[R-sig-Geo] Using BA to estimate home range overlap

Clément Calenge clement.calenge at oncfs.gouv.fr
Wed Feb 9 18:25:24 CET 2011

> My code is fairly straightforward:
> xy<-locations[,c('Easting','Northing')]
> id<-locations[,c('Code')]
> overlap<-kerneloverlap(xy, id, "BA", 65)
> But the results are surprising: in particular, some pairs of 
> individuals have an overlap greater than one- up to above 2 in some 
> cases. Can anyone explain to me why this might be?

This is rather strange indeed. I read the code again, but I did not find 
any bug in the implementation of the function. Could you send a 
reproducible example (e.g. two animals characterized by a BA index > 1), 
to have a better idea of what happens?
Best regards,

Clément Calenge

Cellule d'appui à l'analyse de données
Direction des Etudes et de la Recherche
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