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Comparison of third order potential derivatives based on recent satellite-based GGMs and on global isostatic topographic models

Citace:
HAMÁČKOVÁ, E., ŠPRLÁK, M., PITOŇÁK, M., NOVÁK, P. Comparison of third order potential derivatives based on recent satellite-based GGMs and on global isostatic topographic models. Praha, 2015.
Druh: PŘEDNÁŠKA, POSTER
Jazyk publikace: eng
Anglický název: Comparison of third order potential derivatives based on recent satellite-based GGMs and on global isostatic topographic models
Rok vydání: 2015
Autoři: Ing. Eliška Hamáčková , Ing. Michal Šprlák Ph.D. , Ing. Martin Pitoňák Ph.D. , Prof. Ing. Pavel Novák Ph.D. ,
Abstrakt EN: Validation of GOCE-based global geopotential models (GGMs) is a significant topic for both modelers and users. There have already been many studies performed on this topic based on different methods. This study deals with comparison of GOCE-based GGMs with topographic-isostatic models using third-order derivatives of the geopotential. The third-order geopotential derivatives are calculated from various releases of time-wise (TIM) and direct (DIR) GGMs in a regular coordinate grid. New non-singular formulas for spherical harmonic synthesis of third-order potential derivatives are used for this purpose. Third-order derivatives of the gravitational potential generated by isostatically-compensated topography are also computed from topographic-isostatic models. Then the two sets of the third-order derivatives are compared and their correlation is studied in both spatial and spectral domains. Special attention is given to higher-degree spherical harmonics. Also the improvement of various TIM and DIR releases is assessed.
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