What do !area and !!area mean in a NET AREA RATIO expression?

Document created by chris_balcom on Nov 27, 2012
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!AREA(layername) returns a 1 if there is no data on 'layername'.

If there IS data on layername, a 0 is returned.

 

!!AREA(layername) returns a 0 if there is no data on 'layername'.

If there IS data on layername, a 1 is returned.

 

They are frequently used to "zero out" or conversely "multiply by 1"

(leave intact) the result of a larger more complicated expression in a NET AREA RATIO operation based on the existence (or absence) of data on a layer of interest.

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