On Monday 08 February 2010, Karl Ove Hufthammer wrote: > On Sun, 7 Feb 2010 17:30:23 -0800 Dylan Beaudette > > <dylan.beaude...@gmail.com> wrote: > > How about an equal-area map projection? > > > > http://en.wikipedia.org/wiki/Map_projection#Equal-area > > Good idea. This will easily give you correct relative area measures, > which will often be sufficient. > > But how to convert these into absolute measures, for example, the area > in km²? Any known conversion factors for the equal-area projections > available in 'spTransform'?
Most equal area map projections use meter as the linear unit of measure. Cheers, Dylan -- Dylan Beaudette Soil Resource Laboratory http://casoilresource.lawr.ucdavis.edu/ University of California at Davis 530.754.7341 _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
