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MODIS Aqua Optical Throughput Degradation Impact on Relative Spectral Response and Calibration on Ocean Color ProductsSince Moderate Resolution Imaging Spectroradiometer Aqua's launch in 2002, the radiometric system gains of the reflective solar bands have been degrading, indicating changes in the systems optical throughput. To estimate the optical throughput degradation, the electronic gain changes were estimated and removed from the measured system gain. The derived optical throughput degradation shows a rate that is much faster in the shorter wavelengths than the longer wavelengths. The wavelength-dependent optical throughput degradation modulated the relative spectral response (RSR) of the bands. In addition, the optical degradation is also scan angle-dependent due to large changes in response versus the scan angle over time. We estimated the modulated RSR as a function of time and scan angles and its impacts on sensor radiometric calibration for the ocean science. Our results show that the calibration bias could be up to 1.8 % for band 8 (412 nm) due to its larger out-of-band response. For the other ocean bands, the calibration biases are much smaller with magnitudes at least one order smaller.
Document ID
20170008463
Document Type
Reprint (Version printed in journal)
Authors
Lee, Shihyan (Science Applications International Corp. McLean, VA, United States)
Meister, Gerhard (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
September 5, 2017
Publication Date
June 5, 2017
Publication Information
Publication: IEEE Transactions on Geoscience and Remote Sensing
Volume: 55
Issue: 9
ISSN: 0196-2892
Subject Category
Earth Resources and Remote Sensing
Oceanography
Report/Patent Number
GSFC-E-DAA-TN45887
Funding Number(s)
CONTRACT_GRANT: NNG14HZ03C
Distribution Limits
Public
Copyright
Other