Applications of Underwater Photogrammetry
NAVAL OCEANOGRAPHIC OFFICE NSTL STATION MS
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The reliability of a photogrammetric system is a function of the degree of constraints applied to the system. Mapping tests have been performed to investigate the relative importance of these constraints. Underwater mapping consists of five elements 1 ground control, 2 photogrammetric equipment, 3 field techniques, 4 photogrammetric analyses, and 5 final presentation. Ground control was provided by a 160 foot square underwater net. A photogrammetric camera was improvised by calibrating a hand-held 70mm water corrected underwater camera, which was mounted to the wet submersible PEGASUS. Photogrammetric analyses were performed by assembling a radial line plot for a horizontal control solution and employing this horizontal control for a vertical bridge of three models. The result was an establishment of over 1200 additional horizontal points, a planimetric map of the entire area, a detailed, one inch, contoured map of the three models, and a photo-mosaic of the area.
- Cartography and Aerial Photography