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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 9 — Mar. 20, 2003
  • pp: 1629–1647

Reflectance-based calibration of SeaWiFS. I. Calibration coefficients

Robert A. Barnes and Edward F. Zalewski  »View Author Affiliations


Applied Optics, Vol. 42, Issue 9, pp. 1629-1647 (2003)
http://dx.doi.org/10.1364/AO.42.001629


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Abstract

We present a calibration approach for the Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) based on the reflectance properties of the instrument’s onboard diffuser. This technique uses SeaWiFS as a reflectometer, measuring the reflected solar irradiance from the Earth and from the onboard diffuser. Because the Sun is the common source of light for both measurements, the ratio of the SeaWiFS-measured radiances from the Earth and the diffuser provide the ratio for the reflectances of the two samples. The reflectance characterization of the onboard diffuser is the calibration reference for this approach. Knowledge of the value of the solar irradiance is not required for these measurements because it falls out of the ratio. Knowledge of the absolute calibration coefficient for the SeaWiFS measurements of each of the two samples is not required either. Instead, the result of the ratioing technique is based on the linearity of the instrument’s response to the intensity of the input light. The calibration requires knowledge, however, of the reflectance of the onboard diffuser at the start of the SeaWiFS mission and the response of the instrument bands, in digital numbers, for measurements of the diffuser at that time.

© 2003 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(120.5700) Instrumentation, measurement, and metrology : Reflection

History
Original Manuscript: August 30, 2002
Revised Manuscript: December 23, 2002
Published: March 20, 2003

Citation
Robert A. Barnes and Edward F. Zalewski, "Reflectance-based calibration of SeaWiFS. I. Calibration coefficients," Appl. Opt. 42, 1629-1647 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-9-1629


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