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. Additionally the cloud parameters are also provided for a cloud model which assumes the cloud to be a Lambertian reflecting boundary. The figures below illustrate the Cloud Fraction (top panel) and the Cloud Top Pressure (lower panel) as derived from TROPOMI data from 2 January 2018. 


Data product version summary (click on highlighted version number for the latest PRF).

Version number Version Effective Date Summary of Changes
1.01.02 NRTI: 2018-08-08 (orbit 04243 to present)
OFFL: 2018-08-01 (orbit 04147 to present)
Current version


NRTI: 2018-07-18 (orbits 03947 to 04242)
OFFL: 2018-07-11 (orbits 03848 to 04146)



NRTI: 2018-05-09 (orbits 02955 to 03946)




Links to the Algorithm Theoretical Basis Document (ATBD), Product User Manual (PUM), and the Product Readme File (PRF) is provided here on the right under Documentation. Note: this data product was publically released on 11 July 2018 and is available via the Copernicus Open Data Access Hub (see link on right).