[AniMov] k-NNCH Development

Scott Fortmann-Roe scottfr at gmail.com
Wed Jul 26 01:23:38 CEST 2006


Hi Nate,

I have added ArcGIS polygon shapefile exporting of isopleths into the
NNCH script.

Would you still like to have an option to export ascii raster files?

If so, please email me your current script on it, it would be a useful
springboard.

-Scott

On 7/19/06, Lichti, Nathanael I <nlichti at purdue.edu> wrote:
> Hi Scott,
>
> I have been using k-NNCH some recently.  Your suggested revisions sound very useful, particularly an automated method for running multiple k-values.  What I would really like to see is a function that efficiently converts the UD created by k-NNCH into an ascii density raster, as is output by KernelUD.  Ascii output should allow easier importation to GIS packages and comparison to other map layers.  I wrote a script to do this, but my current solution is pretty ugly and takes a long time to run (several hours, with my dataset).  I'd be happy to send you my script if you think it would be useful.
>
> cheers,
>
> Nate
>
> --
> Nathan Lichti
> Graduate Research Assistant
> Forestry and Natural Resources
> Purdue University
> 715 W State Street
> West Lafayette IN 47907-2061
> (765) 494-9597
> nlichti at purdue.edu
>
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>    1.  k-NNCH Development (Scott Fortmann-Roe)
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> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 18 Jul 2006 09:26:35 -0700
> From: "Scott Fortmann-Roe" <scottfr at gmail.com>
> Subject: [AniMov]  k-NNCH Development
> To: animov at faunalia.com
> Message-ID:
>         <f18f141c0607180926h5b7cbaadjfb8bc63c7895c78a at mail.gmail.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hi,
>
> I am working at the Getz lab in UC Berkeley to extend and improve the
> k-NNCH script included with AniMov. The k-NNCH method (also known as
> LoCoh) has several advantages over other methods of home range
> determination (such as Minimum Convex Polygon and kernel methods) as
> it handles 'sharp'  terrain such as lakes and fences very well and
> converges to the true area represented by the data as the number of
> data points increase.
>
> I would like to get some feedback from the community about this development:
>
> a) Is there anyone else actively working on the k-NNCH script? I don't
> want to step on anyone's toes.
>
> and b) What features would the community find useful in an enhanced
> script? Currently mooted plans include creating an R GUI using tcltk;
> implementing some form of ArcGIS integration; and making the basic R
> script more powerful with, for instance, the ability to automatically
> try out different values of k to locate critical boundary points that
> radically change home range coverage.
>
> We are very open to adding other features to the script that you would
> find useful. Just let us know what they are!
>
> Any feedback on development would be greatly appreciated.
>
> -Scott Fortmann-Roe
>
>
>
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