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From: Matt J on 10 Aug 2010 14:38
Peter Simon <psimon0420(a)gmail.com> wrote in message <fa50d04e-7937-4f10-ac52-21603a3f9230(a)t20g2000yqa.googlegroups.com>...

>
> If anyone is interested in seeing my dataset along with the boundary
> curve determined by us's routine ashape.m, I've posted the image at
> http://users.vcnet.com/simonp/matlab/conus_alphashape.pdf
========

Looks like you're missing Maine and Michigan
From: Sean on 10 Aug 2010 15:10
"Matt J " <mattjacREMOVE(a)THISieee.spam> wrote in message <i3s6ac$804$1(a)fred.mathworks.com>...
> Peter Simon <psimon0420(a)gmail.com> wrote in message <fa50d04e-7937-4f10-ac52-21603a3f9230(a)t20g2000yqa.googlegroups.com>...
I've posted the image at
> > http://users.vcnet.com/simonp/matlab/conus_alphashape.pdf
> ========
>
> Looks like you're missing Maine and Michigan

Does that mean that us central to northern Mainers are now _actually_ part of Canada?
From: Walter Roberson on 10 Aug 2010 15:10
Matt J wrote:
> Peter Simon <psimon0420(a)gmail.com> wrote in message
> <fa50d04e-7937-4f10-ac52-21603a3f9230(a)t20g2000yqa.googlegroups.com>...
>
>>
>> If anyone is interested in seeing my dataset along with the boundary
>> curve determined by us's routine ashape.m, I've posted the image at
>> http://users.vcnet.com/simonp/matlab/conus_alphashape.pdf
> ========
>
> Looks like you're missing Maine and Michigan

And Wisconsin is kinda wonky.
From: ImageAnalyst on 10 Aug 2010 15:22
Like John says, alpha shapes might work for you. Here is a File
Exchange submission on them:
http://www.mathworks.com/matlabcentral/fileexchange/6760-ashape-a-pedestrian-alpha-shape-extractor
There was also a thread in this newsgroup a few months ago from a guy
who was using them to find the outline of a fish. It's worth looking
up.

Here's some tutorial links on alpha shapes:
http://www.mathworks.com/matlabcentral/fileexchange/6760-ashape-a-pedestrian-alpha-shape-extractor
http://biogeometry.duke.edu/software/alphashapes/index.html
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