[R-sig-eco] problem with kernel UD estimation using adehabitatHR

[André Zehnder]

Hi dmaa,

I got this error when I used too low grid values to quickly checked the
results. Try different values for the "grid" parameter (e.g. grid=450).

In addition, the extent values of alittle seem to be rather high. As I
understand it (and please correct me if I am wrong), the extent is a factor
that defines by how much percent of the range of coordinates included in a
dataset is extended, so that the UD is not cut off too early. For example:
If the bounding box around your coordinates is 300x300 km, a extent of 0.1
would expand this area by 10% (in total 330x330 km). Therefore, unless you
have enormously high smoothing parameters and/or tiny home ranges to expect,
extents of 0.1–0.5 will be enough.

About the area issue: Are the differences large or so small that they are
negligible and possibly only a result of different precisions? Another
reason could be that one of the two methods considers holes and subtract
their areas while the other does not.

Best regards,
André

-----Ursprüngliche Nachricht-----
Von: R-sig-ecology [mailto:r-sig-ecology-bounces at r-project.org] Im Auftrag
von dmaa
Gesendet: Montag, 13. Juli 2015 13:48
An: r-sig-ecology at r-project.org
Betreff: Re: [R-sig-eco] problem with kernel UD estimation using
adehabitatHR

Any news on this? I'm having a similar problem.

In addition,
kernel.area(x,percent=c(50,95),unout="m2",standardize=F) provides different
area values when compared with those obtained by using getverticeshr(kudvej,
95,unout="m2")



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