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Re: Map Projection Bug [message #64725 is a reply to message #64722]

Thu, 15 January 2009 14:25

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

cgpadwick@gmail.com writes:

> I see what you are getting at now. !MAP indeed does not change during
> the successive calls. I think your theory that there is an
> undocumented internal variable is sound. thanks for posting this,
> I'll keep this in mind when working with the map stuff.

In a discussion today among NSIDC programmers it was pointed
out that the reason we built some of our own map re-gridding
software was that the GCTP map projection software was
not re-entrant. That is to say, this problem is built
directly into the GCTP software and not necessarily something
ITTVIS has introduced. Of course, the GCTP software
is *extremely* old now, and anyone doing map projections
professionally is probably using some version of the proj4
software.

My personal belief is that the map projection software
in IDL has exceeded its shelf life. Useful map projections
(equal area cylindrical, for example) are missing, others
use only spherical projections, when most of the world
is using ellipsoid projections, etc.

I really hate to admit this, but more and more of IDL
is becoming irrelevant to me. It's always good for a quick
one-off, but there are better tools for doing particular
jobs, and I'm becoming increasingly motivated to learn them.

Cheers,

David
--
David Fanning, Ph.D.
Coyote's Guide to IDL Programming (www.dfanning.com)
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Map Projection Bug By: David Fanning on Thu, 15 January 2009 15:47
		Re: Map Projection Bug By: David Fanning on Thu, 15 January 2009 14:25
		Re: Map Projection Bug By: cgpadwick on Thu, 15 January 2009 13:21
		Re: Map Projection Bug By: pgrigis on Thu, 15 January 2009 12:43
		Re: Map Projection Bug By: MarioIncandenza on Thu, 15 January 2009 12:27
		Re: Map Projection Bug By: David Fanning on Thu, 15 January 2009 09:55
		Re: Map Projection Bug By: cgpadwick on Thu, 15 January 2009 09:01
		Re: Map Projection Bug By: R.Bauer on Fri, 16 January 2009 04:00

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