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Re: Correlation between bands using IDL [message #72054 is a reply to message #72037]

Tue, 03 August 2010 05:34

d.poreh
Messages: 406
Registered: October 2007

Senior Member

On Aug 3, 2:30 am, Lavanya <lavany...@gmail.com> wrote:
> Hi,
>
> I am pretty much new in using IDL. I have been trying to read
> multiband image data using envi_select and envi_file_query, where i
> get the information about the data im using.
> Now how could i find the correlation between any two bands (here the
> number of bands i have is 242)
> Finally i need to generate a output correlation matrix of 242 * 242.
> Please help me how can i go about.
>
> Thanks

It does not make sense to find correlation matrix of 242 * 242. I
think what you need is using the Principal component analysis (PCA).
With this you
could find the maximum variance which presents the maximum variation.
And you can decrease your number of bands to few factors. David has a
very good article about that: http://www.dfanning.com/code_tips/pca.html
Cheers
Dave

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[Message index]

		Re: Correlation between bands using IDL By: Lavanya on Wed, 04 August 2010 22:10
		Re: Correlation between bands using IDL By: rogass on Tue, 03 August 2010 23:49
		Re: Correlation between bands using IDL By: d.poreh on Tue, 03 August 2010 05:34
		Re: Correlation between bands using IDL By: rogass on Thu, 05 August 2010 00:25

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