Fitting gravimetric geoid models to vertical deflections
نویسندگان
چکیده
منابع مشابه
A Gravimetric Geoid Model as a Vertical Datum in Canada
The need for a new vertical datum in Canada dates back to 1976 when a study group at the Geodetic Survey Division (GSD) of Natural Resources Canada investigated problems related to the existing vertical reference system (CGVD28) and recommended a redefinition of the vertical datum. The US National Geodetic Survey and GSD cooperated in the development of a new North American Vertical Datum (NAVD...
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New Zealand, unlike most countries, does not have a single national vertical datum. Instead, twelve separate and poorly linked primary levelling networks tied to twelve different tide gauges are used. The current vertical datums are based on the false assumption that mean sea level, measured at the twelve tide gauges, corresponds to the same equipotential surface. Due to the effects of long-per...
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Gravimetric geoid computation is often based on modified Stokes’s integration, where Stokes’s integral is evaluated with some stochastic or deterministic kernel modification. Accurate numerical evaluation of Stokes’s integral requires the modified kernel to be integrated across the area of each discretised grid cell (mean kernel). Evaluating the modified kernel at the centre of the cell (point ...
متن کاملThe Use and Abuse of Vertical Deflections
This paper reviews the deflection of the vertical and its use and abuse in geodetic surveying. ‘Importantly, the deflection of the vertical in Australia will change by around 6” upon the implementation of the Geocentric Datum of Australia (GDA94). Therefore, for some applications, the deflection of the vertical may no longer simply be neglected in survey computations and adjustments. With the r...
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ژورنال
عنوان ژورنال: Journal of Geodesy
سال: 2008
ISSN: 0949-7714,1432-1394
DOI: 10.1007/s00190-008-0263-4