Thank you very much Robert. Best,
Manuel On 04/11/2010 10:46 a.m., Robert J. Hijmans wrote: > Manuel, > > library(raster) > # Assuming you have matrix of points (or SpatialPoints*) > pt<- (cbind(runif(100), runif(100)) -0.5) * 500 > spt<- SpatialPoints(pt) > # and a RasterLayer > r<- raster() > > # you can do > > e<- polygonFromExtent(r) > o<- overlay(e, spt) > o<- which(!is.na(o)) > pts<- pt[o,] > > > # show that it worked > plot(pt) > r[] = 1 > plot(r, add=TRUE, legend=FALSE) > points(pt, col='blue') > points(pts, col='red', pch=20) > > > Robert > > On Thu, Nov 4, 2010 at 5:43 AM, Manuel Spínola<mspinol...@gmail.com> wrote: >> Dear list members, >> >> How can eliminate or dismiss points that do not "touch" my raster file? >> This mean those points that are outside of the raster area. >> When I have my plot of the rester and I draw the points: >> >> points (villages) >> >> some of them are outside of the raster not because an error but just >> because the point file is bigger in extent than the raster. >> >> Thank you very much in advance. >> Best, >> >> Manuel >> >> >> -- >> *Manuel Spínola, Ph.D.* >> Instituto Internacional en Conservación y Manejo de Vida Silvestre >> Universidad Nacional >> Apartado 1350-3000 >> Heredia >> COSTA RICA >> mspin...@una.ac.cr >> mspinol...@gmail.com >> Teléfono: (506) 2277-3598 >> Fax: (506) 2237-7036 >> Personal website: Lobito de río >> <https://sites.google.com/site/lobitoderio/> >> Institutional website: ICOMVIS<http://www.icomvis.una.ac.cr/> >> >> [[alternative HTML version deleted]] >> >> >> _______________________________________________ >> R-sig-Geo mailing list >> R-sig-Geo@stat.math.ethz.ch >> https://stat.ethz.ch/mailman/listinfo/r-sig-geo >> >> -- *Manuel Spínola, Ph.D.* Instituto Internacional en Conservación y Manejo de Vida Silvestre Universidad Nacional Apartado 1350-3000 Heredia COSTA RICA mspin...@una.ac.cr mspinol...@gmail.com Teléfono: (506) 2277-3598 Fax: (506) 2237-7036 Personal website: Lobito de río <https://sites.google.com/site/lobitoderio/> Institutional website: ICOMVIS <http://www.icomvis.una.ac.cr/> [[alternative HTML version deleted]]
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