[AniMov] LoCoH isopleths intervals... to e.g. 5%?

Henrik Lundqvist h.lundqvist at gmail.com
Fri Feb 12 10:05:23 CET 2010


Thanks Clément, well appreciated

/Henrik


___________________________
Henrik Lundqvist
h.lundqvist at gmail.com
henrik.lundqvist at huv.slu.se


2010/2/12 Clément Calenge <clement.calenge at oncfs.gouv.fr>

> Hello Henrik,
>
> Henrik Lundqvist wrote:
>
>> I got a question regarding the k-NNCH or LoCoH funktion in Adehabitat for
>> calculating homeranges.
>> The default setting regaring the isopleths are 10% steps as follows:
>> c(100,90,80,70,60,50,40,30,20,10)
>> Is there a parameter I can change to achieve 5% steps (or other
>> configuration)? I can't find it in the arguments of the function. There
>> seems to be a possibility to set more intervals in the ArcGIS-plugin at:
>> http://nature.berkeley.edu/~alyons/locoh/arcgis9/index.html <
>> http://nature.berkeley.edu/%7Ealyons/locoh/arcgis9/index.html>
>>
>> I guess I have to engage with the code of NNCH.R, but when I try (the
>> R-guru that I'm not) I get errors.
>> Couldn't it be coded as an argument of the function? Would be neat...
>>
>
> Actually, the function NNCH returns an object of class "NNCH" containing
> all possible isopleths that can be built with a given dataset. Then, other
> functions are used to "extract" given isopleths. For example, if you want to
> compute the home range size for isopleth 95%, you have to set the argument
> percent = 95 in the function NNCH.area. Or, if you want the home range sizes
> for isopleths 100 to 50% by 5% steps, you have to set: percent =
> rev(seq(50,95, by=5)) in the function NNCH.area. Similarly, if you want to
> plot the 95% home range, you have to set percent=95 in the function
> plot.NNCH. etc.
> Have a look at the argument percent on the help pages of plot.NNCH, and
> NNCH.area.
> Hope this helps,
>
> Clément Calenge
>
> --
> Clément CALENGE
> Cellule d'appui à l'analyse de données
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