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

  • See presentation

V. Pálinkáš, H. Wziontek and Ch. Rothleitner — ERIgMEA Project Overview

  • See presentation
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