Orthometric Heights Determination without Geoidal Model Using GPS

Yosef Melzer, Moshe Rosenblum and Yaron Felus

Abstract:	Survey of Israel is remapping an area of 1,600 square kilometers in southern Israel, using 1:40,000 scale aerial photographs. In this area only a few 3D national control points were available, and no reliable geoidal model could be applied. An attempt was made therefore to determine whether GPS could provide a satisfactory geodetic control, including determination of orthometric heights. The approach was based on measurement of the geoid slope between two successive points and conversion of the differential ellipsoidal heights (GPS) to d.itTerential orthometric heights. The method is simple and cost effdve. The results indicate that the method may be used in cases where no undulation model is available and the needed height accuracy is decimeter level.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	1263 - 1267
Cite this article:	Melzer, Yosef, Rosenblum, Moshe, Felus, Yaron, "Orthometric Heights Determination without Geoidal Model Using GPS," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 1263-1267.
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