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Assessments and Applications of Terra and Aqua MODIS On-Orbit Electronic CalibrationMODIS has 36 spectral bands located on four focal plane assemblies (FPAs), covering wavelengths from 0.41 to 14.4 micrometers. MODIS bands 1-30 collect data using photovoltaic (PV) detectors and, therefore, are referred to as the PV bands. Similarly, bands 31-36 using photoconductive (PC) detectors are referred to as the PC bands.The MODIS instrument was built with a set of on-board calibrators (OBCs) in order to track on-orbit changes of its radiometric, spatial, and spectral characteristics. In addition, an electronic calibration (ECAL) function can be used to monitor on-orbit changes of its electronic responses (gains). This is accomplished via a series of stair step signals generated by the ECAL function. These signals, in place of the FPA detector signals, are amplified and digitized just like the detector signals. Over the entire mission of both Terra and Aqua MODIS,the ECAL has been performed for the PV bands and used to assess their on-orbit performance. This paper provides an overview of MODIS on-orbit calibration activities with a focus on the PV ECAL, including its calibration process and approaches used to monitor the electronic performance. It presents the results derived and lessons learned from Terra and Aqua MODIS on-orbit ECAL. Also discussed are some of the applications performed with the information provided by the ECAL data.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Xiong, Xiaoxiong
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Chen, Na
(Science Systems and Applications, Inc. Greenbelt, MD, United States)
Li, Yonghong
(Science Systems and Applications, Inc. Greenbelt, MD, United States)
Wilson, Truman
(Science Systems and Applications, Inc. Greenbelt, MD, United States)
Date Acquired
April 17, 2017
Publication Date
August 30, 2016
Publication Information
Publication: Proceedings of The International Society for Optical Engineering (SPIE)
Publisher: SPIE
Volume: 9972
ISSN: 0277-786X
e-ISSN: 1996-756X
Subject Category
Earth Resources And Remote Sensing
Report/Patent Number
Meeting Information
Meeting: Earth Observing Systems Conference
Location: San Diego, CA
Country: United States
Start Date: August 30, 2016
End Date: September 1, 2016
Sponsors: International Society for Optical Engineering
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