[R-sig-Geo] [AniMov] Calculating spatial overlap using kerneloverlap() in adehabitat

[Clement Calenge]

Dear Leila

I already replied to your question on Animov [1]. Please avoid 
cross-posting and continue there if any additional help is required. You 
may want to read the R posting guide [2], too.

Clément.

[1] http://lists.faunalia.it/pipermail/animov/2012-October/000868.html

[2] http://www.r-project.org/posting-guide.html


On 10/01/2012 07:03 AM, Leila Brook wrote:
>
> Hi,
>
> Sorry again for cross-postings...
>
> I have a couple of further questions on calculating spatial overlap in 
> adehabitat. I apologise if these questions are pretty evident - I'm 
> still learning the ropes. I want to calculate home range overlap for 
> both classical kernel density home ranges, and also for biased random 
> bridge home range estimates.
>
> I am trying to use the kerneloverlap() function, but have a couple of 
> issues:
>
> Does anyone know of a way to combine different estUD files into an 
> estUDm for this function?
>
> I've calculated the BRB kernels with different parameters (for 
> different species), so I'd like to calculate individual-specific 
> kernels prior to calculating overlap.
>
> Secondly, when I do get estimates of UDOI overlap, they appear a bit 
> strange, given the home range contours. I am getting some huge 
> estimates (>10 for some animals with 95% contours that don't touch) 
> and quite low estimates (~0.1) for situations where a HR is completely 
> inside another. Does anyone have any suggestions or references that 
> can point me in the right direction on this one?
>
> Thanks,
> Leila Brook
>


-- 
Clément CALENGE
Cellule d'appui à l'analyse de données
Direction des Etudes et de la Recherche
Office national de la chasse et de la faune sauvage
Saint Benoist - 78610 Auffargis
tel. (33) 01.30.46.54.14