Adrian wrote: > I have LiDAR data in ASCII txt files with only X, Y and Z > coordinates, which I want to import and create DEM models > from in GRASS. I'm new to this kind of data processing.
--> see http://grass.osgeo.org/wiki/LIDAR r.in.xyz + r.surf.nnbathy is my favorite combo for this, but then, I'm biased. 3.5M points should run in a few seconds. (r.surf.nnbathy from the wiki AddOns page) The choice between v.in.ascii and r.in.xyz really depends on if you want to do full analysis on the point cloud or just make a fast DEM from an already cleaned x,y,z set. 3.5M points is on the limit of the number of vector points you can work with in GRASS 6 with full topology and database tables unless you have a computer with lots of RAM. (thus options to disable first database creation and second topology) Hamish _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
