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This documentation, as well as the function properties window, call for Radiance Gain and Bias to produce what ArcMap is calling "Apparent Reflectance" -- a term I am not otherwise familiar with.

My admittedly sketchy understanding is that one can compute either radiance or reflectance from DN intensity values, using one set of parameters or the other. Can anyone clarify what is the output of "apparent reflectance"? Can one calculate surface or TOA reflectance using a raster function?

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    Please Edit the question to provide clarifications. It's not fair to those who would answer to need to mine the comments for question content. – Vince Oct 5 '18 at 3:16

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