Abstract
The quality and efficiency of geoid models have been developed rapidly to provide elevations instead of traditional surveying. The high cost and the long measurement time of surveying instrumentation cause an urgent need for deriving local Earth Geoid Model (EGM). Hundred control points are selected on the study area topographic map. The study area is located in Mosul city in Iraq. Multiple earth geoid models have been derived using different interpolation methods available in ArcGIS environment. The results of statistical analysis determine the best interpolation method. The percentage root mean square errors (RMSEs) for the adapted interpolation methods are 26.54 %, 28.43 %, 30.13 %, 34.79 %, 36.75 %, and 37.28 % in kriging, Inverse Distance Weighted (IDW), Trend, Natural Neighbor, Spline, and Topo To Raster, respectively. Kriging interpolation gives minimum standard deviation (2.226 m) and RMSE (2.654 m) so it is the preferable method. The results indicate that the geoid is departed from GPS Visualizer data by the mean value of minus (1.405 m) in the study area.
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