[R-sig-Geo] great circle distances

[A.P.B. Carneiro]

Hi

I need to calculate the average nearest neighbor distance between nests 
coordinates (lat/long). However, I would like to use the great circle 
distances in spite or Euclidian distances. Is it possible to do this in 
ArcGis 10?

Thank you for your attention,

Ana

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PhD student
Evolutionary Ecology Group
Department of Zoology
University of Cambridge