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