Justin wrote: > Hello, I’m working with LiDAR data imported as vector points. Ideally > we would like to consolidate groups of close-together points into > vector areas. Is there a way to do this automatically, maybe based on > proximity? We’ve looked into using v.delaunay, but this seems to > combine ALL points into a single area. We only want points in close > proximity to be combined into areas. Any help you can give is greatly > appreciated!
v.buffer is one way.. for LIDAR coverage extent maps I'd usually try a 2-5m buffer around all points. If that's too slow for a massive dataset then v.to.rast+r.buffer or r.in.xyz+r.buffer may help. perhaps you want something like v.kernel + a threshold extraction? or perhaps a good thing to look at is one of the "home range" add-on modules (which is essentially a similar thing) maybe Anne could comment on that? http://grass.osgeo.org/wiki/GRASS_AddOns#v.adehabitat.clusthr.2C_v.adehabitat.kernelUD.2C_v.adehabitat.mcp or v.points.cog + v.buffer http://grass.osgeo.org/wiki/GRASS_AddOns#v.points.cog or something with v.hull? (but that's all points..) or as raster points with one of the 'clump' algorithms? and if all else fails, the R-stats interface will surely have some tool.. Hamish _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
