As part of my thesis I need to reference the way in which the images I used were atmospherically corrected, but since I worked using L2A products, I never needed to apply atmospheric correction myself.
I am aware that L1C products can be corrected using Sen2Cor, among other methods, but I can’t seem to find about how and when L2A products undergo atmospheric correction ? Does the Sentinel-2 system itself apply such a correction when creating the image ? Is it done as the image is saved in the database ? The atmospheric correction method used is the same as Sen2Cor’s ?
I have a similar doubt. I am analyzing some 2017-2018 images. If I take 1C and 2A images from same date and process the second one with sen2cor i have different values.
So, what is the treatment that use in scihub?