Height System Unification with GOCE
|Projektname||Height System Unification with GOCE|
|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-
|Laufzeit||05.01.2011 - 04.30.2013|
|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
- To collect information and review the state-of-the-art in height systems and local/regional/global initiatives to unify height systems.
- 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.
- To review, evaluate and improve methodology and/or existing algorithms for height determination and height system unification.
- To attempt global height unification and tide gauge unification for those parts of the world where the data sets are available.
- 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).
- 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.
- 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.
- To involve local/national organizations maintaining height systems.
- 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.