[ERDAS-L:6308] modeler conditional function

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modeler conditional function
By Bogdan in ERDAS Software Forum

Hello again,

I want to fill some Landsat 7 slc off images. To do that, I have one "master" image and several other images that I want to use to fill the gaps with.

So, for example, saying that my master image is "A" and the others are "B", "C", "D"...and so on...can I have a nested conditional statement like:

If A==0, then use B ,but if B==0 then use C, but if C==0 then use D...and so on?

 

Thanks a lot

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Re: modeler conditional function
By Larry Brantley in ERDAS Software Forum

Yes, the CONDITIONAL function does what you need:

CONDITIONAL { (A) A , (B) B , (C) C, (D) D } 

returns A if A is nonzero, B if A is zero but B is nonzero, C if both A & B are 0 but C is nonzero, and so on.

This will return zero if A, B, C & D are all zero. If you want to define a default value in case all the inputs are zero, for example 12, use

CONDITIONAL { (A) A , (B) B , (C) C, (D) D, (DEFAULT) 12} 

 

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