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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 21 — Jul. 20, 1999
  • pp: 4649–4664

Changes in the radiometric sensitivity of SeaWiFS determined from lunar and solar-based measurements

Robert A. Barnes, Robert E. Eplee, Jr., Frederick S. Patt, and Charles R. McClain  »View Author Affiliations


Applied Optics, Vol. 38, Issue 21, pp. 4649-4664 (1999)
http://dx.doi.org/10.1364/AO.38.004649


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Abstract

We report on the lunar and solar measurements used to determine the changes in the radiometric sensitivity of the Sea-viewing Wide Field-of-view Sensor (SeaWiFS). Radiometric sensitivity is defined as the output from the instrument (or from one of the instrument bands) per unit spectral radiance at the instrument’s input aperture. Knowledge of the long-term repeatability of the SeaWiFS measurements is crucial to maintaining the quality of the ocean scenes derived from measurements by the instrument. For SeaWiFS bands 1–6 (412–670 nm), the change in radiometric sensitivity is less than 0.2% for the period from November 1997 through November 1998. For band 7 (765 nm), the change is approximately 1.5% and for band 8 (865 nm) approximately 5%. The rates of change of bands 7 and 8, which were linear with time for the first eight months of lunar measurements, are now slowing. The scatter in the data points about the trend lines in this analysis is less than 0.3% for all eight SeaWiFS bands. These results are based on monthly measurements of the moon. Daily solar measurements using an onboard diffuser show that the radiometric sensitivities of the SeaWiFS bands have changed smoothly during the time intervals between lunar measurements. Because SeaWiFS measurements have continued past November 1998, the results presented here are considered as a snapshot of the instrument performance as of that date.

© 1999 Optical Society of America

OCIS Codes
(030.5630) Coherence and statistical optics : Radiometry
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(300.0300) Spectroscopy : Spectroscopy
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6550) Spectroscopy : Spectroscopy, visible

History
Original Manuscript: December 24, 1998
Revised Manuscript: April 12, 1999
Published: July 20, 1999

Citation
Robert A. Barnes, Robert E. Eplee, Frederick S. Patt, and Charles R. McClain, "Changes in the radiometric sensitivity of SeaWiFS determined from lunar and solar-based measurements," Appl. Opt. 38, 4649-4664 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-21-4649

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