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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 8 — Mar. 10, 2013
  • pp: 1605–1616

Day/night whole sky imagers for 24-h cloud and sky assessment: history and overview

Janet E. Shields, Monette E. Karr, Richard W. Johnson, and Art R. Burden  »View Author Affiliations


Applied Optics, Vol. 52, Issue 8, pp. 1605-1616 (2013)
http://dx.doi.org/10.1364/AO.52.001605


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Abstract

A family of fully automated digital whole sky imagers (WSIs) has been developed at the Marine Physical Laboratory over many years, for a variety of research and military applications. The most advanced of these, the day/night whole sky imagers (D/N WSIs), acquire digital imagery of the full sky down to the horizon under all conditions from full sunlight to starlight. Cloud algorithms process the imagery to automatically detect the locations of cloud for both day and night. The instruments can provide absolute radiance distribution over the full radiance range from starlight through daylight. The WSIs were fielded in 1984, followed by the D/N WSIs in 1992. These many years of experience and development have resulted in very capable instruments and algorithms that remain unique. This article discusses the history of the development of the D/N WSIs, system design, algorithms, and data products. The paper cites many reports with more detailed technical documentation. Further details of calibration, day and night algorithms, and cloud free line-of-sight results will be discussed in future articles.

© 2013 Optical Society of America

OCIS Codes
(010.0010) Atmospheric and oceanic optics : Atmospheric and oceanic optics
(010.1320) Atmospheric and oceanic optics : Atmospheric transmittance
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(290.1090) Scattering : Aerosol and cloud effects
(010.1615) Atmospheric and oceanic optics : Clouds
(110.4234) Imaging systems : Multispectral and hyperspectral imaging

ToC Category:
Atmospheric and Oceanic Optics

History
Original Manuscript: December 7, 2012
Manuscript Accepted: January 10, 2013
Published: March 6, 2013

Citation
Janet E. Shields, Monette E. Karr, Richard W. Johnson, and Art R. Burden, "Day/night whole sky imagers for 24-h cloud and sky assessment: history and overview," Appl. Opt. 52, 1605-1616 (2013)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-52-8-1605


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