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| Titel |
European Vertical Datum: Unification within Geopotential Space |
| VerfasserIn |
Nadim Dayoub, Philip Moore, Stuart Edwards, Nigel Penna |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250036679
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| Zusammenfassung |
| Various local vertical datums, as realised for particular countries or even regions, are in use
around the world. These datums were typically established from sea level observations at
single or multiple tide gauges. The fundamental geodetic parameter, W0, which represents
the geopotential value at the geoid surface, can be used to unify vertical datums
within geopotential space. This requires geodetic coordinates of points at mean sea
level (MSL), a high resolution geopotential model and an accurate mean dynamic
topography (MDT) model. In this study, the UK, German and French datums are
unified within geopotential space. The tide gauge time series and co-located GPS
provide the tools to connect mean sea level to the Earth’s centre of mass. A mean
dynamic topography model enables the reduction of MSL to the geoid surface.
Referencing the geodetic coordinates of the geoid to an Earth’s gravity field model
yields a geopotential value which corresponds to the geoid at the TG sites which can
then be used to connect the vertical datums in different regions. This study also
illustrates the improvement of EGM2008 compared with EGM96 and demonstrates the
influence of omission error on our work. Furthermore, to connect regional vertical
datums to a world height system, W0 is estimated globally from an altimetry-based
global MSL model, a global MDT and EGM2008. Our results show that, at current
accuracy of GPS and TG observations and processing strategies, unification of
vertical datums is mainly influenced by the accuracy of the geopotential model and
MDT.
Keywords: Geopotential, EGM2008, vertical datum, MDT |
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