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Question on ENVI 3.6 [message #34612]

Fri, 28 March 2003 05:45

Mort Canty
Messages: 134
Registered: March 2003

Senior Member

Hi

The maximum likelihood classifier in ENVI version 3.5 generated a Rule File
with class membership probabilities. Version 3.6 generates something else.
According to the on-line help:

"The rule images, one per class, contain a maximum likelihood discriminant
function with a modified Chi Squared probability distribution"

This is not very informative and also contradicts the help elsewhere, where
it says:

"Use rule images to create intermediate classification image results before
final assignment of classes. For example, rule images for the maximum
likelihood classification will be the probability images themselves; one for
each input ROI used in the classification. The rule image that has the
highest probability for a pixel is the class to which that pixel is
assigned. The probability values themselves are only retained in the rule
images, not in the classified image. "

Can anyone tell me what the numbers in the Rule File actually are and how to
convert them back to probabilities?

Many thanks

Mort Canty

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		Question on ENVI 3.6 By: Mort Canty on Fri, 28 March 2003 05:45
		Re: Question on ENVI 3.6 By: cshen on Sun, 13 April 2003 00:52

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