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Re: Get Lat/long equivalent based on NEASE grid value [message #72961]

Thu, 21 October 2010 12:46

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Snow53 writes:

> It's the polar version of the NSIDC (http://nsidc.org/data/ease/)
> grid, based on the Lambert Azimuthal.
>
> So I've tried to use MAP_PROJ_INIT to define my projection and then
> feed it into MAP_PROJ_INVERSE to get my lat/long, but I haven't
> figured out how to point to the NEASE parameters via MAP_PROJ_INIT
> (AHHH!).
> I'm assuming that there must be some relatively easy way to do so....

By the way, I was going to write in one of my answers that
you can't use MAP_PROJ_INIT to create a Lambert Azimuthal
Equal Area (EASE grid) with a WGS-84 datum anyway, since
you can't use non-spherical axes to define your datum with
this projection. But, of course, I looked at the IDL on-line
help before I posted this, which is part of my strategy to
avoid looking the fool.

It said you could! That confused me, so I looked at the IDL
7 on-line help just now. That said you couldn't!

So, hooray! Something I really need is FIXED in IDL 8.0!!
I *knew* there was a reason I was spending all that money
to upgrade. ;-)

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. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Get Lat/long equivalent based on NEASE grid value By: David Fanning on Thu, 21 October 2010 12:46
		Re: Get Lat/long equivalent based on NEASE grid value By: Snow53 on Thu, 21 October 2010 12:33
		Re: Get Lat/long equivalent based on NEASE grid value By: David Fanning on Thu, 21 October 2010 12:28
		Re: Get Lat/long equivalent based on NEASE grid value By: Snow53 on Thu, 21 October 2010 12:18
		Re: Get Lat/long equivalent based on NEASE grid value By: David Fanning on Thu, 21 October 2010 12:04
		Re: Get Lat/long equivalent based on NEASE grid value By: Snow53 on Thu, 21 October 2010 11:50
		Re: Get Lat/long equivalent based on NEASE grid value By: David Fanning on Thu, 21 October 2010 11:39

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