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An information theory approach for evaluating earth radiation budget (ERB) measurements - Nonuniform sampling of diurnal longwave flux variationsSatellite measurements are subject to a wide range of uncertainties due to their temporal, spatial, and directional sampling characteristics. An information-theory approach is suggested to examine the nonuniform temporal sampling of ERB measurements. The information (i.e., its entropy or uncertainty) before and after the measurements is determined, and information gain (IG) is defined as a reduction in the uncertainties involved. A stochastic model for the diurnal outgoing flux variations that affect the ERB is developed. Using Gaussian distributions for the a priori and measured radiant exitance fields, the IG is obtained by computing the a posteriori covariance. The IG for the monthly outgoing flux measurements is examined for different orbital parameters and orbital tracks, using the Earth Observing System orbital parameters as specific examples. Variations in IG due to changes in the orbit's inclination angle and the initial ascending node local time are investigated.
Document ID
19910064732
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Halyo, Nesim
(Information and Control Systems, Inc. Hampton, VA, United States)
Direskeneli, Haldun
(Information and Control Systems, Inc. Hampton, VA, United States)
Barkstrom, Bruce R.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 14, 2013
Publication Date
July 1, 1991
Publication Information
Publication: IEEE Transactions on Geoscience and Remote Sensing
Volume: 29
ISSN: 0196-2892
Subject Category
Cybernetics
Accession Number
91A49355
Funding Number(s)
CONTRACT_GRANT: NAS1-17953
CONTRACT_GRANT: NAS1-16478
Distribution Limits
Public
Copyright
Other

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