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Re: Plot curved line on a globe projection [message #85351 is a reply to message #85350]

Sun, 28 July 2013 13:45

Sir Loin Steak
Messages: 42
Registered: January 2012

Member

On Sunday, 28 July 2013 21:36:53 UTC+1, David Fanning wrote:
> ljs15@fsmail.net writes:
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>> On a similar topic, does anyone know of a method which would allow a circle to be plotted on a globe, from a specification of the central lat/lon location and the radius?
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> In general, the way this would be done is to work in projected meter
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> space, not lat/lon space. Then, the equation of a circle is trivial. If
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> you *have* to plot in lat/lon you can inverse transform your circle
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> points from projected meter space to lat/lon space.
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> The cgMap object always works in projected meter space. :-)
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> Cheers,
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> David
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> --
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> David Fanning, Ph.D.
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> Fanning Software Consulting, Inc.
>
> Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
>
> Sepore ma de ni thue. ("Perhaps thou speakest truth.")

Thanks again David. I'll give that a go.

I thought I'd struck gold with the ellipse function (http://www.exelisvis.com/docs/ELLIPSE.html), but it appears my idl package doesn't know what this is!

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[Message index]

		Plot curved line on a globe projection By: Sir Loin Steak on Sun, 28 July 2013 11:19
		Re: Plot curved line on a globe projection By: David Fanning on Sun, 28 July 2013 12:16
		Re: Plot curved line on a globe projection By: Sir Loin Steak on Sun, 28 July 2013 13:00
		Re: Plot curved line on a globe projection By: David Fanning on Sun, 28 July 2013 13:36
		Re: Plot curved line on a globe projection By: Sir Loin Steak on Sun, 28 July 2013 13:45

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