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Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 Fennoscandian Uplift Observed with Absolute Gravity Measurements.

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Presentation on theme: "Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 Fennoscandian Uplift Observed with Absolute Gravity Measurements."— Presentation transcript:

1 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 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

2 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 Project with participation of: NGS / NOAA (USA) BKG (Germany) NMA / Statens Kartverk (Norway) FGI (Finland) Lantmäteriet (Sweden) Absolute Gravity Determination in the Scandinavian Land-Uplift Zone

3 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 Absolute gravity measurements in Martsbo/Sweden Martsbo (Sweden) -1,29 µGal / year ± 0,3 µGal / year

4 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 Observed Mean Gravity Rates

5 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 GPS at Martsbo GPS-time serie EPN (EUREF Permanent Network)

6 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 Outline Compilation of gravity changes and GPS uplift rates

7 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 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

8 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 European Combined Geodetic Network ECGN - Status Report - Website of ECGN Project ECGN Website Guidelines and Forms with links to guidelines and forms for the different observation techniques Johannes Ihde, Trevor Baker, Carine Bruyninx, Olivier Francis, Martine Amalvict, Ambrus Kenyeres, Jaakko Makinen, Steve Shipman, Jaroslav Simek, Herbert Wilmes

9 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 European Combined Geodetic Network ECGN - Status Report - Maintenance of long time stability of the terrestrial reference system with an accuracy 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 Integrated European Reference System for Spatial Reference and Gravity

10 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 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.

11 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 European Combined Geodetic Network ECGN - Status Report - ECGN status 1 st call proposals 20 countries 72 stations with  GPS (EPN)  absolut gravity  levelling to EVRS  6 super conducting gravimeters  15 tide gauges

12 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 European Combined Geodetic Network ECGN - Status Report - 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) Present Status, ECGN Meta Data Base

13 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 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 Methodology and Analysis (2 nd Call postponed)

14 Nordic Geodetic Commision, WG for Geodynamics, Annual Meeting 2005, Masala /Finland, May 3-4 Construction of an integrated geodetic network in Germany -permanent GPS -Levelling -Absolute gravity measurements and SCG stations


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