The EUROPEAN COMBINED GEODETIC NETWORK (ECGN) integrates the spatial and height reference system into the Earth gravity field parameter estimation. In order to ensure the long-time stability of the terrestrial reference system with an accuracy of 10 -9 in the global and continental scale, the interaction between different time dependent influences of the system Earth to the terrestrial reference system and the related observation has to be considered in the evaluation models. Local data centers for absolute gravity data and super conducting gravimeter data should be installed in the first stage by the ECGN working group. ECGN levelling data will be collected at the UELN/EVRS data center. For super conducting gravimeter data, the GGP (Global Geodynamic Project) data centre could be used for data collection. In the first step, the main action of the ECGN working group will be a pilot study of the combination of the different observations from the available stations, and this to get experiences in the combination of spatial information with gravity field related data. In parallel to the first call, the ECGN working group will prepare the second call for the analysis and investigations. The GNSS part of the observations gathered at the ECGN stations will be an integral part of the EPN (EUREF Permanent Network) and as such will have to fulfill the EPN guidelines. Standard for the ECGN stations is a local network for the derivation of eccentricities at a 1 mm accuracy level in all three spatial components. The ECGN stations have the standard observation techniques GNSS (GPS/GLONASS, GALILEO), gravity (super conducting gravimeter and/or absolute gravimeter), levelling connections to nodal points of UELN/EVRS, meteorological parameters. The first call is directed to the implementation of the ECGN stations following the concept of the project. The call for participation is, from the point of view of time, structured in two stages.
#Tide graph 39553 series#
The ECGN is a European network for the integration of time series of spatial/geometric observations (GNSS – GPS/ GLONASS and in the future GALILEO), gravity field related observations and parameters (gravity, tides, ocean tides), and supplementary information (meteorological parameters, surrounding information of the stations e.g. In order to ensure the long-time stability of the terrestrial reference system with an accuracy of 10 -9 at both the European and global scale, the interaction between the different time dependent influences of the system Earth on the terrestrial reference system and the related observations has to be considered in the evaluation models. In the tide-gauge stations, the connection to the sea level is realized. In addition the corresponding normal heights as well as the gravity values are provided. The EUVN is a static integrated network, at all EUVN points three-dimensional coordinates and geopotential numbers are derived. The work started with the UELN project and one year later continued with the realization of the European Vertical Reference Network (EUVN). In 1995, EUREF took over the task of the realization and maintenance of European vertical reference systems.
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