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Proc SPIE Int Soc Opt Eng. 2016;9972. pii: 99720C. doi: 10.1117/12.2238625. Epub 2016 Sep 19.

Landsat-7 ETM+ Radiometric Calibration Status.

Author information

1
SSAI, NASA/GSFC, Greenbelt MD USA 20771.
2
NASA/GSFC, Greenbelt MD 20771.
3
University of Arizona, Tucson AZ 85721 USA.
4
South Dakota State University, Brookings SD 57007 USA.
5
NASA/JPL, Pasadena CA 91109.
6
Rochester Institute of Technology, Rochester NY 14623.
7
SGT, USGS/EROS, Sioux Falls, SD 57198.

Abstract

Now in its 17th year of operation, the Enhanced Thematic Mapper + (ETM+), on board the Landsat-7 satellite, continues to systematically acquire imagery of the Earth to add to the 40+ year archive of Landsat data. Characterization of the ETM+ on-orbit radiometric performance has been on-going since its launch in 1999. The radiometric calibration of the reflective bands is still monitored using on-board calibration devices, though the Pseudo-Invariant Calibration Sites (PICS) method has proven to be an effect tool as well. The calibration gains were updated in April 2013 based primarily on PICS results, which corrected for a change of as much as -0.2%/year degradation in the worst case bands. A new comparison with the SADE database of PICS results indicates no additional degradation in the updated calibration. PICS data are still being tracked though the recent trends are not well understood. The thermal band calibration was updated last in October 2013 based on a continued calibration effort by NASA/Jet Propulsion Lab and Rochester Institute of Technology. The update accounted for a 0.31 W/m2 sr μm bias error. The updated lifetime trend is now stable to within +/- 0.4K.

KEYWORDS:

ETM+; Landsat; calibration; radiometry; reflective; thermal

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