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Proceedings Paper

Subsample difference correction for Terra MODIS SWIR bands 5-7 using lunar observations
Author(s): Truman Wilson; Xiaoxiong Xiong
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Paper Abstract

The Moderate Resolution Imaging Spectroradiometer (MODIS) is one of the key instruments on board the Terra (EOS AM-1) spacecraft. MODIS has 36 spectral bands ranging in wavelength between 0.4 and 14.2 μm, at three spatial resolutions of 250 m (bands 1 2), 500 m (bands 3 7), and 1 km (bands 8 36). For each 1-km sample, the 250-m and 500-m bands use 4 and 2 detectors with each acquiring 4 and 2 subsamples respectively in order to maintain consistent along-scan and along-track resolutions at nadir. The SWIR bands, 5 - 7 and 26, share the same focal-plane array as the 1-km thermal emissive bands, 20 25. During one of the two 500-m subsamples for bands 5 - 7, sampling of the 1-km bands introduces increased electronic crosstalk contamination, resulting in a subsample difference for both Earth-view and on-board calibrator observations. For this work, we use data from lunar and on-board blackbody observations, which occur at different signal levels for bands 20 - 25, to derive a correction to the contamination. This correction can be applied to reduce the subsample differences in the MODIS Earth-view data over a wide range of scenes. The impact of this correction on the sensor calibration and Earth-view data will be assessed.

Paper Details

Date Published: 25 September 2018
PDF: 12 pages
Proc. SPIE 10785, Sensors, Systems, and Next-Generation Satellites XXII, 107851B (25 September 2018); doi: 10.1117/12.2324968
Show Author Affiliations
Truman Wilson, Science Systems and Applications, Inc. (United States)
Xiaoxiong Xiong, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 10785:
Sensors, Systems, and Next-Generation Satellites XXII
Steven P. Neeck; Philippe Martimort; Toshiyoshi Kimura, Editor(s)

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