Towards an integrated global geodetic reference frame: preface to the special issue on reference systems in physical geodesy

Sánchez, Laura; Wziontek, Hartmut; Wang, Yan Ming; Vergos, George; Timmen, Ludger

doi:10.1007/s00190-023-01758-6

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Towards an integrated global geodetic reference frame: preface to the special issue on reference systems in physical geodesy

2023
By Sánchez, Laura ; Wziontek, Hartmut ; Wang, Yan Ming ; ...
Source: Journal of Geodesy, 97(6)

[PDF-220.05 KB]

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Journal Title:

Journal of Geodesy
Personal Author:

Sánchez, Laura ; Wziontek, Hartmut ; Wang, Yan Ming ; Vergos, George ; Timmen, Ludger

Sánchez, Laura ; Wziontek, Hartmut ; Wang, Yan Ming ; Vergos, George ; Timmen, Ludger Less -
NOAA Program & Office:

NOS (National Ocean Service) ; NGS (Office of National Geodetic Survey)

NOS (National Ocean Service) ; NGS (Office of National Geodetic Survey) Less -
Description:

Already in 1878 Bruns noted in his famous work Die Figur der Erde (Bruns 1878) that an ellipsoid of revolution would most likely not be sufficient to characterise the figure of the Earth. At that time, he referred to the results of arc measurements, while today, technology has advanced enormously and space geodesy allows positioning and determination of the sea surface below the cm-level almost globally and to describe the Earth's surface in very detail. However, important physical properties, i.e. related to the question in what direction the water flows, are incomplete without considering the Earth's gravity field. Heights with a physical meaning refer to equipotential surfaces of the Earth gravity potential, which cannot be measured directly. Future optical clock comparisons may enable the determination of geopotential differences with superior accuracy, but these point measurements will need to be densified and linked to a global height reference. Therefore, the geopotential has still to be inferred from its gradient, the acceleration of gravity, or even its second derivative, or from satellite orbit perturbations. Although satellite gravity field missions like GOCE and GRACE have marked a breakthrough in the determination of the geopotential field and its temporal changes, only terrestrial gravity observations enable for inferring highest spatial and temporal resolution. State-of-the-art absolute gravimeters provide an uncertainty of a few parts per billions and by this, they are sensitive to mass redistributions and vertical displacements.
Keywords:

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Computers In Earth Sciences Geochemistry And Petrology Geophysics
Source:

Journal of Geodesy, 97(6)
DOI:

https://doi.org/10.1007/s00190-023-01758-6
ISSN:

0949-7714;1432-1394;
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PDF
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Springer Science and Business Media LLC
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Journal Article
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https://creativecommons.org/licenses/by/4.0
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CC BY
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urn:sha256:3b083c0672c3100225c9be2504794249b5d65bf2747fab703ef42ce517da775c
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https://repository.library.noaa.gov/view/noaa/54558/noaa_54558_DS1.pdf
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Towards an integrated global geodetic reference frame: preface to the special issue on reference systems in physical geodesy

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