Active/Passive Optical Hydrography
1990
Haimbach, Stephen P. | Kalcic, Maria T. | Lingsch, Stephen C. | Harris, Michael C.
The Airborne Bathymetric Survey (ABS) concept was adopted by the Defense Mapping Agency and the Navy in 1985. The ABS system combines two independent sensors, an active lidar and a passive multispectral scanner using GPS satellite data for positioning, into one integrated system. The objective of the developmental effort was to build a system that is capable of rapidly charting coastal bathymetry from an aircraft in a variety of environmental conditions and to provide the software and algorithms necessary to process the data. The laser sounder and the multispectral scanner collect data in swaths beneath the aircraft. At an altitude of 500 meters, the swath width are about 270 and 840 meters, respectively. Since both are optical sensors, their bottom detection capabilities were limited by the water clarity. In relatively clear coastal waters they were able to measure depths down to 3 optical depths.
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