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IAG History

Strengthening the role of geodesy: the new United Nations Subcommittee on Geodesy was inaugurated in Mexico City

"The new subcommittee is now established and this is an important step for improving global geodesy. We must work for the benefit of all member states," says Alexey Trifonov, who is the newly elected co-chair from the Russian Federation.
The inaugural meeting for the Subcommittee on Geodesy was convened on November 26th and 27th, and was hosted by INEGI in Mexico City in the margins of the 2017 UN-GGIM High Level Forum. 19 Member States and organisations participated in the meeting.
Australia's Gary Johnston is continuing as co-chair for the next year, while Norway's Laila Løvhøiden is stepping down. For more information, please click here!

UN Subcommittee on Geodesy established

August 4th the UN-GGIM seventh session in New York endorsed the terms of reference and formally established the first permanent UN-GGIM Subcommittee on Geodesy. For more information, please click here!

NASA, Norway to Develop Arctic Laser-Ranging Station

NASA and the Norwegian Mapping Authority are partnering to develop a state-of-the-art satellite laser ranging station 650 miles from the North Pole that will produce high-precision locations of orbiting satellites, help track changes in the ice sheets and improve the efficiency of marine transportation and agriculture. For more information, please click here!

Unified Analysis Workshop 2017

Unified Analysis Workshops are co-organized by the International Association of Geodesy’s (IAG’s) Global Geodetic Observing System (GGOS) and International Earth Rotation and Reference Systems Service (IERS). This was the 5th in a series of workshops that are held every two to three years for the purpose of discussing issues that are common to all the space-geodetic measurement techniques. For more information, please click here!

Inauguration of the Onsala Twin Telescopes

The Onsala Space Observatory, Chalmers University of Technology, and the International VLBI Service for Geodesy and Astrometry (IVS) are proud to announce the ceremonial inauguration of a new pair of Twin Telescopes for geodetic and astrometric VLBI. For more information, please click here!

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!

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!

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.

  • Consultant in Geodesy for UN programmes in Liberia
  • Strengthening the role of geodesy: the new United Nations Subcommittee on Geodesy was inaugurated in Mexico City
  • IAG Workshop SGCS2017: Participants urge closer collaboration between geodesists and climate scientists

  • Current date: February 22, 2018

    2018-02-26- 2018-03-02
    Young Astronomer School on the Scientific Exploitation of the Gaia Data

    2018-03-12- 2018-03-14
    Science with Precision Astrometry
    Baltimore, MD, USA

    2018-04-08- 2018-04-13
    EGU General Assembly 2018

    2018-05-30- 2018-06-01
    EUREF 2018 Symposium

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