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IAG History

Description of the Global Geodetic Reference Frame

The United Nations General Assembly adopted the resolution on a Global Geodetic Reference Frame for Sustainable Development (A/RES/69/266) on February 26, 2015. The purpose of this document is a description of the Global Geodetic Reference Frame (GGRF), along with a brief description of its key components, as a realization of the Global Geodetic Reference System (GGRS).

This document forms the basis for a common understanding of the GGRF. It has been prepared by the International Association of Geodesy (IAG), the organization responsible for the science of geodesy. It thus outlines the IAG’s perspective of what the GGRF is, and how it is realized through the contributions of the IAG components. For more information, please click here!

IAG/CPGPS International Conference on GNSS+ (ICG+ 2016)

The IAG/CPGPS International Conference on GNSS+ (ICG+2016) was held at the Shanghai Astronomical Observatory, CAS, July 27-30, 2016, Shanghai, China. The recent advances, opportunities and challenges on GNSS were presented and discussed, including GNSS constellations, signals, orbit, receiver, positioning/navigation/timing theory, algorithms, models and applications in engineering and Earth science as well as using combined multi-sensors. For more information, please click here!

Milestone for global geodesy

The UN calls for enhanced cooperation on global geodesy. At the UN-GGIM sixth session in New York in August, the UN Committee of Experts on Global Geospatial Information Management endorsed the GGRF Roadmap and decided to establish a permanent Sub-Committee on Geodesy. Photo: Anne Jørgensen For more information, please click here!

Commission 2 - Gravity Field

The accurate determination of the gravity field and its temporal variations is one of the three fundamental pillars of modern geodesy (besides of geometry/kinematics and Earth rotation). This is essential for applications in positioning and navigation, civil engineering, metrology, but also for many geoscientific disciplines, because the Earth’s gravity field reflects the mass distribution and its transport in the Earth’s interior and on its surface. For more information, please click here!

IVS School on Very Long Baseline Interferometry

The IVS organized its 2nd training school at the Hartebeesthoek Radio Astronomy Observatory (HartRAO), South Africa, 9‒12 March 2016. The purpose of the training school was to help prepare the next generation of researchers to understand VLBI systems and inspire them in their future careers. The 45 participants included 32 students from institutions in different countries in Africa and Asia, Europe, and North America as well as 13 professionals (including postdocs) from the VLBI community and other fields of space geodesy. For more information, please click here!

The ITRF 2014 has been published

The new version of the International Terrestrial Reference Frame (ITRF) was released in January 21, 2016, and is available at the dedicated website: http://itrf.ign.fr/ITRF_solutions/2014/. For more information, please click here!

Milestone reached on Svalbard

The Norwegian Mapping Authority’s new geodetic Earth observatory at Ny Ålesund in the Svalbard islands is taking shape, with the first stage completed just over a year after construction began.

This means that the new instrument building is now ready to receive the antennas which will be used to measure the planet’s motions and changes. For more information, please click here!

A roadmap for the enhancement of geodesy

The United Nations Global Geospatial Information Management (UN-GGIM) Working Group on the Global Geodetic Reference Frame (GGRF) is now drafting a roadmap for the enhancement of the Global Geodetic Reference Frame. Importantly the roadmap will also address factors affecting the Sustainability of the GGRF. For more information, please click here!

UN General Assembly urges sharing of geospatial data to benefit people and planet

The science that supports the precise pinpointing of people and places should be shared more widely, according to the United Nations General Assembly as it adopted its first resolution recognizing the importance of a globally-coordinated approach to geodesy – the discipline focused on accurately measuring the shape, rotation and gravitational field of planet Earth. For more information, please click here!

Welcome to the International Association of Geodesy

The International Association of Geodesy (IAG) is a scientific organization in the field of geodesy. It promotes scientific cooperation and research in geodesy on a global scale and contributes to it through its various research bodies. It is an active member of the International Association of Geodesy and Geophysics (IUGG) which itself is a member of the International Council for Science (ICSU).
The IAG has a long and distinguished history that goes back to 1862, the year, in which the "Mitteleuropäische Gradmessung" was established. This organization was formed to promote scientific work in geodesy in Central Europe, following a proposal made a year earlier by J.J. Baeyer (1861). In 1867, the name of the organization was changed to "Europäische Gradmessung", because by then countries from all of Europe had joined the organization. In 1886, the name was changed to "Internationale Erdmessung", emphasizing the need for international cooperation to solve the scientific tasks of geodesy. The French and English translations of this name resulted in the current name "International Association of Geodesy (IAG)". Thus, the IAG as an international scientific organization goes back to 1886 and is one of the oldest international organizations of this kind.


The Mission of the Association is the advancement ofgeodesy. The IAG implements its mission byfurthering geodetic theory through research andteaching, by collecting, analyzing, modelling andinterpreting observational data, by stimulating technological development and by providing a consistent representation of the figure, rotation, and gravity field ofthe Earth and planets, and their temporal variations.

  • ILRS: Special Issue of the Journal of Geodesy on laser ranging - Call for papers.
  • IGFS updated website and services representation
  • International Digital Elevation Model Service (IDEMS)

  • Current date: April 30, 2017

    2017-05-15- 2017-05-19
    23rd Working Meeting of the European VLBI Group for Geodesy and Astrometry (EVGA)


    EUREF 2017 Tutorial
    Wroclaw, Poland

    2017-05-17- 2017-05-19
    EUREF 2017 Symposium
    Wroclaw, Poland

    2017-05-29- 2017-06-02
    FIG Working Week 2017

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