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Updated: Mar 12, 2026

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Radiometric Measurement Comparison Using the Ocean Color Temperature Scanner (OCTS) Visible and Near Infrared

B Carol Johnson1, F Sakuma2, J J Butler3

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899-0001.

Journal of Research of the National Institute of Standards and Technology
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

Radiometric comparisons for ocean color satellite instruments, Ocean Color and Temperature Scanner (OCTS) and Sea-viewing Wide Field-of-view Sensor (SeaWiFS), showed agreement within measurement uncertainties, validating calibration methods.

Keywords:
EOSOCTSSeaWiFScalibrationintegrating spheremeasurement comparisonocean colorremote sensingspectral radiometrytransfer radiometers

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Area of Science:

  • Earth and Space Science
  • Optical Remote Sensing
  • Radiometric Calibration

Background:

  • Pre-flight calibration and validation are crucial for ocean color satellite instruments.
  • Accurate radiometric measurements are essential for understanding oceanographic phenomena and climate change.

Purpose of the Study:

  • To conduct a radiometric measurement comparison for the OCTS and SeaWiFS instruments.
  • To validate the calibration of the OCTS integrating sphere source.

Main Methods:

  • Utilized portable radiometers from NIST, NASA/GSFC, UA, and NRLM.
  • Measured spectral radiance of the OCTS integrating sphere at four radiance levels.
  • Compared measurements against the NEC calibration of the sphere.

Main Results:

  • Measurements showed agreement within -2.7% to 3.9% compared to the NEC calibration.
  • Overall agreement was within combined measurement uncertainties.
  • Inter-comparison of radiometers also yielded results within combined uncertainties.

Conclusions:

  • The results demonstrate the utility of laboratory calibration integrating sphere sources for radiometric comparisons.
  • These findings support the calibration and validation of ocean color satellite instruments.
  • Future comparisons will focus on instruments for NASA's Earth Observing System (EOS).