[AniMov] problem with getverticeshr at >85%

Corrie Curtice cc157 at duke.edu
Wed Jul 28 15:17:55 CEST 2010


On Wed, Jul 28, 2010 at 2:35 AM, Anne Ghisla <a.ghisla at gmail.com> wrote:
> On Tue, 2010-07-27 at 15:27 -0400, Corrie Curtice wrote:
>> Hello,
>>
>> I am trying to export the home range for a single individual animal.
>> I'm getting the error  "Error in re[[i]] : subscript out of bounds" --
>> I looked on the archive and found my own posting of this question for
>> the 100% isopleth. :)  So now I'm wondering, why does the error occur
>> at lower isopleth levels? Ideally I would like the 95% KHRE to show
>> the "home range" of each animal, and this works with all other
>> individuals.  The answer to my last posting noted that the isopleth
>> went beyond the grid limits.   I'm not passing in an underlying grid.
>> Here's my call:
>>
>>     ud <- kernelUD(xy, grid=100, h="href")
>>     kvtmp <- getverticeshr(ud, lev = 95)
>>
>> Levels up to 85 work fine.  Is there anything I can do to fix this, if
>> not what is the proper way to report the result for this animal? If
>> you need more code or output I can send.
>
> Hi Corrie,
>
> it sounds like the issue reported here:
>
> https://trac.faunalia.it/animove/ticket/13
>
> does your dataset show anisotropy? The one attached to the ticket is a
> narrow cloud of points along a horizontal line. The default grid created
> by kernelUD is likely not able to encompass the whole UD. If the case, I
> would try creating a wider grid and providing it to kernelUD.
>
> hope this helps!

Yes, that's exactly it.  I tried increasing the value passed into the
grid parameter -- is this right?  Is there some way to determine what
the correct value would be?

Thanks!

Corrie


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