Radiometric Calibration of the Visible and Near-Infrared Bands of Seviri Using Rayleigh Scattering and Sun-Glint Over Oceans

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Radiometric calibration methods based on clear-sky over ocean natural targets have been applied to three visible and near-infrared bands of SEVIRI sensor on- board MSG1 (now Meteosat-8) satellite. Those methods have been initially developed for in-flight calibration of POLDER sensors [1] and they have been successfully applied to other sensors [2]. An absolute calibration method based on rayleigh scattering is first applied to the 0.6 µm band (VIS 0.6). That calibration is then exported to the 0.8 (VIS 0.8) and 1.6 µm (NIR 1.6) bands using a cross-band calibration method based on sun-glint reflection. According to error budget analysis the accuracy of the method is below 3 % for VIS 0.6 band and below 5 % for cross-calibrated bands. Application to 2005-2006 data shows excellent stability along time. Calibration correction factors for each of the three bands are proposed.

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