THE EGYPTIAN GEOID BY THREE INTEGRAL TECHNIQUES Raaed Mohamed Kame1 Hassouna | ||
| ERJ. Engineering Research Journal | ||
| Article 9, Volume 32, Issue 1, January 2009, Pages 83-88 PDF (425.22 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/erjm.2009.69392 | ||
| Author | ||
| Raaed Hassouna | ||
| Department of Civil Engineering, Faculty of Engineering Minoufiya University, Shebin El-Kom, Egypt | ||
| Abstract | ||
| In this study, a comparison was held among the Stokes, Hotine and Deflection-geoid formulae for gravimetric geoid modelling in Egypt, regarding the resulting statistical geoid features and accuracies. For this purpose, relevant 2' x 2' grids of gravity anomalies, graviv disturbances and vertical deflection components were input, yielding 2' x 2' detailed geoid models. The comparison showed that the Stokes and Hofine methods yielded practically the same geoid features and accuracy. The Deflection-geoid technique showed different geoid features and significalrtly better accuracy. The comparison of the three geoid solutions at independent GPSLeveling control, showed that the mean and standard deviation of discrepancies, pertaining to the Deflection-geoid formula, are less by about 36% and 8%, respectively, compared to those relevant to the other two formulae. Therefore, the vertical deflections are recommended as homogeneous input data lype in gravimetric geoid detehination. | ||
| Keywords | ||
| Integral formula; Hotine; Deflection-geoid | ||
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