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Atmospheric effects on cluster analysesGround reflected radiance, from which information is extracted through techniques of cluster analyses for remote sensing application, is altered by the atmosphere when it reaches the satellite. Therefore it is essential to understand the effects of the atmosphere on Landsat measurements, cluster characteristics and analysis accuracy. A doubling model is employed to compute the effective reflectivity, observed from the satellite, as a function of ground reflectivity, solar zenith angle and aerosol optical thickness for standard atmosphere. The relation between the effective reflectivity and ground reflectivity is approximately linear. It is shown that for a horizontally homogeneous atmosphere, the classification statistics from a maximum likelihood classifier remains unchanged under these transforms. If inhomogeneity is present, the divergence between clusters is reduced, and correlation between spectral bands increases. Radiance reflected by the background area surrounding the target may also reach the satellite. The influence of background reflectivity on effective reflectivity is discussed.
Document ID
19800038287
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Kiang, R. K.
(NASA Goddard Institute for Space Studies New York, N.Y., United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1979
Subject Category
Optics
Meeting Information
Meeting: International Symposium on Remote Sensing of Environment
Location: Ann Arbor, MI
Start Date: April 23, 1979
End Date: April 27, 1979
Accession Number
80A22457
Distribution Limits
Public
Copyright
Other

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