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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 2 — Jan. 18, 2010
  • pp: 479–499

Stochastic inversion of ocean color data using the cross-entropy method

Mhd. Suhyb Salama and Fang Shen  »View Author Affiliations

Optics Express, Vol. 18, Issue 2, pp. 479-499 (2010)

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Improving the inversion of ocean color data is an ever continuing effort to increase the accuracy of derived inherent optical properties. In this paper we present a stochastic inversion algorithm to derive inherent optical properties from ocean color, ship and space borne data. The inversion algorithm is based on the cross-entropy method where sets of inherent optical properties are generated and converged to the optimal set using iterative process. The algorithm is validated against four data sets: simulated, noisy simulated in-situ measured and satellite match-up data sets. Statistical analysis of validation results is based on model-II regression using five goodness-of-fit indicators; only R2 and root mean square of error (RMSE) are mentioned hereafter. Accurate values of total absorption coefficient are derived with R2 > 0.91 and RMSE, of log transformed data, less than 0.55. Reliable values of the total backscattering coefficient are also obtained with R2 > 0.7 (after removing outliers) and RMSE < 0.37. The developed algorithm has the ability to derive reliable results from noisy data with R2 above 0.96 for the total absorption and above 0.84 for the backscattering coefficients.The algorithm is self contained and easy to implement and modify to derive the variability of chlorophyll-a absorption that may correspond to different phytoplankton species. It gives consistently accurate results and is therefore worth considering for ocean color global products.

© 2010 Optical Society of America

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(010.7340) Atmospheric and oceanic optics : Water
(100.3190) Image processing : Inverse problems

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: September 24, 2009
Revised Manuscript: November 27, 2009
Manuscript Accepted: November 27, 2009
Published: January 4, 2010

Mhd. Suhyb Salama and Fang Shen, "Stochastic inversion of ocean color data using the cross-entropy method," Opt. Express 18, 479-499 (2010)

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