Elevation Determination by Using GPS
ARMY TOPOGRAPHIC ENGINEERING CENTER FORT BELVOIR VA
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The Global Positioning System GPS, when used in a differential mode, can be used to obtain very accurate heights relative to an ellipsoid. Questions have been raised as to how accurate GPS can be used to obtain elevations based on the geoid. Several field techniques i.e. local geoid modeling as well as geoid modeling software have been developed in order to use GPS to obtain elevations based on the geoid. This paper will present analysis and results of testing performed by running a level loop with Differential GPS DGPS and conventional spirit leveling. The testing was performed in Alexandria, VA on 1618 May 1994 by members of the Surveying Division of the Topographic Engineering Center. Global positioning system, Surveying, Differential GPS, Rapid static, Short occupation times of 5-20 minutes per station.
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