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  • 1
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    Detailed 1 x 1 deg gravimetric Indian Ocean geoid and comparison with GEOS-3 radar altimeter geoid profiles (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A new set of 1 x 1 deg mean free-air anomalies in the Indian Ocean is determined on the basis of previously published free-air anomaly maps (Talwani and Kahle, 1975) and the most recent Lamont surface ship gravity measurements. The data are then used to compute a (total) 1 x 1 deg gravimetric Indian Ocean geoid. The computation is carried out by combining the Goddard Space Flight Center (GSFC) GEM-6 geoid and a difference geoid that corresponds to the differences between the set of 1 x 1 deg surface gravity values and the GEM-6 gravity anomalies. The difference geoid is highest over the Madagascar Ridge (+20 m) and lowest over the Timor Trough (-30 m). The total geoid is compared with GEOS-3 radar altimeter-derived geoid profiles, and geophysical implications are discussed.
    Keywords: GEOPHYSICS
    Type: Geophysical Journal; 55; Dec. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Analysis and geological interpretation of gravity data from GEOS-3 altimeter (1978)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A number of detailed gravimetric geoids of portions of the world's oceans from marine gravity measurements were constructed. The geoids were constructed by computing 1 x 1 deg or 10 x 10 deg averages of free-air anomaly data and subtracting these values from currently used satellite derived Earth models. The resulting difference gravity anomalies are then integrated over a sphere using a simplified form of Stoke's equation to obtain a difference geoid. This difference geoid is added to the satellite derived model to obtain a 1 x 1 deg or 10 x 10 deg total gravimetric geoid. The geoid undulations are studied by comparison of the altimeter measurements with the morphology of the ocean floor. Utilizing a combination of altimetry data, gravity and seismic reflection data, geophysical models of the earth can be constructed.
    Keywords: GEOPHYSICS
    Type: NASA-CR-156849
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Comparison of gravimetric geoids with GEOS 3 altimetric geoid (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The paper examines how well GEOS 3 radar altimeter estimates of geoid height compare with data from independently determined gravimetric geoids. To this end, GEOS 3 altimeter estimates of geoid height are compared with 1 by 1 deg gravimetric geoids in the North Atlantic, Northwest Pacific, and Indian oceans. There exist constant offsets and long-wavelength discrepancies between the two sets of data. Although some difficulties exist with constant offset and long-wavelength discrepancies, the GEOS 3 radar altimeter appears to detect geological features such as deep-sea trenches and is an excellent instrument for acquiring measurements of the shape of the ocean surface.
    Keywords: GEOPHYSICS
    Type: AD-A078760 , Journal of Geophysical Research; 84; July 30
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Gravimetrically determined geoid in the western North Atlantic (1972)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A detailed gravimetric geoid for the western North Atlantic is obtained by correlating satellite-borne gravity measurements with topographical sea surface data to construct maps of free air gravity.
    Keywords: GEOPHYSICS
    Type: NOAA Sea Surface Topography from Space, Vol. 2; 34 p
    Format: text
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    NASA TECHNICAL REPORTS
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