I have two datasets, both with about 1 million points per dataset (lets
call them A and B). I'd like to know, for each point in A, what the
closest point in B is (e.g. a spatial join). I can (and am) doing this
with the brute force method that ArcMap seems to use (e.g. comparing
each point to every other point, which is a 1,000,000^2 searches), but
is there any way to do this more efficiently? Would a postgis database
(queried through GRASS) work better? Does GRASS even have a gui for
doing postgis queries? Thanks!
--j
--
Jonathan A. Greenberg, PhD
Postdoctoral Scholar
Center for Spatial Technologies and Remote Sensing (CSTARS)
University of California, Davis
One Shields Avenue
The Barn, Room 250N
Davis, CA 95616
Cell: 415-794-5043
AIM: jgrn307, MSN: [EMAIL PROTECTED], Gchat: jgrn307
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