Please complete the protocol for Session 1 "Status of the ITGRF and national reports".
Date
National Reports
Japan, Takuma Koyanagi — Current Status of the Gravity Network in Japan
- NMI did not participate in ICAG-2023; [wording unclear]
- Comparisons between different institutions are organised every year
- Seasonal absolute gravity measurements at several sites
- 142 gravity stations collocated with GNSS
- Post-seismic gravity variations of up to 100 µGal
Latin America, Denizar Blitzkow — The Local Reference Gravity in Latin America
- Hundreds of A10 measurements in Brazil, Argentina, Ecuador, etc.
- Brazil: 75 stations
- Costa Rica: 18 stations
- Ecuador: 25 stations
- Paraguay: 14 stations
- Venezuela
- Uruguay
- Dominican Republic
- Gravity gradients measured by CG5 using a standard tripod
Indonesia, B. Triarahmadhana — Development of Absolute Gravimetry in Indonesia
- Geodetic control networks
- A10 surveys since 2017
- 65 absolute benchmarks; gravity gradients and 36-hour GNSS measurements
- Gravity measurements at geothermal fields
- Collaboration in gravity field research
- Online service
- FG5 measurements by Japan at two locations
China, Shuqing Wu and Jinyang Feng — Chinese Gravity Sites and the Comparison Site of NIM China
- Gravity base network: 200 stations, including 21 absolute gravity stations
- Crustal movement network: 100 absolute gravity stations
- Development of laser gravimeters, compact atom gravimeters and gradiometers
- APMP comparison planned for 2027
- Two CMCs published: measurement of g and calibration of absolute gravimeters
Finland, Mirjam Bilker-Koivula (online) — Report on the Finnish Absolute Gravity Network and Ongoing Related Projects
- 20 absolute gravity stations collocated with GNSS, with repeated g measurements every three years
- First-order network established in 2009–2011 using an A10 connected to six stations
- Project: Satellite and Terrestrial Gravity Fusion for Enhanced …
Sweden, A. Engfeldt — RG2000: The Swedish Gravity Reference Frame
- RG2000: 18 stations measured by FG5; 95 stations measured by A10
- 229 relative gravity stations in classes A, B and C
- 2025: FG5X data, new gravity gradients and new relative measurements
Spain, Félix Manuel Chaves Ruiz — Status of the Spanish Absolute Gravity Network (REGA)
- IGN — REGA, 2002–2020
- Order 0: 12 stations measured by FG5
- Order 1: 64 stations
Czech Republic, Martin Lederer and Vojtech Pálinkáš — National Report: Czech Republic
- 450 stations in total, including 20 absolute gravity stations
- Seasonal gravity variations determined at absolute gravity stations
- Gravity gradients determined using CG5 and Burris, with agreement at the 1 µGal/m level
Poland, Przemysław Dykowski — Poland, Borowa Góra Gravity Reference Function and Associated Gravimetry Activities in Europe
- Combination of AQG, i-Grav and FG5 at the Borowa Góra station
- Measurements carried out within the EQUIP-G project
Germany, T. Döhne, E. D. Antokoletz, J. Müller and H. Wziontek — Status of the German Gravity Reference and Networks
- DSGN2016
- Repeated measurements with variations of ±5 µGal
- 2006–2008: A10 measurements at 94 stations
- Height network
- 750 A10 measurements
- AQG used for field measurements; 4 µGal bias observed
USA, J. Kennedy — Station Report of the USGS
- USGS Southwest Gravity Program
- 200 stations, repeated 2–3 times per year
- Repeated GPS measurements
- Software for checking g data
- SGP software for network adjustment
USA, D. van Westrum — Status of TMGO, Colorado, USA
- TMGO: 9 piers
- Reference function based on repeated absolute gravity measurements (every two weeks) and continuous gPhone measurements
Italy, F. Grecco and A. Germak — Current Status of the Gravity Network in Italy
- G0 and H0 networks with 30 absolute gravity stations and external points
- IMGC-02, FG5-238 and FG5-218 compared repeatedly
- Fiducial network of 10 stations monitored continuously using i-Grav, FG5 or AQG
Hungary, Marta Kis (online) — Status of the Hungarian Gravimetric Base Network (HGN) and Its Participation in EQUIP-G
- 460 base points in three orders
- The network serves as a national standard
- More than 25 absolute gravity stations repeatedly measured at 8-year intervals; the Mátyáshegy reference station is measured more frequently
- Gravity decrease of approximately 30 µGal over 8 years detected at several stations in southern Hungary
P. Dykowski, S. Merlet, D. Carbone, L. Seoane, M. Reich and J. Lautier-Gaud for the EQUIP-G consortium — EQUIP-G Project: Current Status
V. Pálinkáš, H. Wziontek and Ch. Rothleitner — ERIgMEA Project Overview