Abstract
AbstractA suitable representation of the regional gravity field is used to estimate relative offsets between national height system realizations in Europe. The method used is based on a gravimetric approach and benefits from the significant improvements in the determination of the global gravity field by the recent satellite gravity missions the Gravity Recovery and Climate Experiment (GRACE) and the Gravity field and steady-state Ocean Circulation Explorerr (GOCE). The potential of these missions for the unification of height reference frames is analyzed in terms of accuracy and spatial resolution. The results of the gravimetric approach are compared to the independent results of the geodetic leveling approach. Advantages and drawbacks of both methods are discussed.
Highlights
The uni cation of independent realizations of height systems has been discussed for a long time
In order to increase the spatial resolution of the derived gravity eld model, satellite-only global gravity eld models (GGM) based on Gravity eld and steady-state Ocean Circulation Explorerr (GOCE) observations are combined with the European Gravimetric Geoid/Quasigeoid 2008 (EGG2008) by a lter technique (Section 3)
The long wavelength part has been modeled with the EIGEN-GL04C, a global gravity eld model of the pre GOCE era computed from CHAMP, Gravity Recovery and Climate Experiment (GRACE) and terrestrial data
Summary
The uni cation of independent realizations of height systems (height reference frames) has been discussed for a long time (see e.g. Rummel 1988, Xu 1992, Rummel 2002, Ardalan 2005, Gatti 2012). In comparison to other geodetic observation methods, leveling networks show a low redundancy and are susceptible to systematic errors One example of such a leveling network is the European Vertical Reference Frame 2007 (EVRF2007, Sacher 2009). In contrast to the geodetic leveling approach an observed height difference between the height reference frames to be connected is not required. In order to increase the spatial resolution of the derived gravity eld model, satellite-only GGMs based on GOCE observations are combined with the European Gravimetric Geoid/Quasigeoid 2008 (EGG2008) by a lter technique (Section 3).
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