Chapter
Dec 31, 2015
Sequential Photography of Coastal Water
Publication: Coastal Engineering 1972
Abstract
Sequential photographs from aircraft and satellites provide a source of data for studying dynamic features of coastal waters. Procedures for detecting features in sequential photos follow two approaches; (1) application of sequential signatures, (2) simple comparative analysis. For quantitative analyses images of two or more frames must have proper registration and comparable tones, i.e. tones free of photographic variance from film processing, varying exposure and solar illumination. After a normalization correction for variance is determined through use of density control points, density of successive frames is measured with a microdensitometer, the correction is appplied and tonal differences determined. Such differences relate to the time character of a feature and to causal processes. Application of correction values and numerical differencing is best accomplished in a digital or computerized densitometer. However, corrections and differencing can also be accomplished graphically from line traces or plots of an objective densitometer. Application of the procedures is demonstrated by analyses of tonal patterns of suspended sediment concentration in an estuary.
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© 1973 American Society of Civil Engineers.
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Published online: Dec 31, 2015
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Maynard M. Nichols
Associate Professor Virginia Institute of Marine Science Gloucester Point, Virginia 23062
Notes
1
Contribution 493 of the Virginia Institute of Marine Science
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