GPS Derived Orthometric Height for Small Engineering Surveys
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Date
2009-03
Authors
OLALEYE, J.B.
ISIOYE, O.A.
ABIODUN, O.E.
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Engineering Research, Faculty of Engineering, University of Lagos.
Abstract
Global Positioning System (GPS) measures heights related to the ellipsoid. GPS height differences do not reflect the direction of flow under the influence of gravity and are not physically meaningful. This makes heights from GPS of little or no use in engineering surveys and geophysical explorations, many engineering applications require heights that are related to a physically meaningful surface such as the geoid. Such physically meaningful heights are the orthometric heights. This paper reviews the different error sources affecting GPS determined heights and demonstrates the use of geometric (local) geoid model for determining orthometric heights from GPS levelling as may be required for small engineering projects.
Description
Scholarly article
Keywords
Ellipsoidal Heights , Orthometric Heights , geoid , GPS , Research Subject Categories::TECHNOLOGY
Citation
J.B. Olaleye, O. A. Isioye and O. E. Abiodun (2009), GPS Derived Orthometric Height for Small Engineering Surveys: Journal of Engineering Research, Faculty of Engineering, University of Lagos, JER 14, No. 1, PP. 21 - 31