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- W2806375649 abstract "This paper concentrates on the empirical evaluation of the so-called Neumann geodetic boundary-value problem, also known as the fixed gravimetric boundary-value problem, to determine a reference geopotential value W0 as a basis for the global vertical datum unification. The boundary surface is assumed as the mean sea surface derived from satellite altimetry, and the boundary condition is given by the gravity disturbances obtained from a global gravity model in combination with a reference ellipsoid (here GRS80). In order to establish the reliability of the numerical computation, several global gravity models and mean sea surface models are applied. All of them lead to very similar W0 values, the discrepancies of which are less than ~ ± 0.05 m2s-2. The largest variation of W0 (~ 1.2 m2s-2) is caused by the reduction of the latitudinal coverage from the range of altimetry (~ ± 80∘) to the ice-free ocean limit (∼ ± 60∘). The W0 value obtained from this approach differs considerably from the theoretical potential U0 of the GRS80 ellipsoid and from the numerical standard included in the IERS conventions." @default.
- W2806375649 created "2018-06-13" @default.
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- W2806375649 date "2008-01-01" @default.
- W2806375649 modified "2023-09-27" @default.
- W2806375649 title "Approach for the establishment of a global vertical reference level" @default.
- W2806375649 hasPublicationYear "2008" @default.
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