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Re: Day/Night Terminator on Map Projection [message #48365 is a reply to message #48311]

Thu, 13 April 2006 05:10

Haje Korth
Messages: 651
Registered: May 1997

Senior Member

Thanks for sharing! Haje

"David Fanning" <davidf@dfanning.com> wrote in message
news:MPG.1ea796ded95b4343989c0c@news.frii.com...
> David Fanning writes:
>
>> Does anyone have IDL code for calculating the day/night
>> terminator on a map projection? Or perhaps an example of
>> a map in which you have done this?
>
> Thanks to Kelly Dean and Andrew Cool for suppling me
> with a few (slightly buggy!) examples of how to do this. :-)
>
> After spending most of the day scratching my head and
> pondering yet again the shear beauty of Ray Sterner's
> JHUAPL code, I finally came up with something I like.
>
> Rather than just drawing the day/night terminator, I wanted
> to see it in living color. So I used the AVHRR data set that
> comes in the IDL demo directory for this purpose. It makes
> a very pretty map, if I do say so myself!
>
> You can see the code I came up with and a nice picture
> here:
>
> http://www.dfanning.com/map_tips/terminator.html
>
> To run the code, you will need to have both the Coyote
> Library and the JHUAPL Library on your IDL path.
>
> I'll probably spend some time tomorrow making a little
> stand-alone application out of this with widgets so you
> can change the time interactively. It's more interesting
> than I would have thought to change the time and watch
> the sun and shadows move though the day and year. :-)
>
> Cheers,
>
> David
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming: http://www.dfanning.com/

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[Message index]

		Day/Night Terminator on Map Projection By: David Fanning on Fri, 07 April 2006 17:26
		Re: Day/Night Terminator on Map Projection By: JD Smith on Thu, 13 April 2006 16:15
		Re: Day/Night Terminator on Map Projection By: David Fanning on Thu, 13 April 2006 08:20
		Re: Day/Night Terminator on Map Projection By: Haje Korth on Thu, 13 April 2006 05:10
		Re: Day/Night Terminator on Map Projection By: David Fanning on Wed, 12 April 2006 23:00

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