Radiometric Intercomparison Between Copernicus Sentinel-2/MSI, Sentinel-3/OLCI and Sentinel-3/SLSTR Reflective Solar Bands Using DIMITRI Database

As part of the Copernicus program of the European Commission, the European Space Agency (ESA) developed and operated the Sentinel-2 constellation (S2A, S2B); and in cooperation with the EUMETSAT, they are operating the Sentinel-3 constellation (S3A, S3B). Both are Earth Observation optical missions, where the MultiSpectral Instruments (MSI) is carried on board Sentinel-2 mission and the Ocean and Land Colour Instrument (OLCI) and Sea Land Surface Temperature Radiometer (SLSTR) are on board Sentinel-3 mission. In the framework of the Copernicus Optical Mission Performance Cluster (OPT-MPC), we use the Database for Imaging Multispectral Instruments and Tools for Radiometric Inter-comparison (DIMITRI) to perform the radiometry intercomparison of the Level-1 products. The aims of this presentation are 1) to assess the quality of the data product; 2) to monitor the temporal evolution of the radiometry of the instruments MSI, OLCI and SLSTR for both unites A and B.The results of the intercomparison show a good stability of the sensors, although SLSTR-A & B show slight positive trend. MSI and SLST pairs A & B show good agreement better than 1% while OLCI constellation displays slight discrepancy up to 2-3%. While MSI-A, MSI-B, OLCI-B gain coefficients are within the missions’ requirements, OLCI-A, SLSTR-A and SLSTR-B ones are slightly higher of the mission requirements.