Determination of Orthometric Heights Using DGPS

摘要

In 1997 the Florida Department of Transportation (FDOT) approved a University of Florida (UF) research proposal to explore improving the determination of orthometric heights using the Global Positioning System (GPS). The research plan included two major components: (1) Evaluate the precision of GEOID96 over Florida and investigate possible places for improvement; and (2) Develop and test simplified guidelines for the observation of ellipsoid heights using GPS. This report reviews the work performed to improve the gravimetric geoid model and the development and testing of guidelines for the use of GPA to obtain ellipsoid heights of adequate accuracy to be combined with the geoid model to derive orthometric heights accurate to 2 to 5 cm.