The TROPOMI/S5P cloud properties retrieval is based on the OCRA and ROCINN algorithms currently being used in the operational GOME and GOME-2 products. OCRA retrieves the cloud fraction using measurements in the UV/VIS spectral regions and ROCINN retrieves the cloud height (pressure) and optical thickness (albedo) using measurements in and around the oxygen A-band at 760 nm. For TROPOMI/S5P we use OCRA/ROCINN Version 3.0, which is based on a more realistic treatment of clouds as optically uniform layers of light-scattering particles. 

Data product version summary (click current version number for latest ATBD).
Version number Version Effective Date Summary of Changes
1.0.0 6 months post-launch to next update Post-Phase E1 updates
0.11.04 present to 6 months post-launch First product release



The Algorithm Theoretical Basis Document (ATBD) can be found by clicking here and the Product User Manual (PUM) link is located on the right under Documentation. Sample data can be downloaded at the bottom of this page. 

After launch, preliminary product results will be provided during the Commissioning Phase E1 and the Operational Phase. Product README (PRF) files will be created during Phase E1 in preparation for the Operational Phase.