Geodetski list, Vol. 55 (78) No. 1, 2001.
Izvorni znanstveni članak
Impact of the Surface Rock Density on Geoid Undulations
Boško Pribičević
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Damir Medak
; Geodetski fakultet Sveučilišta u Zagrebu, Zagreb, Hrvatska
Sažetak
GPS-technology provides efficient and accurate determination of ellipsoidal, geometrical heights of the points on the Earth's surface. Knowledge of accurate geoid undulations allows for simple transformation from the geometrical model to the physical reality, i.e. calculation of orthometric or normal-orthometric heights from ellipsoidal heights. The impact of surface rock density was usually negligible in determination of geoid undulations. The reason behind was inadequacy of density models and the estimation that the result of calculation shall be practically the same as the result without using the density model. This paper shows that a detailed digital model of density improves the quality of solution for the model of the geoid, wheras the area of the City of Zagreb was used as the running example. The hypothesis was proven, partly because the accuracy of the geoid determination was improved to such extent that previously neglected differences became significant. This improvement was possible because new measurements were used and the results obtained are presented for the first time in this paper, yielding new scientific insight.
Ključne riječi
geoid; digital density models; physical geodesy
Hrčak ID:
290775
URI
Datum izdavanja:
31.3.2001.
Posjeta: 199 *