| Re: IDL 8.1 Map Projections [message #77817] |
Fri, 07 October 2011 06:36 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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nata writes:
> You should know that the max and min latitude on the Mercator
> projection is ±85.05113°. That's why you don't see anything on the
> poles....
> http://en.wikipedia.org/wiki/Mercator_projection
Yes, maybe so. But why cut things off at 75 degrees
then? There is a lot about these map projections that
seem really arbitrary (and undocumented) to me.
I don't understand, for example, why the aspect
ratios of the map projections in the graphics window
are what they are. I presume there *is* a reason,
but I just can't find it anywhere.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")
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