| Re: AVHRR Image Mapping Problem [message #51981 is a reply to message #51852] |
Fri, 15 December 2006 17:45   |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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David Fanning writes:
> Whoa!! About the third number I switched suddenly solved
> the problem! Uh, how do I justify THIS!? Talk about an
> empirical programming style...
Just for completeness, here is my *final* solution. (That
is, I'm not fooling with it anymore!)
Here are the changes I made:
1. Changed standard parallels from -19 and 21 to
-19.9999 and 20.0001. (Don't know if this is
needed or not.)
2. Changed the locations of the center of the corner
pixels like this (found empirically):
; YX coordinates of the four corners (LL, UL, UR, LR)
; longitude = [-23.49, -24.6, 64.523, 63.414]
longitude = [-22.49, -24.6, 64.523, 61.414]
; latitude = [-42.243, 43.711, 43.712, -42.242]
latitude = [-42.743, 43.711, 43.712, -40.500]
Here is how the final map projection looks now:
http://www.dfanning.com/misc/final.png
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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