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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 34 — Dec. 1, 2008
  • pp: H182–H189

Retrieval of the optical depth using an all-sky CCD camera

Francisco J. Olmo, Alberto Cazorla, Lucas Alados-Arboledas, Miguel A. López-Álvarez, Javier Hernández-Andrés, and Javier Romero  »View Author Affiliations


Applied Optics, Vol. 47, Issue 34, pp. H182-H189 (2008)
http://dx.doi.org/10.1364/AO.47.00H182


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Abstract

A new method is presented for retrieval of the aerosol and cloud optical depth using a CCD camera equipped with a fish-eye lens (all-sky imager system). In a first step, the proposed method retrieves the spectral radiance from sky images acquired by the all-sky imager system using a linear pseudoinverse algorithm. Then, the aerosol or cloud optical depth at 500 nm is obtained as that which minimizes the residuals between the zenith spectral radiance retrieved from the sky images and that estimated by the radiative transfer code. The method is tested under extreme situations including the presence of nonspherical aerosol particles. The comparison of optical depths derived from the all-sky imager with those retrieved with a sunphotometer operated side by side shows differences similar to the nominal error claimed in the aerosol optical depth retrievals from sunphotometer networks.

© 2008 Optical Society of America

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(010.3920) Atmospheric and oceanic optics : Meteorology
(100.5010) Image processing : Pattern recognition
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(150.0150) Machine vision : Machine vision
(200.4260) Optics in computing : Neural networks

History
Original Manuscript: April 29, 2008
Revised Manuscript: October 7, 2008
Manuscript Accepted: October 17, 2008
Published: November 17, 2008

Citation
Francisco J. Olmo, Alberto Cazorla, Lucas Alados-Arboledas, Miguel A. López-Álvarez, Javier Hernández-Andrés, and Javier Romero, "Retrieval of the optical depth using an all-sky CCD camera," Appl. Opt. 47, H182-H189 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-34-H182

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