Now i’m using the data of Sentinel-2A, but I can’t find any information about the theory of Sentinel-2A atmospheric correction,IS it 6S radiative transfer model in theory of atmospheric correction? CAN anyone help me and tell me about it?
the different product levels are described in the Sentinel-2 manual, chapter 1.10:
You can find information about atmospheric correction in the manual of sen2cor, chapter 2.2, especially 2.2.2 onwards:
I am not sure it is what you are searching for, but I have written some basics things about atmospheric correction in my blog. You might want to check my “How it works page” : http://www.cesbio.ups-tlse.fr/multitemp/?page_id=1336