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Author: Helmut Moritz
Publisher:
ISBN:
Category : Boundary value problems
Languages : en
Pages : 780
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Author: Helmut Moritz
Publisher:
ISBN:
Category : Boundary value problems
Languages : en
Pages : 780
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Author: Richard H. Rapp
Publisher:
ISBN:
Category : Geodesy
Languages : en
Pages : 76
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Book Description
Various determinations of the harmonic coefficients in the expansion of the earth's gravitational field have been compared in terms of geoids and gravity anomalies. The most recent satellite solution of Anderle agrees fairly well (when comparing common coefficients) with the Gaposchkin solution (RMS difference = plus or minus 5.9 m) but does not agree well with the recent Kaula field from combined satellite and terrestrial data (RMS difference = plus or minus 9.2 m). Estimates made of the effect of the higher-order terms on the undulation values were used to estimate the over-all accuracy figure for current solutions as plus or minus 9.9 m. The error committed by neglecting terms higher than n=8 was estimated as plus or minus 6 m; beyond n=12, plus or minus 4 m; and beyond n=15, plus or minus 3 m. Comparisons of the solutions for various size blocks showed better agreement, the larger the blocks. Accuracy estimates for mean anomaly evaluations from the current satellite solutions were: 5 degrees x 5 degrees, plus or minus 15 mgal; 10 degrees x 10 degrees, plus or minus 12 mgal; 15 degrees x 15 degrees, plus or minus 10 mgal; 20 degrees x 20 degrees, plus or minus 7 mgal; and 30 degrees x 30 degrees, plus or minus 3 mgal. Comparisons of the satellite anomalies were also made to terrestrial anomalies in 5 degrees x 5 degrees and 30 degrees x 30 degrees blocks. The 5 degree comparison was used to demonstrate a method for the determination of equatorial gravity. (Author).
Author: Ohio State University. Department of Geodetic Science
Publisher:
ISBN:
Category : Geodesy
Languages : en
Pages : 88
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Author: William M. Kaula
Publisher:
ISBN:
Category : Earth (Planet)
Languages : en
Pages : 68
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A world-wide estimate of the gravity field, based on all available gravimetry and extended by Markov analysis using correlation with elevation, was combined with an estimate of the geoid based on astro-geodetic data covering 19% of the earth and with secular and long period variations of the 1957 Beta and 1958 Beta satellite orbits, into a generalization of least-squares adjustments taking correlation into account. The value obtained for the quadratic sum indicated that the estimates of variance and covariance should be increased about 44%. The results obtained include: Equatorial radius, 6378163 + or - 21 m; Flattening, 1/298.24 + or - 0.01; Equatorial gravity, 978043.6 + or - 1.2 milligals (Potsdam system); Datum shifts (with three-dimensional standard deviation) for the Americas system, + or - 35 m; Europe-Africa-Siberia-India system, + or - 38 m; Japan-Korea-Manchuria system, + or - 68 m; Coefficients in the spherical harmonic expression of the gravity field up to the 8th degree; and World-wide geoid heights, with standard deviations varying from + or - 10 m to + or - 22 m. (Author).
Author: Robert P. Bessette
Publisher:
ISBN:
Category : Altitudes
Languages : en
Pages : 28
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Book Description
We previously described (14,14) spherical-harmonic global adjustments of satellite altimetry using the AFGL short-arc technique supplemented with point masses to allow incorporation of short-wavelength geoidal detail. Recently, we have also investigated another technique to enhance short-wavelength detail: least squares collocation with noise. Both methods provide a means to determine a high resolution gravity field on a local, regional or global scale. Statistical comparisons of these two methods have been made in selected areas and the results tabulated.
Author: Petr Vanicek
Publisher: CRC Press
ISBN: 1000141438
Category : Science
Languages : en
Pages : 424
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Book Description
Geoid and its Geophysical Interpretations explains how an accurate geoid can be constructed and used for a variety of applied and theoretical geophysical purposes. The book discusses existing techniques for geoid computation, recently developed mathematical and computational tools designed for applications, and various interpretations. Principles and results are well illustrated. This book will be an excellent reference for geodesists, geophysicists, geophysical prospectors, oceanographers, and researchers and students in geophysics and geodesy.
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 628
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 268
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Author:
Publisher:
ISBN:
Category : Geophysics
Languages : en
Pages : 566
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Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geophysics
Languages : en
Pages : 872
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