Sentinel-2 terrain correction

[ABraun]

@filipeadao

My question to you is: can I process L2A files with sen2cor for terrain correction using a higher resolution DEM or should I forget L2A files entirely and only work with L1C? I am worried that the double atmospheric correction that goes along with the terrain correction might affect the L2A data.

you can convert L1C to L2A products using sen2cor and use an external DEM by modifying the parameters file L2A_GIPP.xml. It is described in the sen2cor manual and it was discussed in this thread: Sen2cor DEM usage