| Institution: | (1) Geophysical Institute, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava, 845 28, Slovak Republic;(2) Department of Civil Engineering, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia;(3) Institute of Meteorology and Geophysics, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria;(4) Department of Geodesy and Geomatics Engineering, University of New Brunswick, P.O. Box 4400, Fredericton, N.B., E3B 5A3, Canada;(5) Research Institute of Geodesy, Topography and Cartography, Ondřejov, 244, 251 65, Czech Republic;(6) Department of Mathematics, University of Western Bohemia, Univerzitní 8, 306 14 Plzeň, Czech Republic;(7) Faculty of Aerospace Engineering, Physical and Space Geodesy (PSG), Kluyverweg 1, 2629 HS Delft, The Netherlands |
| Abstract: | This paper revisits several aspects of defining and computing the anomalous gravity data for purposes of gravimetric inversion/interpretation.
Attention is paid to evaluation of a refined global topographic correction to the gravity disturbance based on the reference
ellipsoid (RE) and constant reference density for solid topography onshore and sea water density for liquid topography offshore.
The global bathymetric correction is discussed. Two issues associated with compilation and inversion of bathymetrically and
topographically corrected gravity disturbances in regions of negative ellipsoidal (geodetic) heights are pointed out: the
evaluation of normal gravity and the harmonic continuation of the gravity data. Stripping, the removal of an effect of a known
density contrast, is considered also for additional geological elements such as lakes, glaciers, sedimentary basins, isostatic
mountain roots, etc. The stripping corrections are discussed in the context of the gravimetric inverse problem. |
