Using Newton's law and geophysical bounds on mass density contrast to ensure consistency between gravity and height data |
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| Institution: | 1. Astronomical Institute, Czech Academy of Sciences, Fri?ova 298, CZ 251 65 Ond?ejov, Czech Republic;2. Research Institute of Geodesy, Topography and Cartography, CZ 250 66 Zdiby 98, Czech Republic;3. Faculty of Mining and Geology, VSB-TU Ostrava, CZ 708 33 Ostrava, Czech Republic;4. Faculty of Civil Engineering, Czech Technical Univeristy in Prague, CZ 166 29 Praha 6, Czech Republic;1. Programa de Pós–Graduação em Geodinâmica e Geofísica, Universidade Federal do Rio Grande do Norte, 59078–970 Natal, RN, Brazil;2. INCT–GP, Instituto Nacional de Geofísica do Petróleo (CNPq/CAPES), Brazil;3. Department of Geoscience, Aarhus University, DK-8000 Aarhus C, Denmark;4. Serviço Geológico do Brasil (CPRM), Brazil |
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| Abstract: | In this paper we advocate the use of Newton's law of gravitational attraction to ensure perfect consistency between gravity and height data. Starting with the absolute gravity on the topography we decompose this signal into a number of quantities associated with physics of the system. To model gravitational attraction from topography we use DTM and Newton's law of gravitational attraction. A residual part of the gravity signal is interpreted as inconsistency between gravity and heights. In the paper we discuss a method by which such inconsistency (at least in principle) can be decomposed into a “gravity error” and a “terrain error”. In practice such separation is not possible because the two types of error are nearly 100% correlated. The inconsistency can be interpreted as a measure of ambiguity of the gravity-terrain models which are consistent with a set of measured/interpolated data. We discuss the influence of such ambiguity on the accuracy of the geoid for the investigated area of Jutland, Denmark. |
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