The Optimal Cloud Analysis is an algorithm to extract the principal cloud parameters (phase, pressure, optical thickness and effective radius) using an optimal estimation method and simultaneously all the SEVIRI spectral measurements. This combination allows for robust quality control (checking the scene corresponds to the cloud model) and systematic parameter error analysis. As part of the quality control, multi-layer clouds are identified and reprocessed with an adjusted model setup that permits the retrieval of two layer quantities. In the current configuration, the IR 3.9 Âµm and IR 9.6 Âµm measurements are made passive because of difficulties in the radiative transfer modelling.
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