map projections
On Fri, 20 Apr 2001, Bernie McConnell wrote:
Can you please tell me if there is R code for geographic projections? ie lat,lon -> x,y metres. I'm principally interested in Mercator and Lambert Equal Area Azimuthal. Failing R code - code in any language!
One good source is http://www.remotesensing.org/proj/ for the PROJ.4 software. Another is the mapproject program in GMT at http://gmt.soest.hawaii.edu/. These are both external to R, but it seems likely that PROJ.4 will form part of an R map package at some stage. You didn't say which platform you use - both these are native Unix/Linux, but at least GMT is available for NT too. While it would be possible to write R code to do this, both of these sources are well-tried and so more likely to work as expected. Roger
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: Roger.Bivand at nhh.no and: Department of Geography and Regional Development, University of Gdansk, al. Mar. J. Pilsudskiego 46, PL-81 378 Gdynia, Poland. -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._