| Re: Principle Componets Analysis [message #55511 is a reply to message #55510] |
Thu, 23 August 2007 14:32   |
Jeff N.
Messages: 120
Registered: April 2005
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Senior Member |
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On Aug 23, 3:49 pm, David Fanning <da...@dfanning.com> wrote:
> 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/
Now that I think about it, I remember trying a while back going
through that tutorial and trying to get the same answer using
PCOMP....but never could. Has anyone else tried this? Did you get
good agreement?
Jeff
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