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Calibration of SeaWiFS. I. Direct techniques.

R A Barnes1, R E Eplee, G M Schmidt

  • 1Science Applications International Corporation, Beltsville, Maryland 20705, USA.

Applied Optics
|March 28, 2008
PubMed
Summary
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The Sea-viewing Wide Field-of View Sensor (SeaWiFS) calibration ensures accurate ocean color data. Routine lunar measurements and vicarious calibration contribute to a 4-5% uncertainty in radiance measurements.

Area of Science:

  • Earth and Environmental Sciences
  • Remote Sensing
  • Oceanography

Background:

  • Accurate radiometric calibration is crucial for satellite-based ocean color measurements.
  • The Sea-viewing Wide Field-of View Sensor (SeaWiFS) has completed three years of on-orbit operations.

Purpose of the Study:

  • To provide a comprehensive overview of the SeaWiFS calibration process.
  • To detail the methods used for radiometric calibration from prelaunch to on-orbit.
  • To assess the overall uncertainty in SeaWiFS radiance measurements.

Main Methods:

  • Prelaunch radiometric calibration traceable to the National Institute of Standards and Technology.
  • Transfer-to-Orbit Experiment to assess pre-launch to on-orbit calibration changes.
  • Routine solar and lunar measurements for on-orbit radiometric sensitivity monitoring.

Related Experiment Videos

  • Vicarious calibration using Marine Optical Buoy surface truth data for visible bands.

    • Main Results:

    • Overall uncertainty in SeaWiFS top-of-the-atmosphere radiances is estimated at 4-5%.
    • Comparison campaigns with aircraft and ground-based measurements validate SeaWiFS band calibration.
    • Routine lunar measurements are uniquely employed for radiometric sensitivity changes.

    Conclusions:

    • The SeaWiFS calibration strategy, incorporating lunar measurements, provides reliable data.
    • Vicarious calibration refines ocean color data accuracy.
    • Ongoing calibration efforts ensure the long-term quality of SeaWiFS data.