Dear all,
I have two questions about reflectance to radiance conversion and physical gains in L1C products metadata.
first of all, for some images (recently acquired) there are only 12 values for physical gains instead of 13 and I haven’t found yet any explanation about their meaning. Are they useful in some way for reflectance to radiance conversion? Which bands do they refer to?
A second question concerning the expression for conversion:
in this topic Distance of Earth-Sun roTOA is both multiplied and divided by U factor in 2 different posts and in this own topic is multiplied.
Which is the correct expression?
L = (UrToaESUNcos(theta))/PI
or
L = (rToaESUNcos(theta))/(PIU)
thanks a lot
ilaria