Hi Tim,
Perhaps you should try the adaptive local convex hull
method proposed by Wayne Getz (Getz WM, Fortmann-Roe S, Cross PC, et al. (2007)
LoCoH: nonparametric kernel methods for constructing home ranges and
utilization distributions. PLoS ONE 2: e207. doi:
10.1371/journal.pone.0000207). It seems to
represent home range use much better than kernels, and you don't have
the awkward business of chosing the right bandwidth (Huck M, Davison J and
Roper TJ (2008) Comparison of two sampling protocols and four home range
estimators using radio-tracking data from urban badgers. Wildl Biol 14:
467-477). The only problem:
If you have many data points it might take lots of time. In adehabitat
LoCoHs are called NNCH.
Good luck,
Maren
------------------------
Maren Huck
Mammal Research Institute
Polish Academy of Sciences
Waszkiewicza 1
17-230 Białowieża
Poland
tel: +48-85-682 7781
some nepotistic links:
http://www.Myspace.com/steensolobasshttp://www.nellyboyd.org/http://estudioviabrasil.wordpress.com/
> Date: Sun, 12 Jul 2009 12:37:23 -0700
> From: [email protected]
> To: [email protected]
> Subject: [AniMov] Clipping area from home range estimates
>
>
> Dear List,
>
> I am trying to use Adehabitat to analyze the home range and movement patterns
> of fish (manta rays, sharks, and various species of reef fish) in Hawaii, but
> have not found a way to clip land area out of the animals home range. Most
> of the fish I study stay fairly close to shore, moving along a sinuous
> coastline. I have used adehabitat to estimate their home range (I am mostly
> interested in kernel HR's), but need to either limit the calculations to only
> include water areas during the calculation or clip out the land area after
> the kernel has been calculated. Is there a way to use a shapefile or other
> projected map file to either limit the kernel or to clip out the area
> post-processing? I am fairly new to R and adehabitat, and am working in
> Windows.
>
> Thanks for your help,
>
> Tim
>
> Tim Clark
> Department of Zoology
> University of Hawaii
>
>
>
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