[AniMov] k-NNCH Development

Lichti, Nathanael I nlichti at purdue.edu
Wed Jul 19 15:39:43 CEST 2006

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.
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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Today's Topics:

   1.  k-NNCH Development (Scott Fortmann-Roe)


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
        <f18f141c0607180926h5b7cbaadjfb8bc63c7895c78a at mail.gmail.com>
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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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