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
Office national de la chasse et de la faune sauvage
Saint Benoist - 78610 Auffargis
tel. (33) 01.30.46.54.14
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