Sen2Cor is a processor for Sentinel-2 Level 2A product generation and formatting; it performs the atmospheric-, terrain and cirrus correction of Top-Of- Atmosphere Level 1C input data. Sen2Cor creates Bottom-Of-Atmosphere, optionally terrain- and cirrus corrected reflectance images; additional, Aerosol Optical Thickness-, Water Vapor-, Scene Classification Maps and Quality Indicators for cloud and snow probabilities. Its output product format is equivalent to the Level 1C User Product: JPEG 2000 images, three different resolutions, 60, 20 and 10 m.

Sen2Cor installation packages are provided as standalone installers. For a short introduction of how to install the standalone version of Sen2Cor, read the installation steps described in section 4 of the release note S2-PDGS-MPC-L2A-SRN-V2.5.5.pdf

Sen2Cor v2.5.5 uses as auxiliary files, the surfaces of the Climate Change Initiative (CCI) Land Cover data from 2015. This auxiliary data information is used in Sen2Cor to improve the accuracy of Sen2Cor classification over water, urban and bare areas and also to have a better handling of false detection of snow pixels. More detailed information on the usage of ESA CCI data package for Sen2Cor v2.5.5 is available in the dedicated Software User Manual: S2-PDGS-MPC-L2A-SUM-V2.5.5_V2.pdf.

For any questions about the usage of Sen2Cor, please follow the general STEP forum area dedicated to Sen2Cor:

Latest release:

Detailed information on all changes implemented in the new format of Sentinel-2 L2A product is available in the dedicated documentation online: Sentinel-2 Products Specification Document (PSD)

Release Note: S2-PDGS-MPC-L2A-SRN-V2.5.5.pdf
Software User Manual: S2-PDGS-MPC-L2A-SUM-V2.5.5_V2.pdf
Sentinel-2 Level 2A Product Definition: S2-PDGS-MPC-L2A-PDD-V2.5.5.pdf
Sentinel-2 Level 2A Input Output Data Definition: S2-PDGS-MPC-L2A-IODD-V2.5.5.pdf

The schemas of the GIPP file, GIPP AC, SC, and PB files relative to Level-2A products are attached to the IODD document as a *.zipp attachment. The attachment should be saved, and renamed as .zip to enable it to be opened.