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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 7, Iss. 8 — Aug. 2, 2012

Comment on “Long Island Sound Coastal Observatory: assessment of above-water radiometric measurement uncertainties using collocated multi and hyperspectral systems”

Giuseppe Zibordi  »View Author Affiliations

Applied Optics, Vol. 51, Issue 17, pp. 3888-3892 (2012)

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Harmel et al. [Appl. Opt. 50, 5842 (2011)] presented an intercomparison of products from collocated above-water radiometric measurements performed with a Hyperspectral Surface Acquisition System (HyperSAS) and a multispectral Sea-viewing Wide Field of View Sensor Photometer Revision for Incident Surface Measurements (SeaPRISM). Radiometric products from HyperSAS data were determined with a processing code written by the authors, while products from SeaPRISM measurements were obtained with the standard processor of the Ocean Color component of the Aerosol Robotic Network (AERONET-OC). Despite the application of equivalent processing schemes, results exhibit spectrally averaged unbiased relative differences of +26% between HyperSAS and SeaPRISM exact normalized water leaving radiances, LWN. Harmel et al. concluded that the sun-glint correction scheme applied for SeaPRISM data reduction is a major reason for the observed differences. This comment rejects the former conclusion as being supported by a wrong interpretation of the AERONET-OC processing scheme, and a consequent failure in describing the spectral properties of the glint radiance determined from SeaPRISM data. Afterward, the differences between HyperSAS and SeaPRISM LWN reported by Harmel et al. are challenged with intercomparison results from collocated measurements periodically performed over almost a decade with an in-water multispectral system and SeaPRISM. Results for LWN from the in-water system show spectrally averaged unbiased relative differences of +1% with respect to SeaPRISM values.

© 2012 Optical Society of America

OCIS Codes
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(010.0280) Atmospheric and oceanic optics : Remote sensing and sensors

ToC Category:
Atmospheric and Oceanic Optics

Original Manuscript: November 29, 2011
Manuscript Accepted: March 4, 2012
Published: June 8, 2012

Virtual Issues
Vol. 7, Iss. 8 Virtual Journal for Biomedical Optics

Giuseppe Zibordi, "Comment on “Long Island Sound Coastal Observatory: assessment of above-water radiometric measurement uncertainties using collocated multi and hyperspectral systems”," Appl. Opt. 51, 3888-3892 (2012)

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  1. T. Harmel, A. Gilerson, S. Hlaing, A. Tonizzo, T. Legbandt, A. Weidemann, R. Arnone, and S. Ahmed, “Long Island Sound Coastal Observatory: assessment of above-water radiometric measurement uncertainties using collocated multi and hyperspectral systems,” Appl. Opt. 50, 5842–5860 (2011). [CrossRef]
  2. C. Mobley, “Estimation of the remote-sensing reflectance from above surface measurements,” Appl. Opt. 38, 7442–7455 (1999). [CrossRef]
  3. G. Zibordi, B. N. Holben, I. Slutsker, D. Giles, D. D’Alimonte, F. Mélin, J.-F. Berthon, D. Vandemark, H. Feng, G. Schuster, B. E. Fabbri, S. Kaitala, and J. Seppälä, “AERONET-OC: a network for the validation of Ocean Color primary radiometric products,” J. Atmos. Ocean. Technol. 26, 1634–1651 (2009). [CrossRef]
  4. G. Zibordi, S. B. Hooker, J.-F. Berthon, and D. D’Alimonte, “Autonomous above water radiance measurements from stable platforms,” J. Atmos. Ocean. Technol. 19, 808–819 (2002). [CrossRef]
  5. S. B. Hooker, G. Lazin, G. Zibordi, and S. McClean, “An evaluation of above- and in-water methods for determining water leaving radiances,” J. Atmos. Ocean. Technol. 19, 486–515 (2002). [CrossRef]
  6. G. Zibordi, F. Mélin, S. B. Hooker, D. D’Alimonte, and B. N. Holben, “An autonomous above-water system for the validation of ocean color radiance data,” IEEE Trans. Geosci. Remote Sens. 42, 401–415 (2004). [CrossRef]
  7. S. B. Hooker, G. Zibordi, J.-F. Berthon, and J. W. Brown, “Above-water radiometry in shallow coastal waters,” Appl. Opt. 43, 4254–4268 (2004). [CrossRef]
  8. K. J. Voss, S. McLean, M. Lewis, C. Johnson, S. Flora, M. Feinholz, M. Yarbrough, C. Trees, M. Twardowski, and D. Clark, “An example crossover experiment for testing new vicarious calibration techniques for satellite ocean color radiometry,” J. Atmos. Ocean. Technol. 27, 1747–1759 (2010). [CrossRef]
  9. G. Zibordi, K. Ruddick, I. Ansko, G. Moore, S. Kratzer, J. Icely, and A. Reinart, “In situ determination of the remote sensing reflectance: an intercomparison,” Ocean Sci. Discuss. 9, 787–833 (2012). [CrossRef]
  10. G. Zibordi, D. D’Alimonte, and J. F. Berthon, “An evaluation of depth resolution requirements for optical profiling in coastal waters,” J. Atmos. Ocean. Technol. 21, 1059–1073 (2004). [CrossRef]
  11. G. Zibordi and K. J. Voss, “Field radiometry and ocean color remote sensing,” in Oceanography from Space, Revisited., V. Barale, J. F. R. Gower, and L. Alberotanza, ed. (Springer, 2010), pp. 365–398.
  12. G. Thuillier, M. Hersé, D. Labs, T. Foujols, W. Peetermans, D. Gillotay, P. C. Simon, and H. Mandel, “The solar spectral irradiance from 200 to 2400 nm as measured by the SOLSPEC spectrometer from the Atlas and Eureca missions,” Sol. Phys. 214, 1–22 (2003). [CrossRef]
  13. G. Zibordi, J.-F. Berthon, F. Mélin, D. D’Alimonte, and S. Kaitala, “Validation of satellite ocean color primary products at optically complex coastal sites: Northern Adriatic Sea, Northern Baltic Proper and Gulf of Finland,” Remote Sens. Environ. 113, 2574–2591 (2009). [CrossRef]
  14. S. B. Hooker, S. McLean, J. Sherman, M. Small, G. Lazin, G. Zibordi, and J. W. Brown, “The seventh SeaWiFS intercalibration round-robin experiment (SIRREX-7), March 1999,” NASA Tech. Memo. 2002–206892, Vol. 17, S. B. Hooker and E. R. Firestone, eds. (NASA Goddard Space Flight Center, Greenbelt, Md., 2002).
  15. G. Zibordi and B. Bulgarelli, “Effects of cosine error in irradiance measurements from field ocean color radiometers,” Appl. Opt. 46, 5529–5538 (2007). [CrossRef]
  16. G. Zibordi, F. Mélin, and J.-F. Berthon, “Comparison of SeaWiFS, MODIS and MERIS radiometric products at a coastal site,” Geophys. Res. Lett. 33, L06617 (2006). [CrossRef]
  17. S. W. Bailey and P. J. Werdell, “A multi-sensor approach for the on-orbit validation of ocean color satellite data products,” Remote Sens. Environ. 102, 12–23 (2006). [CrossRef]

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