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Evaluation of Shortwave Infrared Atmospheric Correction for Ocean Color Remote Sensing of Chesapeake BayThe NASA Moderate Resolution Imaging Spectroradiometer onboard the Aqua platform (MODIS-Aqua) provides a viable data stream for operational water quality monitoring of Chesapeake Bay. Marine geophysical products from MODIS-Aqua depend on the efficacy of the atmospheric correction process, which can be problematic in coastal environments. The operational atmospheric correction algorithm for MODIS-Aqua requires an assumption of negligible near-infrared water-leaving radiance, nL(sub w)(NIR). This assumption progressively degrades with increasing turbidity and, as such, methods exist to account for non-negligible nL(sub w)(NIR) within the atmospheric correction process or to use alternate radiometric bands where the assumption is satisfied, such as those positioned within shortwave infrared (SWIR) region of the spectrum. We evaluated a decade-long time-series of nL(sub w)(lambda) from MODIS-Aqua in Chesapeake Bay derived using NIR and SWIR bands for atmospheric correction. Low signal-to-noise ratios (SNR) for the SWIR bands of MODIS-Aqua added noise errors to the derived radiances, which produced broad, flat frequency distributions of nL(sub w)(lambda) relative to those produced using the NIR bands. The SWIR approach produced an increased number of negative nL(sub w)(lambda) and decreased sample size relative to the NIR approach. Revised vicarious calibration and regional tuning of the scheme to switch between the NIR and SWIR approaches may improve retrievals in Chesapeake Bay, however, poor SNR values for the MODIS-Aqua SWIR bands remain the primary deficiency of the SWIR-based atmospheric correction approach.
Document ID
20110015443
Document Type
Reprint (Version printed in journal)
Authors
Werdell, P. Jeremy (Science Systems and Applications, Inc. Lanham, MD, United States)
Franz, Bryan A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Bailey, Sean W. (FutureTech Corp. Greenbelt, MD, United States)
Date Acquired
August 25, 2013
Publication Date
October 15, 2010
Publication Information
Publication: Remote Sensing of Environment
Volume: 114
Issue: 10
Subject Category
Earth Resources and Remote Sensing
Report/Patent Number
GSFC.JA.4813.2011
Distribution Limits
Public
Copyright
Other