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Vicarious calibration and inter-calibration techniques employ natural targets, such as warm deserts, the Moon, Deep Convective Clouds (DCC), and dark oceans, to transfer calibration from a radiometric reference to the monitored mission. These methods are indispensable for instruments like MSG/SEVIRI, lacking an on-board calibration device for solar channels, yet widely used for monitoring and validating the radiometric performance of on-board calibration systems. This paper presents the routine radiometric calibration monitoring of MTG-I1/FCI, MSG/SEVIRI and Sentinel-3 OLCI and SLSTR Level-1 products using our multi-mission tool, Mission Integrated Calibration Monitoring and Inter-Calibration System (MICMICS). The monitoring process encompasses diverse calibration targets, such as desert sites, DCC, lunar observations, and inter-comparisons with other reference instruments, enhancing the overall assessment. |
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