000193221 001__ 193221
000193221 003__ CZ-ZdVUG
000193221 005__ 20190208112821.0
000193221 041__ $$aeng
000193221 040__ $$aABC039$$bcze
000193221 1001_ $$aNesvadba, Otakar
000193221 24510 $$aAn improved methodology for precise geoid/quasigeoid modelling
000193221 500__ $$aRIV: RIV/00025615:_____/16:N0000049
000193221 5203_ $$9eng$$aThe paper describes recent development of the computational procedure useful for precise local quasigeoid modelling. The overall methodology is primarily based on a solution of the so-called gravimetric boundary value problem for an ellipsoidal domain (exterior to an oblate spheroid), which means that gravity disturbances on the ellipsoid are used in quality of input data. The problem of a difference between the Earth’s topography and the chosen ellipsoidal surface is solved iteratively, by analytical continuation of the gravity disturbances to the computational ellipsoid. The methodology covers an interpolation technique of the discrete gravity data, which, considering a priori adopted covariance function, provides the best linear unbiased estimate of the respective quantity, numerical integration technique developed on the surface of ellipsoid in the spectral domain, an iterative procedure analytical continuation in ellipsoidal coordinates, remove and restore of the atmospheric masses, an estimate of the far-zones contribution (in a case of regional data coverage) and the restore step of the obtained disturbing gravity potential to the target height anomaly. All the computational steps of the procedure are modest in the consumption of compute resources, thus the methodology can be used on a common personal computer, free of any accuracy or resolution penalty. Finally, the performance of the developed methodology is demonstrated on the real-case examples related to the territories of France (Auvergne regional quasigeoid) and the Czech Republic.
000193221 655_4 $$aanotace
000193221 653_0 $$agravity data prediction$$agravimetric boundary value problem
000193221 7001_ $$aHolota, Petr
000193221 7730_ $$92016
000193221 85642 $$uhttps://www.rvvi.cz/riv?s=rozsirene-vyhledavani&ss=detail&n=0&h=RIV%2F00025615%3A_____%2F16%3AN0000049%21RIV17-GA0-00025615
000193221 910__ $$aABC039
000193221 980__ $$aclanky_vugtk
000193221 980__ $$anesvadba
000193221 985__ $$aholota
000193221 985__ $$aanotace
000193221 985__ $$aO
000193221 985__ $$autvar24
000193221 999C1 $$9CURATOR$$aGA14-34595S - Matematické metody pro studium tíhového pole Země (2014 - 2016)$$bGAČR