Stereo-Photographic Mapping From Submersibles

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Abstract
A program to obtain an optimum system of stereo-photography has been developed which provides complete relief maps from portions of the ocean floor. The program to develop this stereo-photogrammetric system has been sectioned into two phases: a preliminary field test with a "wet" submersible; a final test with a "dry" submersible. The preliminary test phase has so far demonstrated many problem areas but also provides encouraging results: e.g., lens distortions are of the same magnitude as the typical metrogon aerial camera lens; a manned wet submersible can maneuver sufficently to completely photograph a test area of over 2,500 square meters from an altitude of 10 meters above the bottom with at least 56 percent overlap and 15 percent side lap; a block of over 50 photographs which covers this area can yield a complete horizontal solution ( 9 points per photograph) with only 5 ground control points, and vertical bridging is possible on existing photographic equip-ment. Early experiments have shown that while the final phase is feasible, considerable work remains to be done in improving camera systems, positioning systems, and submer-sible performance. This final phase, conducted from a dry submersible, will require a new approach since ground control points are virtually impossible to obtain. Orientation of the photographs will be extrapolated from the submersible's attitude and position.© (1968) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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