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Re: GetValueAtLocation() method [message #84823 is a reply to message #84814]

Wed, 12 June 2013 06:19

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

markjamie@gmail.com writes:

> So, assuming it can't deal with negative axes and the problem is not me using the method incorrectly, what is the best way to extract the values along an arbitrary line across a surface (z) with defined x and y axes?

Well, I haven't ruled out you using the method incorrectly. I haven't
had time to actually fool with this yet. I'm just not surprised you are
running into a problem. :-)

> With a list of x and y values, can interpolate or interpol be used to provide the corresponding z values from the surface?

Assuming you can locate two points on the surface, I think some
variation of the interpolation algorithm in the following article could
be devised to come up with the values you are looking for.

http://www.idlcoyote.com/ip_tips/image_profile.html

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]

		GetValueAtLocation() method By: markjamie on Tue, 11 June 2013 15:13
		Re: GetValueAtLocation() method By: David Fanning on Tue, 11 June 2013 15:58
		Re: GetValueAtLocation() method By: markjamie on Tue, 11 June 2013 23:50
		Re: GetValueAtLocation() method By: David Fanning on Wed, 12 June 2013 06:19

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