Surveying and Geoinformatics - Scholarly Publications

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Geoidal Map and Three Dimension Surface Model
(International Journal of Computational Engineering Research (IJCER), Vol. 2. No. 4, pp 52-58., 2013) Olaleye, J. B.; Olusina, J.O; Badejo, O.T; Aleem, K.F
Geoidal map depicts the geoid configuration of the area under study. Data acquisition for the production of such maps has been very tedious, time consuming and expensive with the use of classical and conventional geoid determination methods. "Satlevel" Collocation is a new method of geoid determination in which the ellipsoidal height from any satellite based system is combined with orthometric height from geodetic levelling to model the geoid. The method enables the geoid to be determined in patches. Geoid so determined can be applied with ellipsoidal height to get orthometric height which height users always prefer. In this work, "Satlevel" Collocation model along with the user‟s interactive computer program “Orthometric Height on Fly”, were used to generate geoidal values in part of Port Harcourt metropolis. The generated data was used to produce the Geoidal map of the study area using SURFER software. The map was overlaid on the Local government map of Rivers State of Nigeria. The production of Geoidal map from "Satlevel" Collocation is easier than the conventional methods, when the initial geoidal coefficients have been determined. This method can be extended to other parts of Nigeria and the world at large.