| Re: Principle Componets Analysis [message #55516 is a reply to message #55515] |
Thu, 23 August 2007 12:49   |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Jeff N. writes:
> You can easily combine different images into a single cube in ENVI.
> Just go to File -> Save File As -> Envi Standard. Note that this
> "File" menu is in the main ENVI menu, not the file menu for a display
> window. You can do it for any number of bands, even different
> combinations of bands in different images, and once you combine them
> the PCA should work just fine.
Ah, fabulous. Piece of cake!
In case anyone is interested, here is a reference to a
FABULOUS explanation of priciple components analysis.
After reading it, I was convinced I could do PCA in IDL
if I couldn't get the darn ENVI stuff to work. But, in
the end, it was easier to let ENVI do the heavy lifting.
http://tinyurl.com/3aaeb6
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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