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Removal of Thin Cirrus Path Radiances in the 0.4-1.0 micron Spectral Region Using the 1.375-micron Strong Water Vapor Absorption ChannelThrough analysis of spectral imaging data acquired with the Airborne Visible Infrared Imaging Spectrometer (AVIRIS) from an ER-2 aircraft at 20 km altitude during several field programs, it was found that narrow channels near the center of the strong 1.38-micron water vapor band are very sensitive in detecting thin cirrus clouds. Based on this observation from AVIRIS data, a channel centered at 1.375 microns with a width of 30 nm was selected for the Moderate Resolution Imaging Spectrometer (MODIS) for remote sensing of cirrus clouds from space. The sensitivity of the 1.375-micron MODIS channel to detect thin cirrus clouds during the day time is expected to be one to two orders of magnitude better than the current infrared emission techniques. As a result, a larger fraction of the satellite data will likely be identified as containing cirrus clouds. In order to make better studies of surface reflectance properties, thin cirrus effects must be removed from satellite images. We have developed an empirical approach for removing/correcting thin cirrus effects in the 0.4 - 1.0 micron region using channels near 1.375 microns. This algorithm will be incorporated into the present MODIS atmospheric correction algorithms for ocean color and land applications and will yield improved MODIS atmospheric aerosol, land surface, and ocean color products.
Document ID
20000064537
Document Type
Conference Paper
Authors
Gao, Bo-Cai (Naval Research Lab. Washington, DC United States)
Kaufman, Yoram J. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Han, Wei (Sachs/Freeman Associates, Inc. Landover, MD United States)
Wiscombe, Warren J. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 19, 2013
Publication Date
December 19, 1998
Publication Information
Publication: Summaries of the Seventh JPL Airborne Earth Science Workshop January 12-16, 1998
Volume: 1
Subject Category
Meteorology and Climatology
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle20000064520Analytic PrimarySummaries of the Seventh JPL Airborne Earth Science Workshop January 12-16, 1998
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