Research Article
Nov 1971
Aerial Color Analyses of Water Quality
Authors: Kenneth R. Piech and John E. WalkerAuthor Affiliations
Publication: Journal of the Surveying and Mapping Division
Volume 97, Issue 2
Abstract
A new technique utilizing color photography in aerial water analysis is described. The technique termed the scene color standard (SCS) technique, uses natural objects in the photographic image to remove peripheral effects in the water quality measurement. The color of a body of water is shown to depend upon: (1) source effects, (2) atmospheric effects, (3) surface reflection effects, and (4) volume effects. These phenomena are reviewed, and volume spectral reflectance is shown to be the only definition of water color sensitive to water quality. All other color effects are peripheral effects, and can be described by three parameters: α; α' and β. Crucial to the SCS technique is use of shadow information; information traditionally of limited value to the photointerpreter. The technique is applied to measurement of chlorophyll content in Lake Chautauqua in New York State. Reflectances of ground objects are shown to be in excellent agreement with the aerial data.
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Published In
Journal of the Surveying and Mapping Division
Volume 97 • Issue 2 • November 1971
Pages: 185 - 197
Copyright
© 1971 American Society of Civil Engineers.
History
Published in print: Nov 1971
Published online: Feb 12, 2021
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Authors
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Kenneth R. Piech
Principal Physicist, Cornell Aeronautical Laboratory, Inc., Buffalo, N.Y.
John E. Walker
Principal Engr., Cornell Aeronautical Laboratory, Inc., Buffalo, N.Y.
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