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SeaWiFS transfer-to-orbit experiment.

R A Barnes1, R E Eplee, S F Biggar

  • 1General Sciences Corporation, Beltsville, Maryland 20705, USA. rbarnes@calval.gsfc.nasa.gov

Applied Optics
|March 21, 2008
PubMed
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The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) showed no significant radiometric calibration changes from manufacture to orbit. This transfer-to-orbit experiment confirms instrument stability within a 3% uncertainty level.

Area of Science:

  • Earth observation
  • Radiometric calibration
  • Satellite instrumentation

Background:

  • Accurate radiometric calibration is crucial for satellite data quality.
  • Understanding pre-launch to on-orbit radiometric changes is essential for long-term monitoring.
  • The Sea-viewing Wide Field-of-view Sensor (SeaWiFS) is a key instrument for oceanographic studies.

Purpose of the Study:

  • To measure radiometric calibration changes in the SeaWiFS instrument.
  • To assess instrument stability from manufacture to the start of on-orbit operations.
  • To validate the radiometric performance of SeaWiFS before and after launch.

Main Methods:

  • Utilized solar measurements at the manufacturer's facility to predict on-orbit performance.
  • Employed an onboard diffuser plate for solar measurements.

Related Experiment Videos

  • Measured changes in the combined instrument-diffuser system.

    • Main Results:

    • On-orbit instrument outputs averaged 0.8% higher than predicted across eight SeaWiFS bands.
    • Band 3 showed the largest difference at 2.1% higher than predicted.
    • The overall experimental uncertainty was estimated at 3%.

    Conclusions:

    • The transfer-to-orbit experiment indicates no significant radiometric sensitivity changes in SeaWiFS bands.
    • Radiometric stability was confirmed at the 3% uncertainty level.
    • Results support the reliability of SeaWiFS data for scientific applications.