Neighbor matrix from shp file

Barry Rowlingson · 2010-05-12T11:44:34Z

On Tue, May 11, 2010 at 9:40 PM, Roger Bivand wrote: > On Tue, 11 May 2010, Barry Rowlingson wrote: > Use the snap= argument to poly2nb() set to a larger but still small value > than default in that case, say 10m for projected coordinates. Ooh, yes, that's fixed it. > Barry, if you'd like to try SVN spdep from R-forge (and maybe also SVN rgeos > from R-forge), you'll find a number of speedups. Any feedback on those would > be very welcome. Computing the adjacency f

Barry Rowlingson

Wed, May 12, 2010 4:44 AM

On Tue, May 11, 2010 at 9:40 PM, Roger Bivand <Roger.Bivand at nhh.no> wrote:

Ooh, yes, that's fixed it.

Computing the adjacency for about 1500 polygons with 127,000
coordinate points takes about 11 seconds - I should only need to do
this once so I don't think I'll investigate speedups at the moment!

thanks!

Barry

blog: http://geospaced.blogspot.com/
web: http://www.maths.lancs.ac.uk/~rowlings
web: http://www.rowlingson.com/
twitter: http://twitter.com/geospacedman
pics: http://www.flickr.com/photos/spacedman

Thread (5 messages)

Kai Zhang Co-Kriging using two variables versus one variable May 11 Peter Larson Neighbor matrix from shp file May 11 Barry Rowlingson Neighbor matrix from shp file May 11 Roger Bivand Neighbor matrix from shp file May 11 Barry Rowlingson Neighbor matrix from shp file May 12