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  • GEOPHYSICS  (4)
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  • 1
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    A detailed gravimetric geoid for the United States (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Development of gravimetric geoid for US from satellite derived gravity data and local gravimetric measurements
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-65691 , X-552-71-219
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Detailed gravimetric geoid for the United States. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A detailed gravimetric geoid was computed for the United States using a combination of satellite-derived spherical harmonic coefficients and 1 by 1 deg mean gravity values from surface gravimetry. Comparisons of this geoid with astrogeodetic geoid data indicate that a precision of plus or minus 2 meters has been obtained. Translations only were used to convert the NAD astrogeodetic geoid heights to geocentric astrogeodetic heights. On the basis of the agreement between the geocentric astrogeodetic geoid heights and the gravimetric geoid heights, no evidence is found for rotation in the North American datum. The value of the zero-order undulation can vary by 10 to 20 meters, depending on which investigator's station positions are used to establish it.
    Keywords: GEOPHYSICS
    Type: International Symposium on The use of artificial satellites for geodesy; Apr 15, 1971 - Apr 17, 1971; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    A detailed gravimetric geoid from North America to Eurasia (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A detailed gravimetric geoid of the United States, North Atlantic, and Eurasia, which was computed from a combination of satellite derived and surface gravity data, is presented. The precision of this detailed geoid is + or - 2 to + or - 3 m in the continents but may be in the range of 5 to 7 m in those areas where data is sparse. Comparisons of the detailed gravimetric geoid with results of Rapp, Fischer, and Rice for the United States, Bomford in Europe, and Heiskanen and Fischer in India are presented. Comparisons are also presented with geoid heights from satellite solutions for geocentric station coordinates in North America, the Caribbean, and Europe.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-65884 , X-553-72-94 , Natl. Fall. Meeting of Am. Geophys. Union; Sep 06, 1971 - Sep 09, 1971; San Francisco
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    A detailed gravimetric geoid of North America, Eurasia, and Australia (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A detailed gravimetric geoid of North America, the North Atlantic, Eurasia, and Australia computed from a combination of satellite-derived and surface 1 x 1 gravity data, is presented. Using a consistent set of parameters, this geoid is referenced to an absolute datum. The precision of this detailed geoid is + or - 2 meters in the continents but may be in the range of 5 to 7 meters in those areas where data was sparse. Comparisons of the detailed gravimetric geoid with results of Rice for the United States, Bomford and Fischer in Eurasia, and Mather in Australia are presented. Comparisons are also presented with geoid heights from satellite solutions for geocentric station coordinates in North America, the Caribbean, Europe, and Australia.
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-66238 , X-553-72-331 , Aug 16, 1972 - Aug 18, 1972; Saint Louis, MS; U.S
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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