17 December 1992 Airborne laser bathymetry: a novel technique for shallow-water monitoring
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Proceedings Volume 1714, Lidar for Remote Sensing; (1992) https://doi.org/10.1117/12.138511
Event: Environmental Sensing '92, 1992, Berlin, Germany
Abstract
Attention is given to airborne laser bathymetry, a new tool which allows very rapid hydrographic surveys to be conducted in shallow waters without the common marine navigation difficulties. A pulsed laser carried on board a plane or a helicopter sends an ultrashort luminous pulse to the sea bed. This pulse is located in the blue-green spectrum where sea water is the least absorptive. The pulse propagates with practically no attenuation to the surface of the water, where a first echo is retransmitted to the receiver due to the difference between the air and water index. When the pulse passes through the water, the suspended particles of organic origin (plankton) or mineral origin (sediment) diffuse the light transmitted and produce a diffused echo along the water column. On contact with the sea bed, a final echo, the amplitude of which will depend on the bottom type, is transmitted. Laser bathymetry is expected to reduce survey cost by a factor of 3. The instrument's mobility implies that areas far away from one another can be surveyed on the same day.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gilles Kervern, Gilles Kervern, Andre Le Gall, Andre Le Gall, Bernard Toullec, Bernard Toullec, } "Airborne laser bathymetry: a novel technique for shallow-water monitoring", Proc. SPIE 1714, Lidar for Remote Sensing, (17 December 1992); doi: 10.1117/12.138511; https://doi.org/10.1117/12.138511
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