[R-sig-Geo] adehabitatHR: combining estUD for kerneloverlaphr

[Anthony Fischbach]

I wish to examine indices of home-range overlap of utitilzation distributions
generated by differing home-range estimating methods.

The *adehabitatHR* function *kerneloverlaphr* acts on an object of class
estUDm containing several home-ranges for which the overlap is to be
calculated.

Is there handy way to 'stack' several home-ranges calculated by various
methods into a single estUDm object such that the resulting estUDm object
may be handled by kerneloverlaphr?

Example code: 
require(adehabitatHR)

data(buffalo)  ## Example dataset used by Benhamou (2011)

## Example estUDm objects gererated as per the example provided in
adehabitatHR (v 0.4.2).
id <- BRB(buffalo$traj, D = 440/60, Tmax = 3*3600, Lmin = 50, type = "ID",
         hmin=100, radius = 300, maxt = 2*3600, activity="act",
filtershort=FALSE,
         grid = 200, extent=0.1)

rd <- BRB(buffalo$traj, D = 440/60, Tmax = 3*3600, Lmin = 50, type = "RD",
         hmin=100, radius = 300, maxt = 2*3600, activity="act",
filtershort=FALSE,
         grid = 200, extent=0.1)

ud <- BRB(buffalo$traj, D = 440/60, Tmax = 3*3600, Lmin = 50,
         hmin=100, radius = 300, maxt = 2*3600, activity="act",
filtershort=FALSE,
         grid = 200, extent=0.1)

x<-* 'Special stacking function'*(id, rd, ud)  ## Here is what I am wanting. 
Is it possible?
kerneloverlaphr(x, method='VI')



-----
Tony Fischbach, Wildlife Biologist
Walrus Research Program
Alaska Science Center
U.S. Geological Survey
4210 University Drive
Anchorage, AK 99508-4650

AFischbach at usgs.gov
http://alaska.usgs.gov/science/biology/walrus
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