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Proceedings Paper

A general ocean color atmospheric correction scheme based on principal components analysis: Part I. Performance on Case 1 and Case 2 waters
Author(s): Lydwine Gross-Colzy; Stéphane Colzy; Robert Frouin; Patrice Henry
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Paper Abstract

In order to retrieve ocean color from satellite imagery, one must perform atmospheric correction, because when observed from space the ocean signature is weak compared with the strong atmospheric signal. The color of the ocean depends on its optically active constituents: water molecules, dissolved matter, and particulate matter. In the open ocean, the color is mainly due to water molecules and phytoplankton, whereas in the coastal zone, the color also results from the presence of sediments and colored dissolved organic matter. Because coastal waters (Case 2 waters) are much more difficult to decouple from the atmosphere than open ocean (Case 1 waters), operational atmospheric correction algorithms usually separate Case 1 from Case 2 waters processing. The solution proposed in this paper does not separate them. Our algorithm, referred to as Ocean Color Estimation by principal component ANalysis (OCEAN), exploits the fact that ocean is more variable spectrally than the atmosphere, while the atmosphere signal is more variable in magnitude. The satellite reflectance is first decomposed into principal components. The components sensitive to the ocean signal are then combined to retrieve the principal components of the marine reflectance via neural network methodology. The algorithm is described, and results are presented on real and simulated data for POLDER, MERIS, SeaWiFS, and MODIS. Accurate water reflectance estimates are obtained for various aerosol types and contents (including maritime, coastal and urban mixtures), and for the full range of water properties (resulting from realistic combinations of chlorophyll content, sediment content, and colored dissolved matter absorption).

Paper Details

Date Published: 11 October 2007
PDF: 12 pages
Proc. SPIE 6680, Coastal Ocean Remote Sensing, 668002 (11 October 2007); doi: 10.1117/12.738508
Show Author Affiliations
Lydwine Gross-Colzy, Capgemini Space Unit (France)
Stéphane Colzy, Magellium (France)
Robert Frouin, Scripps Institution of Oceanography (United States)
Patrice Henry, Ctr. National des Etudes Spatiales (France)

Published in SPIE Proceedings Vol. 6680:
Coastal Ocean Remote Sensing
Robert J. Frouin; ZhongPing Lee, Editor(s)

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