This concerns a draft package not on CRAN, perhaps better discussed off list for now. Could you please attach a few example points for me to look at, and details of your R version and the proj4 library version you are using? What happens when you run proj from the command line?
Roger Bivand On Mon, 10 May 2004, Slist wrote: > Hi all! > > I am trying to project coordinates collected by GPS collars. The data is in > decimal degrees and provides locations for two Sable antelope running > around in Kruger NP South Africa. > > After a wide search it seems that proj4R provides most options for > projection of coordinates. However I can not get around the following error > message when I try to project my coordinates using the Albers Equal Area > Conic projection. > > According to the proj4 pages, the following parameters should be supplied: > http://www.remotesensing.org/geotiff/proj_list/albers_equal_area_conic.html > PROJ.4 Organization > +proj=aea +lat_1=Latitude of first standard parallel > +lat_2=Latitude of second standard parallel > +lat_0=Latitude of false origin > +lon_0=Longitude of false origin > +x_0=Easting of false origin > +y_0=Northing of false origin > > But when running the command in R, I get the following error message > > > library(proj4R) > > > > res <- project(cbind(x, y), "+proj=aea +lon_0=24 +lat_0=0 +lat_1=18s > +lat_2=32s +x_0=0 +y_0=0 ") # > Error in project(cbind(x, y), "+proj=aea +lon_0=24 +lat_0=0 +lat_1=18s > +lat_2=32s +x_0=0 +y_0=0 ") : > major axis or radius = 0 or not given > > > > I have also tried: > > res <- project(cbind(x, y), "+proj=aea +lon_0=24 +lat_0=0 +lat_1=-18 > +lat_2=-32 +x_0=0 +y_0=0 ") # > with the same error. > > Any suggestions? > > Thanks, > > Sander. > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > -- Roger Bivand Economic Geography Section, Department of Economics, Norwegian School of Economics and Business Administration, Breiviksveien 40, N-5045 Bergen, Norway. voice: +47 55 95 93 55; fax +47 55 95 93 93 e-mail: [EMAIL PROTECTED] ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html