If you would like to convert the entire shapfile check out GDAL: http://www.gdal.org/
http://casoilresource.lawr.ucdavis.edu/drupal/node/98 Cheers, Dylan On Tuesday 19 August 2008, Werner Wernersen wrote: > It would be nicer to convert directly the entire shapefile object to > long/lat coordinates but if that is not possible, I will convert the other > points to UTM. Hence, I am playing around with rgdal. > > library(rgdal) > SP <- SpatialPoints(cbind(32.29252, -0.3228500), > proj4string=CRS("+proj=longlat")) > spTransform(SP, CRS("+proj=utm +zone=36")) > > > spTransform(SP, CRS("+proj=utm +zone=36")) > > SpatialPoints: > coords.x1 coords.x2 > [1,] 421274.4 -35687.37 > Coordinate Reference System (CRS) arguments: +proj=utm +zone=36 > +ellps=WGS84 > > This result corresponds with what I get when using convUL() but my map of > that area in UTM coordinates does not extend to the negative. An external > program converts the point to x=420994 y=9964407 which also seems correct > with respect to the map. Fore sure, I am using the function wrongly > somehow. Can anyone give me a hint? > > That's very much appreciated! > > Thanks, > Werner > > > > ----- Ursprüngliche Mail ---- > Von: Werner Wernersen <[EMAIL PROTECTED]> > An: [EMAIL PROTECTED] > Gesendet: Dienstag, den 19. August 2008, 20:28:29 Uhr > Betreff: converting coordinates from utm to longitude / latitude > > Hi, > > is there a function in R to convert data read with read.shape and which is > originally in UTM coordinates into longitude / latitude coordinates? I > found the convUL() function from the PBSmapping package but I have no idea > how I could apply that to the read.shape object. > > Many thanks, > Werner > > > ______________________________ > fügt über einen herausragenden Schutz gegen Massenmails. > http://mail.yahoo.com > > > __________________________________________________ > Do > ragenden Schutz gegen Massenmails. > http://mail.yahoo.com > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html and provide commented, minimal, > self-contained, reproducible code. -- Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of California at Davis 530.754.7341 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
