[R-sig-Geo] sp and adehabitatHR: combine UDs

[Mathieu Basille]

Hi Ena,

I'm not sure I completely understand what you want to achieve, but did you
consider using a pre-defined grid (i.e. SpatialPixels) to constrain the
output? See the help from '?kernelbb':

    grid: a number giving the size of the grid on which the UD should
          be estimated.  *Alternatively, this parameter may be an object
          of class 'SpatialPixels'*, or a list of objects of class
          'SpatialPixels', with named elements corresponding to each
          level of the factor id

Hope this helps,
Mathieu.


Le 14/10/2015 09:11, Vv a écrit :
> Hello list,
> I wonder if there already exists a solution on how to combine UDs.
> My intention is to create a reference UD for Mon, Tue, ...., Sun - thus, 7 
> reference UDs.
> Hence, I compute for each Monday within my data the Brownian bridge home range.
> I do not use the byburst function because I use different grid parameters.
> Then I would like to (maybe) average all the estimated UDs for Mondays and 
> create one single estUD or SpatialPixelsDataFrame.
> (To recreate an estUD would be awesome because then I could use getverticeshr to 
> estimate the home range.)
> I tried to figure out an example:
> library(adehabitatHR)
> library(maptools)
> data(puechcirc)
> 
> dOne<-puechcirc[1]
> dTwo<-puechcirc[2]
> tata1<-kernelbb(dOne, sig1=6.23, sig2=58, grid=50)
> tata2<-kernelbb(dTwo, sig1=3.72, sig2=58, grid=80)
> The goal should be to generate an extended averaged UD out of the two.
> I've already tried spRbind but of course it just returned the positions but not 
> the data within the pixels.
> I also think that the different grid cell size could be challenging but for my 
> data I have not find a better way
> to achieve ~50 meters cell size than to align the grid parameter on the data.
> I would appreciate any help :)
> Best, Ena
> (Of course I will send you the solution if I find one)
> 
> 
> 
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Mathieu Basille
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