Accession Number:

ADP003124

Title:

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

Descriptive Note:

Corporate Author:

NAVAL OCEAN RESEARCH AND DEVELOPMENT ACTIVITY NSTL STATION MS

Personal Author(s):

Report Date:

1983-10-01

Pagination or Media Count:

21.0

Abstract:

The Coastal Zone Color Scanner CZCS images the earths oceans in five visiblenear-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

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE