EUVN_DA: Realization of the European Continental GPS/leveling Network
EUREF, the Sub-commission for the Euro-pean Reference Frame within IAG Commission 1, in cooperation with the European Geoid and Gravity Project (EGGP), is developing a homogeneous continental GPS/leveling database. EUVN_DA, the Densification Action of the
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EUVN_DA: Realization of the European Continental GPS/leveling Network A. Kenyeres, M. Sacher, J. Ihde, H. Denker, and U. Marti
Abstract EUREF, the Sub-commission for the European Reference Frame within IAG Commission 1, in cooperation with the European Geoid and Gravity Project (EGGP), is developing a homogeneous continental GPS/leveling database. EUVN_DA, the Densification Action of the EUVN (European Unified Vertical Reference Network) project is designed to support the development of the new European geoid solutions and to contribute to the realization of an accurate continental height reference surface. The cmaccuracy GPS/leveling database could also be used for the realization of the European Vertical Reference System (EVRS) and for the analysis of the national height networks. The establishment of the EUVN_DA network was started in 2003. The database now consists of about 1,500 high quality GPS/leveling points contributed from 25 countries. The GPS coordinates refer to the realizations of the ETRS89 and the leveling data to EVRS2007. Most of the EUVN_DA benchmarks are integrated into the UELN (United European Leveling Network) to assure the long term homogeneity and consistency of the height information. The GPS database mostly relies on existing measurements which fulfilled pre-defined quality requirements. The main phase of the project terminates by the end of 2008, but the periodic maintenance of the database is planned on long term. This paper summarizes the activities within the EUVN_DA project, gives an overview on the actual
A. Kenyeres () FÖMI Satellite Geodetic Observatory, Budapest H-1592, Hungary e-mail: [email protected]
status and presents the results on the analysis of the continental geoid solutions.
41.1 Introduction The large scale GPS/leveling networks may have multiple functions in geodesy, as they may be used for height datum definition, serve as control points for continental geoid solutions and global geopotential models and may be used for the creation of height reference surfaces in the application of GPS heighting. The skeleton of such a network in Europe was the EUVN, established in 1997, and involves 196 points covering the continent and the larger islands. The network incorporated selected leveling nodal points (54), permanent EUREF (66) and national (13) GPS stations and tide gauges (63). Details about EUVN can be found in Ihde et al. (2000). The EUVN points were associated with high quality cm-accuracy 3D coordinates in ETRS89 (ETRF96 epoch 1997.4) and geopotential numbers related to EVRS2000 zero level, which were used to derive normal heights. However the joint analysis was difficult, because the network was relatively sparse and the continental geoid available, EGG97 (Denker and Torge, 1997) had quality problems with both the gravity data and geopotential models. In order to distinguish, identify and/or eliminate the data inconsistencies, and to improve the separation of the various error components a more accurate continental geoid solution and a denser GPS/leveling ne
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