distance units in "zerodist" function (sp)
Good point, thanks! zerodist computes Euclidian distances, meaning you should use have projected coordinates to do something useful at the poles. I'll put it on the TODO list to compute great circle distances when data are in long lat, hopefully for the next sp, which might come out pretty soon. Best regards,
On 06/27/2013 05:17 AM, Parra, Mauricio (AGPM) wrote:
Hi everyone, I would like to know how the distance for "zero" parameter in zerodist/remove.duplicates function (sp package) should be entered when coordinates for SpatialPoints are in lat/long. Function documentation has no mention about you have to use either map units (decimal degrees for lat/long) or in all cases meters. Thanks in advance, Sincerely, Mauricio
_______________________________________________ R-sig-Geo mailing list R-sig-Geo at r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
Edzer Pebesma Institute for Geoinformatics (ifgi), University of M?nster Weseler Stra?e 253, 48151 M?nster, Germany. Phone: +49 251 83 33081, Fax: +49 251 8339763 http://ifgi.uni-muenster.de