This document summarizes the main outcomes of the workshop on Radiative Transfer Modelling support to Earth Observation (EO) metrology and Cal/Val activities held the 7-9 June 2023 in Varese (IT). RAdiation transfer Model Intercomparison (RAMI) offers a long-term framework to benchmark models designed to simulate radiative transfer at or near the Earth's terrestrial surface as well as at the top-of-atmosphere.
This initiative has been instrumental in supporting rigorous Radiative Transfer Model (RTM) evaluation to support EO activities. With new-generation radiometers on board the Copernicus Sentinel platforms delivering data with unprecedented radiometric accuracy (often close to 2%), current retrieval methods and validation protocols should be carefully reviewed to make sure that they fully benefit from this improved accuracy of the delivered Level 1 Top of Atmosphere (ToA) data.