REMOTE SENSING OF COASTAL WATERS USING MULTISPECTRAL PHOTOGRAPHIC TECHNIQUES.
Final technical rept.,
LONG ISLAND UNIV GREENVALE N Y SCIENCE ENGINEERING RESEARCH GROUP
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An evaluation of multispectral photographic techniques for optical penetration of water in Northeastern United States and Gulf of Mexico coastal waters showed the green spectral band to maximize the detectability of underwater targets. This type of particulant matter in suspension in the water as well as the size and quantity of the particles significantly affects the ability to optically penetrate water. In general, the spectral band 493-543nm when exposed to place the water mass at about unity density on the photographic emulsion, was found to give the best water penetration independent of altitude or time of day as long as solar glitter from the surface of the water was avoided. When optimally exposed, the images of surface and underwater objects showed greater chromatic enhancement in multispectral color renditions than on conventional Aerial Ektachrome color films. Multispectral negative color renditions were found to be equally as good as positive color images for achieving color differences between the water mass and submerged objects. An isoluminous color technique has been perfected. This photographic process eliminates the dimension of brightness from a multispectral color presentation. By this method, objects exhibiting subtle spectral differences which are normally obscured by the comparatively large brightness present in coastal waters can be detected. Author
- Military Operations, Strategy and Tactics