Results 1 to 10 of about 782 (162)

A detailed quasigeoid model of the Hong Kong territories computed by applying a finite-element method of solving the oblique derivative boundary-value problem

Journal of Geodetic Science, 2023
New gravity and precise levelling measurements have been performed throughout the Hong Kong territories to modernize a vertical geodetic datum that is currently realized by heights of levelling benchmarks defined in the Hong Kong Principal Datum (HKPD ...
Čunderlík Robert, Tenzer Robert, Macák Marek, Zahorec Pavol, Papčo Juraj, Nsiah Ababio Albertini   +5 more
doaj   +2 more sources

On the connection of the Ecuadorian Vertical Datum to the IHRS [PDF]

Journal of Geodetic Science, 2023
In this work, the determination of the discrepancy between the Ecuadorian Vertical Datum (EVD) and the International Height Reference System (IHRS) is presented.
Carrión José L., de Freitas Sílvio R. Correia, Barzaghi Riccardo   +2 more
doaj   +2 more sources

Estimation of vertical datum offset for the South African vertical datum, in relation to the international height reference system [PDF]

Geodetski Vestnik, 2021
The vertical offset and the geopotential value over South Africa is estimated on the four fundamental benchmarks in relation to the international height reference system (IHRS).
Matthews Siphiwe Mphuthi, Patroba Achola Odera   +1 more
doaj   +1 more source

Analysis of a Relative Offset between the North American and the Global Vertical Datum in Gravity Potential Space

Remote Sensing, 2023
The accurate estimation of the zero-height geopotential level in a local vertical datum (LVD) is critical for linking traditional height reference systems to a global height system.
Dongmei Guo, Zhixin Xue
doaj   +1 more source

Estimation of Geopotential Value W₀ for the Geoid and Local Vertical Datum Parameters

Remote Sensing, 2023
Unification of the global vertical datum has been a key problem to be solved for geodesy over a long period, and the main challenge for unifying the global vertical datum system is to determine the geopotential value W0 of the geoid and to calculate the ...
Xinyu Liu, Shanshan Li, Jiajia Yuan, Diao Fan, Xuli Tan   +4 more
doaj   +1 more source

Estimation of Vertical Datum Parameters Using the GBVP Approach Based on the Combined Global Geopotential Models

Remote Sensing, 2020
Unification of the global vertical datum has been a key problem to be solved for geodesy over a long period, and the main challenge for a unified vertical datum system is to determine the vertical offset between the local vertical datum and the global ...
Panpan Zhang, Lifeng Bao, Dongmei Guo, Lin Wu, Qianqian Li, Hui Liu, Zhixin Xue, Zhicai Li   +7 more
doaj   +1 more source

Global Geopotential Models assessment in Ecuador based on geoid heights and geopotential values

Journal of Geodetic Science, 2023
Since the 1960s, the analysis of disturbed satellite orbits to infer Earth’s gravity field functionals has been an important element in determining the Earth’s gravitational field. The long wavelengths of the gravitational field are recovered through the
Carrión José, Flores Fredy, Rodríguez Freddy, Pozo Miguel   +3 more
doaj   +1 more source

The sand grain and the butterfly. Instability in geodesy and geophysics

Annals of Geophysics, 1997
The problems of convergence of series in celestial mechanics and of certain series in geodesy (Molodensky's series and spherical harmonics) show similar features, involving a curious instability. This is imaginatively expressed as the « butterfly effect»
H. Moritz
doaj   +1 more source

Approximations of the GOCE error variance-covariance matrix for least-squares estimation of height datum offsets

Journal of Geodetic Science, 2012
One main geodetic objective of the European Space Agency’s satellite mission GOCE (gravity field and steady-state ocean circulation explorer) is the contribution to global height system unification.
Gerlach Ch., Fecher Th.
doaj   +1 more source

Analytical formulation of topographic effects in the second geodetic boundary value problem

Journal of Geodetic Science
The second geodetic boundary value problem plays an important role in physical geodesy, as complex mountainous terrain significantly affects its solution, making accurate computation of topographic effects essential for generating a high-precision geoid.
Duan Hurong, Cao Wenxin, Xing Lelin, Jia Hualin   +3 more
doaj   +1 more source