Preliminary results of the establishment of a marine geodetic point in the Pacific Ocean |
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| Authors: | A G Mourad J H Holdahl and N A Frazier |
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| Institution: | (1) Columbus Laboratories, Battelle Memorial Institute, Columbus, USA |
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| Abstract: | In November 1968, a marine geodetic control point was established in the Pacific Ocean at a water depth of6,200 feet. The control point (reference point) consists of three underwater acoustic transponders, two of which are powered with
lead-acid batteries and the third with an underwater radioisotope power source “URIPS” with a10- to20- year life expectancy. Four independent measuring techniques (LORAC airborne line-crossing, satellite, ship inertial, and
acoustic techniques) were used to measure and determine the coordinates of the control point. Preliminary analysis of the
acoustic and airborne data indicates that high accuracies can be achieved in the establishment of geodetic reference points
at sea. Geodetic adjustment by the method of variation of coordinates yielded a standard point error of±50 to±66 feet in determining the unknown ship station. The original location of the ship station as determined by shipboard navigation
equipment was off by about1,600 feet.
Paper previously published in the Proceedings of the Second Marine Geodesy Symposium of the Marine Technology Society. |
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