| Re: Following a ridgeline [message #60895 is a reply to message #60893] |
Mon, 16 June 2008 13:15   |
mzagursk@gmail.com
Messages: 9
Registered: June 2008
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Junior Member |
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On Jun 16, 12:49 pm, David Fanning <n...@dfanning.com> wrote:
> mzagu...@gmail.com writes:
>> I've got a 2d map (let's say it's a contour map of a mountain). I
>> need to be able to 'detect' and 'follow' the ridgeline across the
>> whole mountain (which does about a 180 degree turn as well, it's U
>> shaped). Anyone know any way to accomplish this?
>
>> So far, i've attempted to start at the maximum point, and then look
>> for surrounding points that minimizes the downward slope, this
>> process, however, creates switchbacks at peaks and doesnt follow the
>> peak down along a ridge. Any ideas?
>
> The obvious idea is the WATERSHED function. Have you
> tried that?
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming:http://www.dfanning.com/
> Sepore ma de ni thui. ("Perhaps thou speakest truth.")
Yes, but I'm not sure how to implement it in such a way to output the
ridge. This 'image' is simply a background of 0's with a single
ridgeline rising out of it. When I use watershed, it give me bogus
answers, lines that make no sense at all.
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