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Fennoscandian Uplift Observed with Absolute Gravity Measurements in the Period 1991 to 2003 H. Wilmes 1), R. Falk 1), F. Klopping 2), E. Roland 3), A. Lothhammer 1), A. Reinhold 1), B. Richter 1), H.-P. Plag 3), J. Mäkinen 4) 1) Bundesamt für Kartographie und Geodäsie (BKG), Germany 2) National Oceanographic and Atmospheric Administration (NOAA), U.S.A. 3) Norwegian Mapping Authorities (NMA), Norway 4) Finnish Geodetic Institute (FGI), Finland
Absolute Gravity Determination in the Scandinavian Land-Uplift Zone 1991 - 2003 • Project with participation of: • NGS / NOAA (USA) • BKG (Germany) • NMA / Statens Kartverk (Norway) • FGI (Finland) • Lantmäteriet (Sweden)
Absolute gravity measurements in Martsbo/Sweden Martsbo(Sweden)-1,29 µGal / year ± 0,3 µGal / year
GPS at Martsbo GPS-time serieEPN (EUREF Permanent Network)
Outline Compilation of gravity changes and GPS uplift rates
Conclusions • More than 10 years of absolute gravity observations clearly reveal long term gravity changes related to post glacial uplift • Combination of data from different groups and instruments make instrumnet monitoring and comparison an importand precondition • Seasonal gravity variations are not accesible with present data and have been assigned for in the error estimation • The local gravity field at the stations need to be checked.(e.g. building activities in Trondheim cover the gravity signal) • More complete environmental data improve the description of seasonal gravity variations
European Combined Geodetic Network ECGN- Status Report - Johannes Ihde, Trevor Baker, Carine Bruyninx, Olivier Francis, Martine Amalvict, Ambrus Kenyeres, Jaakko Makinen, Steve Shipman, Jaroslav Simek, Herbert Wilmes Website of ECGN Project http://www.bkg.bund.de/ecgn ECGN Website Guidelines and Forms with links to guidelines and forms for the different observation techniques
European Combined Geodetic Network ECGN- Status Report - Integrated European Reference System for Spatial Reference and Gravity • Maintenance of long time stability of the terrestrial reference system with an accuracy 10-9 for Europe especially in the height component • In-situ combination of geometric positioning (GPS) with physical heights and other Earth gravity parameters in 1 cm-accuracy level • Modelling of influences of time depended parameters of the solid Earth of the Earth gravity field, the atmosphere, the oceans, the hydrosphere for different applications of positioning
European Combined Geodetic Network ECGN- Status Report - This call concerns the elaboration of the observation network of ECGN stations with the standard observation techniques: -GNSS (GPS/GLONASS, GALILEO) – permanent -Gravity (super conducting gravimeter – permanent and/or absolut gravimeter) or repeated -Levelling connections to UELN/EVRS – repeated -Tide gauges – permanent -Meteorological parameters – permanent.
European Combined Geodetic Network ECGN- Status Report - • ECGN status 1st call proposals • 20 countries • 72 stations with • GPS (EPN) • absolut gravity • levelling to EVRS • 6 super conducting gravimeters • 15 tide gauges
European Combined Geodetic Network ECGN- Status Report - Present Status, ECGN Meta Data Base Meta Data • in general the ECGN project based on existing data • only the information about the data i.e. meta data should be collect • therefore in the meta data form the availability of the data and the access to the data should be described • the local ties are also a part of the form • ECGN Meta Data Form (see ECGN Website – PDF/TXT File)
Methodology and Analysis (2nd Call postponed) European Combined Geodetic Network ECGN- Status Report - The second ECGN call is still a matter of further discussions. It will include the status of the project (stations, data availability, meta database, data policy). In a second call it could be asked for: • Methodical investigations for the combination of spatial observation data with gravity field related data • AG/SG combination • AG/SG array for GOCE validation • Combination of space techniques (GPS/GLONASS, GALILEO, VLBI, SLR) • Single station analysis of different observation techniques • Analysis centers for the combination of time series of all ECGN stations • Establishment of co-operations to solve the above mentioned questions
Construction of an integrated geodetic network in Germany • permanent GPS • Levelling • Absolute gravity measurements and SCG stations