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Re: Following a ridgeline [message #60891 is a reply to message #60890]

Tue, 17 June 2008 02:01

Peter Clinch
Messages: 98
Registered: April 1996

Member

Kenneth P. Bowman wrote:

> You could look for the maximum curvature of the contour lines.
> It might be necessary to add some non-artificial intelligence to
> get the final result the way you want.

As a keen hillwalker, orienteer and skier who often needs to do this it
got me thinking... I think Ken's idea is probably a good way.

One thing the nAI will particularly have to look for is gullies right
next to the ridges which may have sharp contour curves too, but the
other way. Perhaps check the direction of successive "arrowheads"
against one another and make sure they haven't spun through too big an
arc (180 degrees would certainly suggest you've Got It Wrong...). That
might also be a way to decide which side of a bifurcation you'd follow.

But I haven't got anything as useful as an algorithm that actually tells
you /how/ :-(

Pete.
--
Peter Clinch Medical Physics IT Officer
Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net p.j.clinch@dundee.ac.uk http://www.dundee.ac.uk/~pjclinch/

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[Message index]

		Re: Following a ridgeline By: Jelle on Wed, 18 June 2008 11:10
		Re: Following a ridgeline By: Jelle on Wed, 18 June 2008 11:02
		Re: Following a ridgeline By: Juggernaut on Wed, 18 June 2008 09:14
		Re: Following a ridgeline By: Jean H. on Wed, 18 June 2008 08:55
		Re: Following a ridgeline By: Jelle on Wed, 18 June 2008 01:52
		Re: Following a ridgeline By: Jean H. on Tue, 17 June 2008 10:14
		Re: Following a ridgeline By: RJA on Tue, 17 June 2008 02:20
		Re: Following a ridgeline By: Peter Clinch on Tue, 17 June 2008 02:01
		Re: Following a ridgeline By: Jelle on Mon, 16 June 2008 16:14
		Re: Following a ridgeline By: Kenneth P. Bowman on Mon, 16 June 2008 12:37
		Re: Following a ridgeline By: mzagursk@gmail.com on Mon, 16 June 2008 13:34
		Re: Following a ridgeline By: karo03de on Mon, 23 June 2008 00:50
		Re: Following a ridgeline By: mzagursk@gmail.com on Mon, 16 June 2008 13:15
		Re: Following a ridgeline By: David Fanning on Mon, 16 June 2008 12:49
		Re: Following a ridgeline By: Mike[2] on Tue, 24 June 2008 08:53

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