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Remote Sens. 2017, 9(5), 412; doi:10.3390/rs9050412

EO-1 Data Quality and Sensor Stability with Changing Orbital Precession at the End of a 16 Year Mission

NASA’s Goddard Space Flight Center, Code 618, Greenbelt, MD 20771, USA
Stinger Ghaffarian Technologies (SGT), Greenbelt, MD 20770, USA
Joint Center for Earth Technology, University of Maryland, Baltimore County, Baltimore, MD 21250, USA
Department of Geography, University of Maryland, College Park, MD 20740, USA
Universities Space Research Association, Baltimore County, Columbia, MD 21044, USA
Author to whom correspondence should be addressed.
Academic Editors: Richard Müller and Prasad S. Thenkabail
Received: 30 January 2017 / Revised: 6 April 2017 / Accepted: 19 April 2017 / Published: 27 April 2017
View Full-Text   |   Download PDF [5740 KB, uploaded 27 April 2017]   |  


The Earth Observing One (EO-1) satellite has completed 16 years of Earth observations in early 2017. What started as a technology mission to test various new advancements turned into a science and application mission that extended many years beyond the satellite’s planned life expectancy. EO-1’s primary instruments are spectral imagers: Hyperion, the only civilian full spectrum spectrometer (430–2400 nm) in orbit, and the Advanced Land Imager (ALI), the prototype for Landsat-8’s pushbroom imaging technology. Both Hyperion and ALI instruments have continued to perform well, but in February 2011, the satellite ran out of the fuel necessary to maintain orbit, which initiated a change in precession rate that led to increasingly earlier equatorial crossing times during its last five years. The change from EO-1’s original orbit, when it was formation flying with Landsat-7 at a 10:01 a.m. equatorial overpass time, to earlier overpass times results in image acquisitions with increasing solar zenith angles (SZAs). This study takes several approaches to characterize data quality as SZAs increased. The results show that for both EO-1 sensors, atmospherically corrected reflectance products, are within 5 to 10% of mean pre-drift products. No marked trend in decreasing quality in ALI or Hyperion is apparent through 2016, and these data remain a high quality resource through the end of the mission. View Full-Text
Keywords: EO-1; Hyperion; Advanced Land Imager (ALI); precession; solar zenith angle; data quality; Landsat-7 EO-1; Hyperion; Advanced Land Imager (ALI); precession; solar zenith angle; data quality; Landsat-7

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Franks, S.; Neigh, C.S.R.; Campbell, P.K.; Sun, G.; Yao, T.; Zhang, Q.; Huemmrich, K.F.; Middleton, E.M.; Ungar, S.G.; Frye, S.W. EO-1 Data Quality and Sensor Stability with Changing Orbital Precession at the End of a 16 Year Mission. Remote Sens. 2017, 9, 412.

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