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Re: Get Lat/long equivalent based on NEASE grid value [message #72968 is a reply to message #72967]

Thu, 21 October 2010 11:50

Snow53
Messages: 32
Registered: July 2010

Member

On Oct 21, 12:39 pm, David Fanning <n...@dfanning.com> wrote:
> Snow53 writes:
>> I have a file whose coordinate is in WGS-84 NEASE grid. I would like
>> to determine the lat/long value for each input pixel location. I
>> don't want to actually re-project the file, I just want that value. I
>> have included NEASE in the ENVI map_proj.txt file.
>
>> Any suggestions as to what might be the best way to do this?
>
> What in the world is a NEASE grid? :-)
>
> 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.")

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....

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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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