If your goal is to get the distance between geographic points, you might try computing the distance along the "great circle arc" and forget about projection. Several packages have functions that do this. See https://stat.ethz.ch/pipermail/r-help/2007-October/144546.html.
hope that helps, Ian Tim Clark wrote: > > > Dear List, > > I am trying to determine the speed an animal is traveling on each leg of a > track. My data is in longitude and latitude, so I am using the package > rgdal to convert it into a spatial points data frame and transform it to > UTM. I would then like to find the difference between successive > longitudes and latitudes, find the euclidean distance between points, and > compute the speed of the animal on each leg. > > [ removed from quote ] > > Aloha, > > Tim > > > > Tim Clark > Department of Zoology > University of Hawaii > > > -- View this message in context: http://www.nabble.com/Calculating-distance-between-spatial-points-tp24212875p24220923.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
