In the geosphere package on R-Forge there are a number of distance functions (from law of cosines to more complex) as well as related spherical trig functions, such as computing paths along a great-circle. There is also pointDistance in the raster package.
Robert On Thu, Jan 14, 2010 at 1:27 AM, Karl Ove Hufthammer <k...@huftis.org> wrote: > Dear list members > > I have found three functions for calculating the distance between > geographical points, 'geo.dist' in the 'oce' package, 'rdist.earth' in > the 'fields' package, and 'spDistsN1' in the 'sp' package. They all give > slightly difference answers, so my question is: which of them is best, > i.e., gives the most accurate answer? > > When it comes to performance, the 'rbenchmark' package shows that (at > least on calculating a single distance), 'spDistsN1' is the fastest, > 'geo.dist' takes twice as long, and 'rdist.earth' takes about five times > as long (as 'spDistsN1'). > > -- > Karl Ove Hufthammer > > _______________________________________________ > R-sig-Geo mailing list > R-sig-Geo@stat.math.ethz.ch > https://stat.ethz.ch/mailman/listinfo/r-sig-geo > _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
