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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 3 — Apr. 4, 2013

Estimation of hyperspectral inherent optical properties from in-water radiometry: error analysis and application to in situ data

Eric Rehm and Curtis D. Mobley  »View Author Affiliations


Applied Optics, Vol. 52, Issue 4, pp. 795-817 (2013)
http://dx.doi.org/10.1364/AO.52.000795


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Abstract

An inverse algorithm is developed to retrieve hyperspectral absorption and backscattering coefficients from measurements of hyperspectral upwelling radiance and downwelling irradiance in vertically homogeneous waters. The forward model is the azimuthally averaged radiative transfer equation, efficiently solved by the EcoLight radiative transfer model, which includes the effects of inelastic scattering. Although this inversion problem is ill posed (the solution is ambiguous for retrieval of total scattering coefficients), unique and stable solutions can be found for absorption and backscattering coefficients. The inversion uses the attenuation coefficient at one wavelength to constrain the inversion, increasing the algorithm’s stability and accuracy. Two complementary methods, Monte Carlo simulation and first-order error propagation, are used to develop uncertainty estimates for the retrieved absorption and backscattering coefficients. The algorithm is tested using both simulated light fields from a chlorophyll-based case I bio-optical model and radiometric field data from the 2008 North Atlantic Bloom Experiment. The influence of uncertainty in the radiometric quantities and additional model parameters on the inverse solution for absorption and backscattering is studied using a Monte Carlo approach, and an uncertainty budget is developed for retrievals. All of the required radiometric and inherent optical property measurements can be made from power-limited autonomous platforms. We conclude that hyperspectral measurements of downwelling irradiance and upwelling radiance, with a single-wavelength measurement of attenuation, can be used to estimate hyperspectral absorption to an accuracy of ± 0.01 m 1 and hyperspectral backscattering to an accuracy of ± 0.0005 m 1 from 350 to 575 nm.

© 2013 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(030.5620) Coherence and statistical optics : Radiative transfer
(100.3190) Image processing : Inverse problems
(160.4760) Materials : Optical properties
(280.0280) Remote sensing and sensors : Remote sensing and sensors

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: September 25, 2012
Revised Manuscript: November 12, 2012
Manuscript Accepted: December 1, 2012
Published: February 1, 2013

Virtual Issues
Vol. 8, Iss. 3 Virtual Journal for Biomedical Optics

Citation
Eric Rehm and Curtis D. Mobley, "Estimation of hyperspectral inherent optical properties from in-water radiometry: error analysis and application to in situ data," Appl. Opt. 52, 795-817 (2013)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=ao-52-4-795

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Supplementary Material


» Media 1: MOV (594 KB)     
» Media 2: MOV (804 KB)     

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