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Re: closed contour paths: clockwise or anticlockwise - or actually a mixture? [message #87070 is a reply to message #87069]

Fri, 03 January 2014 13:01

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

George.millward@yahoo.com writes:

>
> Hi there,
>
> I'm doing some very straightforward contour plotting - but instead of actually plotting the contours - I'm writing out the path data of closed contours by using the path_info and path_xy keywords.
>
> This is all working fine, but I have a problem: Some of the contour paths (written out as x,y arrays) close in a clockwise order, some close in an anticlockwise order. This is causing trouble when I export the paths to other mapping software because the latter is strictly wanting the paths to always be clockwise.....

This seems unlikely. Are you sure you are not confusing the high and low
contours? In other words, one path describes a mound, the other path
describes a hole. The normal should be pointing toward you in the
counterclockwise (mound) contour, and away from you in the clockwise
(hole) contour.

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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[Message index]

		closed contour paths: clockwise or anticlockwise - or actually a mixture? By: George.millward on Fri, 03 January 2014 12:53
		Re: closed contour paths: clockwise or anticlockwise - or actually a mixture? By: David Fanning on Fri, 03 January 2014 13:01
		Re: closed contour paths: clockwise or anticlockwise - or actually a mixture? By: George.millward on Fri, 03 January 2014 13:13

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