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.curt@epa.gov
541/754-4638

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