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Related Experiment Videos

Reflectance-based calibration of SeaWiFS. I. Calibration coefficients.

Robert A Barnes1, Edward F Zalewski

  • 1Science Applications International Corporation, Beltsville, Maryland 20705, USA. rbarnes@seawifs.gsfc.nasa.gov

Applied Optics
|April 1, 2003
PubMed
Summary

This study introduces a new calibration method for the Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) using its onboard diffuser. This approach calibrates SeaWiFS by comparing Earth radiance measurements to diffuser reflectance, ensuring accurate ocean color data.

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Area of Science:

  • Earth Observation
  • Oceanography
  • Remote Sensing Instrumentation

Background:

  • Accurate calibration of satellite sensors is crucial for reliable ocean color data.
  • The Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) requires precise radiometric calibration for its scientific applications.
  • Previous calibration methods may have limitations in accuracy or applicability.

Purpose of the Study:

  • To develop and present a novel calibration approach for the SeaWiFS instrument.
  • To utilize the instrument's onboard diffuser for radiometric calibration.
  • To establish a robust method for ensuring the long-term accuracy of SeaWiFS data.

Main Methods:

  • The SeaWiFS sensor was used as a reflectometer to measure reflected solar irradiance.

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  • A ratioing technique was employed, comparing Earth radiance measurements to onboard diffuser reflectance.
  • The calibration relies on the reflectance characterization of the onboard diffuser and instrument linearity.

    • Main Results:

    • The proposed method bypasses the need for knowing solar irradiance values.
    • Absolute calibration coefficients for individual measurements are not required.
    • The technique leverages the common solar light source for both Earth and diffuser measurements.

    Conclusions:

    • This diffuser-based calibration approach offers a self-consistent method for SeaWiFS.
    • The technique is less dependent on external factors like solar irradiance knowledge.
    • It provides a reliable means to maintain the radiometric integrity of SeaWiFS data over time.