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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 5 — Mar. 11, 2013
  • pp: 6257–6273

Impact of computational methods and spectral models on the retrieval of optical properties via spectral optimization

Shaohui Huang, Yonghong Li, Shaoping Shang, and Shaoling Shang  »View Author Affiliations


Optics Express, Vol. 21, Issue 5, pp. 6257-6273 (2013)
http://dx.doi.org/10.1364/OE.21.006257


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Abstract

Spectral optimization algorithm (SOA) is a well-accepted scheme for the retrieval of water constituents from the measurement of ocean color radiometry. It defines an error function between the input and output remote sensing reflectance spectrum, with the latter modeled with a few variables that represent the optically active properties, while the variables are solved numerically by minimizing the error function. In this paper, with data from numerical simulations and field measurements as input, we evaluate four computational methods for minimization (optimization) for their efficiency and accuracy on solutions, and illustrate impact of bio-optical models on the retrievals. The four optimization routines are the Levenberg-Marquardt (LM), the Generalized Reduced Gradient (GRG), the Downhill Simplex Method (Amoeba), and the Simulated Annealing-Downhill Simplex (i.e. SA + Amoeba, hereafter abbreviated as SAA). The Garver-Siegel-Maritorena SOA model is used as a base to test these computational methods. It is observed that 1) LM is the fastest method, but SAA has the largest number of valid retrievals; 2) the quality of final solutions are strongly influenced by the forms of spectral models (or eigen functions); and 3) dynamically-varying eigen functions are necessary to obtain smaller errors for both reflectance spectrum and retrievals. Results of this study provide helpful guidance for the selection of a computational method and spectral models if an SOA scheme is to be used to process ocean color images.

© 2013 OSA

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(010.0280) Atmospheric and oceanic optics : Remote sensing and sensors

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: February 8, 2013
Revised Manuscript: February 21, 2013
Manuscript Accepted: February 21, 2013
Published: March 5, 2013

Virtual Issues
Vol. 8, Iss. 4 Virtual Journal for Biomedical Optics

Citation
Shaohui Huang, Yonghong Li, Shaoping Shang, and Shaoling Shang, "Impact of computational methods and spectral models on the retrieval of optical properties via spectral optimization," Opt. Express 21, 6257-6273 (2013)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-21-5-6257


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