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An approximate atmospheric model accounting for Rayleigh- and aerosol multiple scattering and Rayleigh-aerosol coupling, is proposed for the atmospheric correction of SeaWiFS data. The accuracy of predicting water-leaving radiance is shown is shown to improve by the use of vicarious calibration factors trimming the absolute radiometric calibration inaccuracy of the space-borne sensor and the model inaccuracy. Making use of data from the three field campaigns carried out in 1998 at a calibration/validation site in the North Adriatic Sea, adjustment factors in the range of +/- 3% for the SeaWiFS channels between 412 and 765 nm have been computed for the pre-launch sensor calibration constants. The utilisation of these adjustment factors in the atmospheric correction process is discussed making use of 12 match-ups exhibiting almost coincident in situ and remote sensing data of the study area. Results show differences generally smaller than 10% in the 490 over 555 nm ratio of satellite derived and in situ normalized water-leaving radiances.

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Authors: STURM B, European Commission, Joint Research Centre, Space Applications Institute, Ispra (IT);ZIBORDI G, European Commission, Joint Research Centre, Space Applications Institute, Ispra (IT)
Bibliographic Reference: An article published in: International Journal of Remote Sensing, 23 (3) (2002), pp. 489-501
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