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Re: Day/Night Terminator on Map Projection [message #48363 is a reply to message #48311]

Thu, 13 April 2006 08:20

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

David Fanning writes:

> 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.

Yikes! Matt Savoie just pointed out a very interesting
problem with the code on LINUX machines. It seems that
on LINUX (and possibly UNIX, I don't know) that issuing
a MAP_SET command changes the state of !P.MULTI. This
causes problems with TVIMAGE that I wasn't aware of.

Here is an IDL session on my LINUX box:

IDL> Print, !P.MULTI
0 0 0 0 0
IDL> Map_Set, /Cylindrical
IDL> Print, !P.MULTI
-1 0 0 0 0

An obvious workaround is to put a !P.MULTI=0 command
after every MAP_SET, but maybe there is something less
ugly than that available. I'll poke around a bit.

But in the meantime, I've put new code on my web page
that contains the workaround.

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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