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Re: Get min and max values from a multiband image according to pixel locations of classification image [message #82056 is a reply to message #82055]

Sat, 17 November 2012 07:40

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Dry in water writes:

>
> Hello all,
>
> I have a question to solve following issue.
> I have two images. One is a multiband image with 7bands. Another is an classifiction image with 3 classes. The classes named by class1 to class3. I'd like to obtain a single max/min values from a multiband image according to pixel locations of each classes (class1, class2, class3) of classification image. Could you help me for this?
>
> Thank you very much

Get the MIN and MAX values of the band interleaved image:

minImage = Min(image, DIMENSION=3, Max=MaxImage)

Locate class pixels:

class1Pixels = Where(classifiedImage EQ class1, count)
IF count GT 0 THEN BEGIN
class1Min = minImage[class1Pixels]
class1Max = maxImage[class1Pixels]
ENDIF

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thue. ("Perhaps thou speakest truth.")

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		Re: Get min and max values from a multiband image according to pixel locations of classification image By: David Fanning on Sat, 17 November 2012 07:53
		Re: Get min and max values from a multiband image according to pixel locations of classification image By: David Fanning on Sat, 17 November 2012 07:40

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