It meets the criteria in 2D, but not 3D. The resultant topology drops the z-coord that was in the original point file when creating the nodes in the output line file. I would like to modify v.delaunay so that the z-coord is used in the calculation and (naturally) kept in topological structure.
To this end, I download the latest snapshot, grass-6.0.cvs_src_snapshot_2005_02_12, and started to examine the C code for v.voronoi (the broader function set). But I am no programmer, let alone C programmer, and couldn't quite follow the code. If one of the developers is not too busy, I'd like some advice on resources I could use, specific alterations (if not too extensive), and steps for compiling the altered code with a different name so that I can use it in GRASS.
Thanks;
Mike Zoldak
International Institute for Sustainibility
Arizona State University
Robin Tori Schroeder
Senior Software Developer
International Institute for Sustainability
Arizona State University
480-727-7290
robin.schroeder@asu.edu