Author: Ameh Benjamin Mgbede
Department: Surveying and Geoinformatics
Affiliation: Nnamdi Azikiwe University Awka
The subject under consideration is a research work on the determination of components of the deflection of the vertical of Lobi area in Makurdi, Benue State using Geometric Method. The Geometric method of determining components of the deflection of the vertical involves the practical integration of Global Positioning System (GPS) GNSS observations and Precise leveling techniques. The results of the observations were used to compute the components of vertical deflection using the Least Squares adjustments. Using the method described, the deflections of the vertical components of the test point were determined. The estimated parameters are -3.18 ±0.60 and -2.25±0.43 arc seconds for the north-south and east-west components; respectively. The deflection of the vertical components at the same station was calculated using the EGM96 and EGM2008 spherical harmonic models. The associated standard errors of the processed vectors of the network were computed. The results obtained in magnitude are significant findings, demonstrating the ability of the method to resolve the deflection of the vertical components from GPS and precise leveling observations in local areas.
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