Abstract
That the accuracy of computing the undulations in the geoid is not yet as high as is desired is not due to the method itself but to the lack of gravity data. The masses of the great formations are 85 to 90 per cent isostatically compensated. The flattening ratio value, 1/298.3, obtained by the satellite method has also been obtained several times by gravity and arc-measuring methods. At the Institute of Geodesy, Photogrammetry and Cartography we have been conservative; we have used only the gravimetric method and have not extrapolated gravity anomalies more than 15° from the computation point. Uotila obtained by spherical harmonic analysis third-order harmonics similar to those obtained by O'Keefe from satellite data. The undulations associated with the pear-shaped form are of the order of ±15 meters. O'Keefe's geoid heights at the north and south poles are brought about solely by the fact that the flattening value he used (1/299.8) does not correspond to the real facts.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
