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Proceedings Paper

On-orbit operation and performance of MODIS blackbody
Author(s): X. Xiong; T. Chang; W. Barnes
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Paper Abstract

MODIS collects data in 36 spectral bands, including 20 reflective solar bands (RSB) and 16 thermal emissive bands (TEB). The TEB on-orbit calibration is performed on a scan-by-scan basis using a quadratic algorithm that relates the detector response with the calibration radiance from the sensor on-board blackbody (BB). The calibration radiance is accurately determined each scan from the BB temperature measured using a set of 12 thermistors. The BB thermistors were calibrated pre-launch with traceability to the NIST temperature standard. Unlike many heritage sensors, the MODIS BB can be operated at a constant temperature or with the temperature continuously varying between instrument ambient (about 270K) and 315K. In this paper, we provide an overview of both Terra and Aqua MODIS on-board BB operations, functions, and on-orbit performance. We also examine the impact of key calibration parameters, such as BB emissivity and temperature (stability and gradient) determined from its thermistors, on the TEB calibration and Level 1 (L1B) data product uncertainty.

Paper Details

Date Published: 21 August 2009
PDF: 9 pages
Proc. SPIE 7452, Earth Observing Systems XIV, 74520M (21 August 2009); doi: 10.1117/12.824764
Show Author Affiliations
X. Xiong, NASA Goddard Space Flight Ctr. (United States)
T. Chang, Science Systems and Applications, Inc. (United States)
W. Barnes, Univ. of Maryland, Baltimore County (United States)

Published in SPIE Proceedings Vol. 7452:
Earth Observing Systems XIV
James J. Butler; Xiaoxiong Xiong; Xingfa Gu, Editor(s)

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