Thank all of you for responding! I will take a look at rgdal. Cheer!
Steve ----- Original Message ----- From: Roger Bivand <roger.biv...@nhh.no> Date: Thursday, July 9, 2009 4:04 pm Subject: Re: [R-sig-Geo] convert long/lati to UTM To: Barry Rowlingson <b.rowling...@lancaster.ac.uk> Cc: Paul Hiemstra <p.hiems...@geo.uu.nl>, s...@entomology.wisc.edu, r-sig-geo@stat.math.ethz.ch > On Thu, 9 Jul 2009, Barry Rowlingson wrote: > > >On Thu, Jul 9, 2009 at 9:23 PM, Paul Hiemstra<p.hiems...@geo.uu.nl> wrote: > >>Hi, > >> > >>More in general you need to take a look at the sp-pacakge for Spatial > >>classes in R. Once your data is in these classes you can use spTransform > >>from the rgdal pacakge to perform the projection. spTransform uses > the proj4 > >>library. You need to find the so called proj4 strings describing > both the > >>source and target projection. > >> > > > >There seems to be several ways of reprojecting/coordinate > transforming in R... > > > >package:sp, in ?is.projected, mentions an spproj package which I > >can't find. Is that just a documentation error?... > > Documentation error, will be corrected. > > > > >package:rgdal has spTransform as mentioned... > > > > Correct, a good deal based on your work for vector data and projection. > > >package:proj4 seems to be an independent interface to the PROJ4 library. > > > > Odd and unhelpful, a one-off attempt to replace mapproj, which works > together with the maps package, but has unclear license conditions. > This package doesn't interface with any other spatial packages, and > the author has never replied to questions about coordinating to get > rgdal on CRAN as an OSX binary package. Use proj4 or maptools is you > must, rgdal for preference - spproj was a development vehicle for > methods that are now in rgdal. > > Roger > > >Barry > > > >_______________________________________________ > >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