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Re: Plot curved line on a globe projection [message #85350 is a reply to message #85349]

Sun, 28 July 2013 13:36

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

ljs15@fsmail.net writes:

> 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?

In general, the way this would be done is to work in projected meter
space, not lat/lon space. Then, the equation of a circle is trivial. If
you *have* to plot in lat/lon you can inverse transform your circle
points from projected meter space to lat/lon space.

The cgMap object always works in projected meter space. :-)

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]

		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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