BOA/Water-leaving radiances

Sorry, I thought reflectance values would be equally good for you.
In this case I have no better idea.
The Reflectance to Radiance can be used but I’m not sure about the accuracy.
I think you can use U=1, for the incidence angle you can use an average from the SZA tie-points of the L1 product and for solar flux the same. You can use and average value based on the solar_flux.
This will give you results, but I have doubts regarding the quality.

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