GEOID MODELLING PROM VERTICAL DEFLECTIONS AND GRAVITY DISTURBANCES: THE EFFECT OF CAP SIZE | ||||
| ERJ. Engineering Research Journal | ||||
| Article 8, Volume 32, Issue 1, January 2009, Page 77-81 PDF (257.44 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/erjm.2009.69391 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| Raaed M. K. Hassouna; Fahmy F. F. Asal | ||||
| Department of Civil Engineering, Faculty of Engineering, Minoufiya University, Shebin El-Kom, Egypt | ||||
| Abstract | ||||
| In this paper, the effect of integration cap size on geoid determination was studied, when using gravity disturbances and vertical deflection as input data. For this purpose, a series of varying cap radii was used to predict gravimetric geoidal heights at discrete GPS-Benchmarks, using both the Hotine and deflection-geoid techniques. In both cases, the results showed significant dependence of the resulting geoid accuracy on the integration cap size. The two methods showed comparable behavior in the vicinity of the cap radius, which is consistent wit? the maximal resolution of the reference geopotential model. At larger cap sizes, the perfomance of the deflection data type was significantly better than the gravity disturbances, which in turn showed a dramatic degradation of the geoid accuracy. Therefore, when solving for the geoid without modifying the integration kemel, it is strongly recommended to nse large cap sizes along with the deflection-geoid method. If gravity disturbances are to be used for geoid determination, then it is recommended to use as small integration cap as possible. | ||||
| Keywords | ||||
| Ceoid; cap size; gravity; deflection | ||||
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