Results 141 to 150 of about 1,485 (184)

On the possible thermal nature of the largest undulations of the geoid

Tectonophysics, 1977
Abstract It is assumed that major undulations of the geoid are generated by isolated anomalous masses. The idea of the method is to find depth of the equivalent point source of the anomaly and to correct this value for source flattening. It is found that, on the average, the depths of the mass centres of the largest anomalies lie in the range of 360 ...
Yu.A. Tarakanov, L.P. Vinnik, N.A. Chujkova   +2 more
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On calculation of the vertical deflection and the geoid undulation from gravity anomalies

Izvestiya, Physics of the Solid Earth, 2010
Specific features of the calculation of the vertical deflection and the geoidal undulation in the Arctic from gravity anomalies are discussed. Basic requirements to the initial model of the anomalous field are described. The technique of calculating the vertical deflection with arbitrarily fine detail is proposed.
E. A. Boyarsky, L. V. Afanasyeva, V. N. Koneshov, Yu. E. Rozhkov   +3 more
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Use of potential coefficient models for geoid undulation determinations using a spherical harmonic representation of the height anomaly/geoid undulation difference

Journal of Geodesy, 1997
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On the Pratt and Airy models of isostatic geoid undulations

Journal of Geodynamics, 1998
Abstract Usually the topographic-isostatic geoid undulation is derived by a downward continuation of the external potential to the geoid. Unfortunately, such an approach merely yields a fictitious potential at the continental geoid within the topographic masses.
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Methods for the computation of geoid undulations from potential coefficients

Bulletin géodésique, 1971
The undulations of the geoid may be computed from spherical harmonic potential coefficients of the earth’s gravitational field. This paper examines three procedures that reflect various points of view on how this computation should be carried out. One method requires only the flattening of a reference ellipsoid to be defined while the other two methods
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Modifying Stokes' function to reduce the error of geoid undulation computations

Journal of Geophysical Research: Solid Earth, 1981
A comparison is made of the errors in determining the geoid undulation according to the conventional Molodenskii truncation theory and its modifications as suggested by Molodenskii (1958) and Meissl (1971). The undulation is assumed to be computed from gravity anomalies in a spherical cap and a finite set of harmonic potential coefficients (e.g., GEM 9
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The equatorial radius of the Earth and the zero-order undulation of the geoid

Journal of Geophysical Research, 1967
Recent determinations of equatorial gravity, the earth’s flattening, and the product of the gravitational constant and the earth’s mass have been combined to yield an equatorial radius and the potential of the geoid. These elements make it possible to determine the zero-order undulation that must be added to the undulation obtained from the Stokes ...
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The determination of geoid undulations and gravity anomalies from SEASAT altimeter data

Journal of Geophysical Research: Oceans, 1983
The global SEASAT altimeter data set has been edited and adjusted using a crossing arc procedure fixing one long arc to provide control. In doing this a set of 168 master arcs were formed from repeat and near repeat arcs. The adjustment, carried out by D. Rowlands, was done in a global net, and four regional areas.
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On the gravimetric undulations of the geoid and the deflections of the vertical

Geofisica pura e applicata, 1958
The author mentions the aims of the World-wide gravity project he established in the Ohio State University in Columbus, in 1950. He outlines the practical procedure of the gravimetric computations of the undulationsN and the vertical deflection components ξ and η and emphasizes that only by the global international cooperation and additional gravity ...
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General Scheme for the Computation of Regional Geoid Undulations Using Spherical Wavelets

2002
Usually the geoid undulations are modelled by means of an expansion in terms of spherical harmonics. One of the most important disadvantages of this representation is the fact that local changes of the geoid affect all coefficients. Thus, an appropriate model of the geoid undulations may consist of an expansion in terms of spherical harmonics for the ...
M. Schmidt, W. Martínez, J. Florez
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