Alexis wrote: > Can anyone tell me why I would get different average nearest neighbor values > for the same set of coordinates between ArcGIS 10 and R? Sometimes the > difference in distance is over 1.3 km.
spatstat::nndist calculates Euclidean distances rather than distances along the earth's surface, which is probably what you're getting from AG. A very short example illustrating the problem would be helpful in determining if I'm at all right; on the other hand I'm glad you're testing your results. You might peek at the current thread "Geographic distance between lat-long points in R" for more information. cur -- Curt Seeliger, Data Ranger Raytheon Information Services - Contractor to ORD seeliger.c...@epa.gov 541/754-4638 [[alternative HTML version deleted]] ______________________________________________ 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.