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  • 1
    Publication Date: 2016-06-07
    Description: National Geodetic Survey activities towards the development of operational geodetic survey systems based on radio interferometry are reviewed. Information about the field procedures, data reduction and analysis, and the results obtained to date is presented.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center Radio Interferometry; p 9-22
    Format: application/pdf
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  • 2
    Publication Date: 2013-08-31
    Description: Development of gravimetric geoid for US from satellite derived gravity data and local gravimetric measurements
    Keywords: GEOPHYSICS
    Type: X-552-71-219 , NASA-TM-X-65691
    Format: application/pdf
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  • 3
    Publication Date: 2013-08-31
    Description: A series of lunar gravity analyses were carried out using unified S-band tracking network data obtained from Apollos 8, 10, 11, 12, 14, and 15. The progress obtained to date is summarized as it relates to the estimation of lunar mass distributions and their geologic interpretation. The analyses reported are of two distinct types. The first type consists of data obtained at two ranges of altitude to estimate the total mass associated with various lunar features employing a point mass assumption. The second type consists of detailed analyses of Apollo 14 tracking data.
    Keywords: SPACE SCIENCES
    Type: NASA-TM-X-65940 , X-553-72-148
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  • 4
    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; April 15-17, 1971; Washington, DC
    Format: text
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  • 5
    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 , 16-18 Aug. 1972; Saint Louis, MS; U.S
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  • 6
    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; 6-9 Sep. 1971; San Francisco
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  • 7
    Publication Date: 2019-07-13
    Description: A comparison is presented of sets of satellite tracking station coordinate values published in the past few years by a number of investigators, i.e. Goddard Space Flight Center, Smithsonian Astrophysical Observatory, Ohio State University, The Naval Weapons Laboratory, Air Force Cambridge Research Laboratories, and Wallops Island. The comparisons have been made in terms of latitude, longitude and height. The results of the various solutions have been compared directly and also with external standards such as local survey data and gravimetrically derived geoid heights. After taking into account systematic rotations, latitude and longitude agreement on a global basis is generally 15 meters or better, on the North American Datum agreement is generally better than 10 meters. Allowing for scale differences (of the order of 2 ppm) radial agreement is generally of the order of 10 meters.
    Keywords: NAVIGATION
    Type: NASA-TM-X-65814 , X-553-71-257 , Fall Meeting of the Am. Geophys. Union; Dec. 1970
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  • 8
    Publication Date: 2019-07-13
    Description: Resonant satellites requirements for gravimetric satellite geodesy, discussing earth gravitational field spherical harmonic extension and tesseral harmonics from satellite perturbations
    Keywords: SPACE SCIENCES
    Type: NATIONAL SPECIALIST SYMPOSIUM ON ORBITAL RESONANCE; JAN. 15-16, 1968; REDONDO BEACH, CA; US
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