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Related Experiment Videos

Radiometric validation of NASA's Ames Research Center's Sensor Calibration Laboratory.

Steven W Brown1, B Carol Johnson, Stuart F Biggar

  • 1National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.

Applied Optics
|October 29, 2005
PubMed
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NASA

Area of Science:

  • Earth Science
  • Radiometric Calibration
  • Remote Sensing

Background:

  • NASA's Ames Research Center's Airborne Sensor Facility (ASF) calibrates airborne Earth-viewing sensors for NASA Earth Observing System (EOS) studies.
  • A lamp-illuminated integrating sphere source is crucial for calibrating sensors in the 400-2500 nm reflective solar region.

Purpose of the Study:

  • Validate the radiometric scale and uncertainties of the Ames ASF integrating sphere source.
  • Assess the day-to-day repeatability of the sphere source.
  • Ensure radiometric calibration accuracy for long-term, global remote-sensing studies.

Main Methods:

  • Conducted a measurement comparison at the Ames ASF Sensor Calibration Facility in September 1999.
  • Evaluated Ames Sensor Calibration Laboratory (SCL) measurement procedures and radiometric uncertainties.

Related Experiment Videos

  • Performed long-term, multiyear radiance validation measurements of the sphere source.

    • Main Results:

    • The September 1999 comparison validated the radiometric scale and assigned uncertainties of the Ames SCL.
    • Long-term measurements independently assessed radiance values assigned to integrating sphere sources.
    • The SCF radiometric scale and uncertainties were validated from September 1999 through July 2003.

    Conclusions:

    • The Ames ASF's radiometric scale and uncertainty assignments were validated.
    • Independent, long-term measurements confirmed the stability and accuracy of the integrating sphere source.
    • The calibration procedures ensure the reliability of data from NASA's Earth-viewing sensors.