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Landsat-7 ETM+ Radiometric Calibration Status.

Julia A Barsi1, Brian L Markham2, Jeffrey S Czapla-Myers3

  • 1SSAI, NASA/GSFC, Greenbelt MD USA 20771.

Proceedings of Spie--The International Society for Optical Engineering
|March 31, 2018
PubMed
Summary
This summary is machine-generated.

The Landsat-7 satellite's Enhanced Thematic Mapper+ (ETM+) shows stable radiometric performance. Calibration updates using Pseudo-Invariant Calibration Sites (PICS) and on-board devices confirm minimal degradation, ensuring data quality for the Earth observation archive.

Keywords:
ETM+Landsatcalibrationradiometryreflectivethermal

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Area of Science:

  • Earth Observation
  • Remote Sensing
  • Radiometric Calibration

Background:

  • The Landsat-7 satellite, launched in 1999, carries the Enhanced Thematic Mapper+ (ETM+) instrument, which has been operational for 17 years.
  • Continuous monitoring of the ETM+ on-orbit radiometric performance is crucial for maintaining the integrity of the long-term Landsat data archive.
  • Radiometric calibration of reflective bands relies on both on-board calibration devices and Pseudo-Invariant Calibration Sites (PICS).

Purpose of the Study:

  • To report on the on-orbit radiometric performance characterization of the Enhanced Thematic Mapper+ (ETM+) instrument on the Landsat-7 satellite.
  • To validate recent calibration updates and assess the long-term radiometric stability of the ETM+ sensor.
  • To evaluate the effectiveness of Pseudo-Invariant Calibration Sites (PICS) in monitoring sensor degradation.

Main Methods:

  • Radiometric calibration gains for reflective bands were updated in April 2013, primarily using Pseudo-Invariant Calibration Sites (PICS) data.
  • A comparison with the SADE database of PICS results was conducted to assess additional degradation post-update.
  • Thermal band calibration was updated in October 2013, incorporating efforts from NASA/Jet Propulsion Lab and Rochester Institute of Technology.

Main Results:

  • The April 2013 calibration update corrected for sensor degradation, with worst-case bands showing changes as high as -0.2% per year.
  • New comparisons with PICS data indicate no further degradation in the updated calibration, suggesting stability.
  • The thermal band calibration update addressed a bias error of 0.31 W/m² sr, resulting in a stable lifetime trend within +/- 0.4K.

Conclusions:

  • The Enhanced Thematic Mapper+ (ETM+) on Landsat-7 demonstrates stable radiometric performance following recent calibration updates.
  • Pseudo-Invariant Calibration Sites (PICS) remain an effective tool for monitoring sensor calibration, although recent trends require further investigation.
  • The updated calibration ensures the continued reliability of Landsat-7 data for long-term Earth observation applications.