Dear list,

I have GPS locations (X, Y) for several groups of lions that I grouped into
a  single data frame with pride name, coords, and number of individuals per
pride. I have the same number of GPS location for all lion prides.

pride.name     X     Y     pride.size
    A               x1   y1        10
    A              x2    y2        10
    A              ...     ...        10
    A              ...    ....        ...
    B             ...     ....        7
    B             ...      ...        7
    B
    ...
    ...
    ...

What I want to calculate is a utilization distribution map for the lions
(following the landscape of fear concept) where to each pixel there is an
associated encounter likelihood value.
Prides vary in size and I am therefore looking at a method that will enable
me to weight the kernels for pride size. Surely a larger pride will have an
overall larger effect within the landscape of fear that a smaller pride
(let's assume they have the same territory size).
This calculation can for example been done in ArcGIS using the Hawth tools
extension but I am trying to move from GIS to R to avoid jumping back and
forth.
In the past I have been using kernelUD in the adehabitat package for other
purposes but at that time I did not need to weight my kernel by group size.
I have been looking online but I do not seem to be able to find a function
that enables me to weights for group size.

I would appreciate if someone could tell me if there is a particular
package and function to calculate the kernels which allows weighting for
group size and that also allow to change smoothing parameters (LSCV BCV and
so on)


Thanks in advance,
Gabriele

-- 
Botswana Predator Conservation Trust
Gabriel Cozzi
Private Bag 13
Maun - Botswana
E-mail: gab.cozzi@gmail.com
Mobile: +26774259312


Institute of Environmental Sciences
Gabriel Cozzi
Zurich University
Winterthurerstr. 190
8057 Zurich - Switzerland
E-mail: gab.cozzi@uwinst.uzh.ch
Phone: ++4(0)446355204
Fax: ++41(0)16355711
http://www.uzh.ch/uwinst
http://african-carnivores.com

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