Comparison of three methods for the downward continuation of the gravitational gradients
ŠPRLÁK, M., NOVÁK, P., VALKO, M., SEBERA, J. Comparison of three methods for the downward continuation of the gravitational gradients. Edinbourgh, 2013.
|Anglický název:||Comparison of three methods for the downward continuation of the gravitational gradients|
|Autoři:||Ing. Michal Šprlák Ph.D. , Prof. Ing. Pavel Novák Ph.D. , Miloš Valko Ph.D. , Ing. Josef Sebera PhD. ,|
|Abstrakt EN:||The satellite gravitational gradiometry mission GOCE provides, among other products, gravitational gradients along the satellite?s orbit. For geophysical applications, knowledge of the gravitational gradients at lower altitudes is required. In such a case, one has to deal with the downward continuation problem. Numerous methods have been proposed for downward continuation of potential field data. In this study, iterative, inverse, and direct evaluation methods are compared when gravitational gradients reduced to mean orbital radius are continued onto gravitational gradients at internal spherical surfaces. Several altitudes above the Earth surface and discretization sizes of input gradient grids are considered. Rigorous integration kernels are exploited in our numerical experiments.|