[R-sig-Geo] Using BA to estimate home range overlap
Katie Stopher
katie.stopher at ed.ac.uk
Wed Feb 9 17:42:46 CET 2011
Hello,
I am trying to use kerneloverlap from adehabitat to estimate overlap
between the home ranges of red deer. For what I want to use the home
range overlap for, I would like the overlap to take into account the UDs
of the animals, but also to range between 0 and 1. From my reading of
Fieberg and Kochanny (2005), using the BA method should do this.
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?
Many thanks, and my apologies if I have missed something obvious in my
reading of the help pages!
Thanks,
Katie Stopher
--
Katie Stopher
PhD Student, Wild Evolution Group,
Institute of Evolutionary Biology,
University of Edinburgh,
King's Buildings,
West Mains Road,
Edinburgh,
EH9 3JT
http://wildevolution.biology.ed.ac.uk/jpemberton/KatieStopher2.html
--
Katie Stopher
PhD Student, Wild Evolution Group,
Institute of Evolutionary Biology,
University of Edinburgh,
King's Buildings,
West Mains Road,
Edinburgh,
EH9 3JT
http://wildevolution.biology.ed.ac.uk/jpemberton/KatieStopher2.html
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