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Can the underlying algorithm used in CONTOUR be accessed somehow? [message #90845]

Mon, 27 April 2015 22:18

Matt Francis
Messages: 94
Registered: May 2010

Member

I need a quick and dirty contour finding algorithm, but I actually need the contour paths as data (i.e. rather than just plotting them on an image). The algorithm that CONTOUR uses would be fine, but I can't see that this can be called independently to return some data describing the contour path.

Is there some other contour finding implementation out there?

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Re: Can the underlying algorithm used in CONTOUR be accessed somehow? [message #90846 is a reply to message #90845]

Mon, 27 April 2015 22:48

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Bogdanovist writes:

> I need a quick and dirty contour finding algorithm, but I actually need the contour paths as data (i.e. rather than just plotting them on an image). The algorithm that CONTOUR uses would be fine, but I can't see that this can be called independently to return some data describing the contour path.
>
> Is there some other contour finding implementation out there?

Try the IsoContour procedure.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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Re: Can the underlying algorithm used in CONTOUR be accessed somehow? [message #90847 is a reply to message #90845]

Mon, 27 April 2015 23:22

Fabzi
Messages: 305
Registered: July 2010

Senior Member

On 04/28/2015 07:18 AM, Bogdanovist wrote:
> but I can't see that this can be called independently to return some data describing the contour path.

Isn't that what you want?

Contour, data, PATH_INFO=info, PATH_XY=xy, XSTYLE=1, $
YSTYLE=1, /PATH_DATA_COORDS

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