| Weird Map Projection [message #49900] |
Wed, 30 August 2006 11:37  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Folks,
OK, here is a question from the mail bag that I don't know
the answer to.
How can I set up a map projection space, using MAP_SET
if possible, that has longitude 360 on the LEFT and
longitude 0 of the RIGHT.
Here is a picture from a Cassini radar map that illustrates
more or less what I am going for.
http://tinyurl.com/j24nr
I want to overlay radar data onto something set up like
that. Is this done with MAP_SET, or is it done just by
setting up a data coordinate space that *looks* like a map?
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui.
(Opata Indian saying, meaning "Perhaps thou speakest truth.")
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| Re: Weird Map Projection [message #50090 is a reply to message #49900] |
Thu, 31 August 2006 03:43  |
greg michael
Messages: 163
Registered: January 2006
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Senior Member |
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It's not so weird - Mars conventionally has backwards coordinates, too.
I don't think many people are storing their surface data arrays
backwards, though - at least, I haven't come across it. So either just
fix the labels, or use east longitude instead.
Greg
David Fanning wrote:
> Folks,
>
> OK, here is a question from the mail bag that I don't know
> the answer to.
>
> How can I set up a map projection space, using MAP_SET
> if possible, that has longitude 360 on the LEFT and
> longitude 0 of the RIGHT.
>
> Here is a picture from a Cassini radar map that illustrates
> more or less what I am going for.
>
> http://tinyurl.com/j24nr
>
> I want to overlay radar data onto something set up like
> that. Is this done with MAP_SET, or is it done just by
> setting up a data coordinate space that *looks* like a map?
>
> Cheers,
>
> David
>
> --
> David Fanning, Ph.D.
> Fanning Software Consulting, Inc.
> Coyote's Guide to IDL Programming: http://www.dfanning.com/
> Sepore ma de ni thui.
> (Opata Indian saying, meaning "Perhaps thou speakest truth.")
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