Accession Number : ADP003124

Title :   Principal Components as a Method for Atmospherically Correcting Coastal Zone Color Scanner Data,

Corporate Author : NAVAL OCEAN RESEARCH AND DEVELOPMENT ACTIVITY NSTL STATION MS

Personal Author(s) : Holyer,R. J.

Report Date : OCT 1983

Pagination or Media Count : 21

Abstract : The Coastal Zone Color Scanner (CZCS) images the earth's oceans in five visible/near-IR spectral bands. In the visible portion of the electromagnetic spectrum, satellite observed radiance typically consists of approximately 90% of atmospheric backscatter and 10% of ocean-scattered radiance. Subtle color signatures associated with oceanic features are frequently masked by this atmospheric path radiance. Accurate atmospheric correction of CZCS data is, therefore, a prerequisite to optimum information extraction from this imagery. The most widely accepted atmospheric correction scheme for CZCS data, based on a single scattering model of the atmosphere plus certain assumed optical properties of the ocean, has several inherent drawbacks that limit its effectiveness. Principal Components Analysis, a common pattern recognition tool, is offered as an alternate atmospheric correction scheme based upon a statistical rather than a modeling approach. The Principal Components method is applied to a representative CZCS data set and a comparison is made wth corrections derived by the modeling method. (Author)

Descriptors :   *Statistical processes, *Optical scanning, *Pattern recognition, Oceans, Colors, Radiometers, Atmospherics, Corrections, Electromagnetic spectra, Scattering, Radiance, Signatures

Distribution Statement : APPROVED FOR PUBLIC RELEASE