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Re: Get Lat/long equivalent based on NEASE grid value [message #72967 is a reply to message #72966]

Thu, 21 October 2010 12:04

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....

OK, but the NSIDC EASE grid projections use a
spherical datum, not a WGS-84 datum. Are you
performing some kind of datum transformation before
you look for the lat/lon values?

It's relatively easy. You could get the EASE grid
lat/lon values, for example, from the NSIDC web page. :-)

And if I knew exactly what you are trying to do, I could
probably provide some code to do it. It would be quite
easy to do. But I am afraid of what you are going to do
with these Lambert Azimuthal, WGS-84 lat/lon values and
NSIDC EASE gridded data. :-)

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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