On Thu, 4 Mar 2004, Mark Van De Vyver wrote: > Hi, > Could any one point me to the projection, and parameters if necessary, that > would show each country/continent with it's area accurately refelcted on the > plot? E.g. aitoff vs. albers vs. bonne vs. cylequalearea vs. guyou - they > don't all look the same to mee but some of the documentations suggests they > are equal area? Of course this isn't my field, so I am largely guessing and > am prorbably making some naive assumptions :) > I'm pretty sure this is on the R-help archive but I don't seem to be able to > access most of the posts that the search returns - I keep getting a 'file > not found' page...
One of the best online resources is the collection of documentation links at: http://www.remotesensing.org/proj The manual has figures with examples of projections. GMT also has projection documentation: http://gmt.soest.hawaii.edu/ The printed resources, which are well worth consulting, are: John P. Snyder (1987) Map projections - a working manual, USGS professional paper 1395; Lev M. Bugayevskiy and John P. Snyder (1995) Map projections - a reference manual (London, Taylor & Francis). The field is quite extensive, and most often a choice that is "right" for one use will not be for another. Even measuring area accurately in the field is bad enough, but representing it on a flat 2D surface has challenged people for a long time and will certainly continue to do so (cartography is an interesting part of graphic visualisation!). > TIA > Mark > > ______________________________________________ > [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
