BOA/Water-leaving radiances

Optical Toolbox
#1

Hi,

is there a way of getting BOA radiances for OLCI? I know the reflectance-to-radiance processor exists but it seems to be designed for L1 Sentinel-2 data.
I’m having some trouble finding the right parameters (U, incidence angle) for the Sentinel-3 data I’m working with and am also worried that the processor might not be valid for atmospherically corrected data anyway.

Cheers and thanks for your help!

#2

For water you can have a look at the C2RCC processor.

#3

Thank you! In the description it says that C2RCC determines the “water leaving radiance”, but I can’t find any option to output radiance in SNAP, only water-leaving reflectance. It’s not the same thing right?

#4

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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