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Applications of Underwater Photogrammetry

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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.

Tests with the submersibles Star III and Aluminaut have shown that contoured strip maps can be made with parallel mounted cameras. This arrangement allows for the computations of the camera height and gives some indication of the bottom attitude. This additional information along with ground coordinates at each exposure station provides sufficient data to compile a map.
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Document Type: Research Article

Publication date: 2006-06-01

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  • The Marine Technology Society Journal is the flagship publication of the Marine Technology Society. It publishes the highest caliber, peer-reviewed papers on subjects of interest to the society: marine technology, ocean science, marine policy and education. The Journal is dedicated to publishing timely special issues on emerging ocean community concerns while also showcasing general interest and student-authored works.
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