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Technische Universität München

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Institut für Astronomische und Physikalische Geodäsie

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Height System Unification with GOCE


Projektname Height System Unification with GOCE
Akronym HSU
Kurzbeschreibung A primary mission objective of GOCE is the determination of the geoid heights with an accuracy of 1-2cm with a spatial resolution of about 100 km. More than 100 height systems exist worldwide. GOCE offers the possibility of a global unification of height systems. All related aspects are subject of this study.
Zuordnung zu CGE-
Fachbereichen		 FB 2
Laufzeit 05.01.2011 - 04.30.2013
Projektgeber /
Programm		 European Space Agency (ESA)
Kontaktperson(en) Dr.-Ing. Thomas Gruber, Univ.-Prof. Dr.-Ing. Dr. h.c. mult. Reiner Rummel
Projektmitarbeiter Dr.-Ing. Thomas Gruber, Univ.-Prof. Dr.-Ing. Dr. h.c. mult. Reiner Rummel, Dr.-Ing. Christian Gerlach
Externe Partner J Ihde, G Liebsch, BKG Frankfurt
M Sideris, E Rangelova, University of Calgary
Ph Woodworth, Ch Hughes, NOC Liverpool
There are nine objectives to be addressed in this study:
  1. To collect information and review the state-of-the-art in height systems and local/regional/global initiatives to unify height systems.
  2. To quantify the currently known differences (without a precise GOCE geoid) between height systems in Europe and other parts of the world based on available literature and existing results.
  3. To review, evaluate and improve methodology and/or existing algorithms for height determination and height system unification.
  4. To attempt global height unification and tide gauge unification for those parts of the world where the data sets are available.
  5. To select two test regions for height system unification and to demonstrate the benefit of using GOCE data for this purpose (to the resolution and accuracy of the new data).
  6. To assess the impact of a unified height system on local gravity information (systematic errors in local gravity anomalies and alike) and topographic heights and vice versa.
  7. To geophysically interpret height differences (compared to the GOCE geoid) at one or more tide gauges in terms of ocean dynamic topography and currents and to compare the results to altimetry.
  8. To involve local/national organizations maintaining height systems.
  9. To provide a roadmap for future work required to define a world height system and vertical datum exploiting GOCE data.

Figure: Schematic overview of basic relations between ellipsoidal and physical heights
referring to different datum realizations.