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MODIS In-flight Calibration MethodologiesMODIS is a key instrument for the NASA's Earth Observing System (EOS) currently operating on the Terra spacecraft launched in December 1999 and Aqua spacecraft launched in May 2002. It is a cross-track scanning radiometer, making measurements over a wide field of view in 36 spectral bands with wavelengths from 0.41 to 14.5 micrometers and providing calibrated data products for science and research communities in their studies of the Earth s system of land, oceans, and atmosphere. A complete suite of on-board calibrators (OBC) have been designed for the instruments in-flight calibration and characterization, including a solar diffuser (SD) and solar diffuser stability monitor (SDSM) system for the radiometric calibration of the 20 reflective solar bands (RSB), a blackbody (BB) for the radiometric calibration of the 16 thermal emissive bands (TEB), and a spectro-radiometric calibration assembly (SRCA) for the spatial (all bands) and spectral (RSB only) characterization. This paper discusses MODIS in-flight Cali bration methodologies of using its on-board calibrators. Challenging issues and examples of tracking and correcting instrument on-orbit response changes are presented, including SD degradation (20% at 412nm, 12% at 466nm, and 7% at 530nm over four and a half years) and response versus scan angle changes (10%, 4%, and 1% differences between beginning of the scan and end of the scan at 412nm, 466nm, and 530nm) in the VIS spectral region. Current instrument performance and lessons learned are also provided.
Document ID
20040171173
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Xiong, X.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Barnes, W.
(Maryland Univ. Baltimore County Catonsville, MD, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Earth Resources And Remote Sensing
Meeting Information
Meeting: CEOS-IVOS Workshop on the lntercornparison of Large Scale Optical Sensors
Location: Noordwijk
Country: Netherlands
Start Date: October 12, 2004
End Date: October 14, 2004
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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