In-orbit calibration of SeaWiFS in the near infrared

Nadege Martiny; Robert J. Frouin; Richard P. Santer

doi:10.1117/12.511446

2 February 2004 In-orbit calibration of SeaWiFS in the near infrared

Nadege Martiny, Robert J. Frouin, Richard P. Santer

Proceedings Volume 5234, Sensors, Systems, and Next-Generation Satellites VII; (2004) https://doi.org/10.1117/12.511446
Event: Remote Sensing, 2003, Barcelona, Spain

Abstract

The SeaWiFS sensor is required to provide spectral water leaving radiances with 5% absolute accuracies in the open ocean. This is extremely demanding because first the signal coming from the water body represents only 10% of the measured signal and second, calibration procedure of bands 7 and 8 is not direct like the vicarious calibration applied to bands 1 through 6. As a change of 5% in the sensitivity of these bands can imply errors of 10 to 50% on the water leaving radiance, it is suggested to revisit more accurately the SeaWiFS calibration in the near infrared. In this paper, we propose to apply a calibration method based on the use of CIMEL ground-based measurements. The radiance-based method, fully described in Santer and Martiny (2003), aims at the inversion of the atmospheric phase function from diffusion measurements in the principal plane with an accuracy of less than 1% using an iterative mode. Phase function, optical thickness and wind speed are the inputs of a radiative-transfer-code for computations of SeaWiFS top-of-atmosphere radiances. The method is quite sensitive to the CIMEL radiance calibration and to assumptions regarding the sea surface roughness. Nevertheless, its accuracy is of 2-3% depending on SeaWiFS geometry. Applications were conducted on Venice (Italy) and Lanai (Hawaii) datasets. The results depict an overestimate of the SeaWiFS calibration of 6.3% at 865 nm and 3% at 765 nm.

Citation Download Citation

Nadege Martiny, Robert J. Frouin, and Richard P. Santer "In-orbit calibration of SeaWiFS in the near infrared", Proc. SPIE 5234, Sensors, Systems, and Next-Generation Satellites VII, (2 February 2004); https://doi.org/10.1117/12.511446

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