Hello. I have an idea using Thiessenn or voronoi by tripack.
Extending this "points2grid()" method for grid polygon data will make calculation of spatial weight matrices of spdep better? Regards --- Roger Bivand <roger.biv...@nhh.no> wrote: > On Wed, 6 Jan 2010, Pierre Roudier wrote: > > > Dear list, > > > > I'm looking for an easy way to test if a point > pattern (I got a data > > frame of x and y coordinates) is on a regular grid > or not. > > > > I'm aware of the gridded() function in sp(), but > this function is > > devoted to assign rather than to test, as far as I > know. I'm pretty > > sure there's an easy way to do that though.... > > Use try(points2grid()) - if this returns an object > of class "try-error", > the points do not lie on a grid. > > Roger > > > > > Any suggestions ? > > > > Thanks, > > > > Pierre > > > > _______________________________________________ > > R-sig-Geo mailing list > > R-sig-Geo@stat.math.ethz.ch > > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > > > > -- > Roger Bivand > Economic Geography Section, Department of Economics, > Norwegian School of > Economics and Business Administration, Helleveien > 30, N-5045 Bergen, > Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43 > e-mail: roger.biv...@nhh.no > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo