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Proceedings Paper

On-orbit performance of the MODIS SWIR bands
Author(s): Amit Angal; Aisheng Wu; Xiaoxiong Xiong; Xu Geng; Daniel O. Link; Hongda Chen
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Paper Abstract

The 36 MODIS spectral bands, with wavelengths ranging from 0.41 μm to 14.2 μm, are distributed on four focal plane assemblies: visible (VIS), near-infrared (NIR), short- and mid-wave infrared (SMIR), and long-wave infrared (LWIR). The MODIS reflective solar bands (RSB) are calibrated onorbit using a solar diffuser (SD), with its reflectance degradation monitored using a solar diffuser stability monitor (SDSM). The Terra MODIS SD degradation at 0.936 μm, as measured by the SDSM, is 2.4% after 14 years on-orbit. The Aqua MODIS SD degradation at 0.936 μm is 0.6% after 12 years on-orbit. The SWIR bands with spectral wavelengths centered at 1.24 μm (band 5), 1.37 μm (band 26), 1.64 μm (band 6), and 2.13 μm (band 7), are beyond the SDSM wavelength coverage (0.412 μm to 0.936 μm). Consequently, the gain of the SWIR bands is computed without factoring in the possible degradation of the SD. A technique to monitor the long-term stability of the MODIS SWIR bands is developed using pseudo-invariant desert targets. Results indicate a long-term drift of up to 1.5% of band 5 of Terra MODIS. The long-term stability of other Terra MODIS SWIR bands is seen to be within 0.5%. Similar results for Aqua MODIS indicate no observable drift, with changes within 0.5%. An implementation strategy to account for this correction in the MODIS Level 1 B (L1B) is also discussed.

Paper Details

Date Published: 19 November 2014
PDF: 10 pages
Proc. SPIE 9264, Earth Observing Missions and Sensors: Development, Implementation, and Characterization III, 92641Q (19 November 2014); doi: 10.1117/12.2069308
Show Author Affiliations
Amit Angal, Science Systems and Applications, Inc. (United States)
Aisheng Wu, Sigma Space Corp. (United States)
Xiaoxiong Xiong, NASA Goddard Space Flight Ctr. (United States)
Xu Geng, Sigma Space Corp. (United States)
Daniel O. Link, Sigma Space Corp. (United States)
Hongda Chen, Sigma Space Corp. (United States)


Published in SPIE Proceedings Vol. 9264:
Earth Observing Missions and Sensors: Development, Implementation, and Characterization III
Xiaoxiong Xiong; Haruhisa Shimoda, Editor(s)

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