GGOS Days 2026

Important Note
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GGOS is the Global Geodetic Observing System of the International Association of Geodesy (IAG). Through GGOS, the IAG provides a common framework to encourage, coordinate and facilitate Earth-monitoring efforts based on geodesy. This framework aims to integrate observations collected by different national and international organisations and to raise awareness of geodesy and its products. GGOS relies on the existing geodetic observing infrastructure and the IAG organisational structure. The IAG Commissions, Inter-Commission Committees and Projects address key scientific issues to innovate methods and technologies in the various fields of geodesy, framing the science background for GGOS. The IAG Services facilitate the global coordination of activities to collect and analyse geodetic data and to provide geodetic reference frames and other products to geodesists, researchers of other Earth sciences, national administrations, and society in general. Additional operational elements dedicated solely to GGOS issues ensure the efficient organisation of GGOS activities and address challenges that cannot be solved by individual IAG components alone.

Each year, the GGOS Executive Committee organises the GGOS Days to update the IAG and GGOS communities on recent achievements and current challenges faced by the various colleagues involved in accomplishing the GGOS strategic goals. On this occasion, thanks to the kind invitation of Lantmäteriet, the Swedish Mapping, Cadastral and Land Registration Authority, the GGOS Days 2026 will be held as a hybrid meeting in Gävle, Sweden, from October 5 to 7, 2026.

In the week before the GGOS Days 2026, the TIGER Symposium of IAG Commission 3 (28  September to 1 October) and a GGOS Topical Meeting on Geohazards (2nd October) will also be held in Gävle. Participants of the GGOS Days 2026 are also welcome to attend the TIGER Symposium and the GGOS Topical Meeting on Geohazards.

Programme

The program for GGOS Days 2026 is still being finalized. Please check this page regularly for the latest updates. We look forward to welcoming you!

Monday, October 5

Please arrive in good time before the start of the GGOS Days to collect your badge.

  • 09:15 – 09:30
    Welcome, logistics, safety
  • 09:30 – 09:45
    GGOS: the observing system of the International Association of Geodesy
    Laura Sánchez (DGFI-TUM, Germany)
    Onsite
  • 09:45 – 10:00
    News from the International Association of Geodesy
    Richard Gross (IAG, USA)
    Onsite
  • 10:00 – 10:15
    Strengthening the Chain: Securing the operational future of global geodesy
    Allison Craddock (UN-GGCE, Germany)
    Onsite
  • Coffee break is provided at the venue
  • Kindly sponsored by Lantmäteriet
  • 10:45 – 11:00
    Lantmäteriet and Geodetic infrastructure in Sweden – the new 10 yr strategy
    Martin Lidberg (Lantmäteriet, Sweden)
    Onsite
  • 11:00 – 11:15
    Strengthening Geodetic Infrastructure in Africa: Swedish Experiences
    Mikael Lilje (Lantmäteriet, Sweden)
    Onsite
  • 11:15 – 11:30
    EPOS-SE: The Swedish contribution to FAIR solid Earth sciences data in the European Plate Observing System (EPOS)
    Henning Lorenz (Uppsala University, Sweden)
    Onsite
  • 11:30 – 11:45
    On the development of BSCD2000, the new common chart datum for the Baltic Sea
    Jonas Ågren (Lantmäteriet, Sweden)
    Onsite
  • 11:45 – 12:00
    Running a geodetic fundamental station – status and plans for Onsala
    Ruediger Haas (Chalmers, Sweden)
    Onsite
  • 12:00 – 12:15
    The Nordic Geodetic Commission (NKG) – a successful cooperation between the Nordic and Baltic countries
    Martin Lidberg (Lantmäteriet, Sweden)
    Onsite
  • 12:15 – 12:30
    NKG working groups – organisation, projects and activities
    Holger Steffen (Lantmäteriet, Sweden)
    Onsite
  • Lunch is available at the Lantmäteriet restaurant in the same building.
  • Tables are reserved for GGOS Days participants.
  • A buffet is offered, with refills included, for SEK 135 per person (currently about €12),
  • Everyone pays individually.
  • 13:30 – 13:45
    GGOS Bureau of Products and Standards: Update
    Detlef Angermann (DGFI-TUM, Germany)
    Onsite
  • 13:45 – 14:00
    Lunar reference systems
    Agnès Fienga (Geoazur, Unice, France)
    Online
  • 14:00 – 14:15
    Towards an updated reference level ellipsoid
    Urs Marti (swisstopo, Switzerland)
    Online
  • 14:15 – 14:30
    On the implementation status of ITGRF
    Ezequiel Antokoletz (BKG, Germany)
    Onsite
  • 14:30 – 14:45
    Progress on the implementation of the Essential Geodetic Variables
    Thomas Gruber (TUM, Germany)
    Onsite
  • 14:45 – 15:00
    Increased Automation in Geodetic Data Analysis
    Benedikt Soja (ETH Zurich, Switzerland)
    Onsite
  • 15:00 – 15:15
    Summary, wrap up
    Detlef Angermann (DGFI-TUM, Germany)
    Onsite
  • Coffee break is provided at the venue
  • Kindly sponsored by Lantmäteriet
  • 15:45 – 16:00
    IERS Conventions updates
    Sharyl Byram (USNO, USA)
    Online
  • 16:00 – 16:15
    Challenges in the new ITRF operational updates
    Robert Heinkelmann (GFZ, Germany)
    Online
  • 16:15 – 16:30
    Challenges and opportunities in analysing Genesis data
    Johannes Böhm (TU Wien, Austria)
    Online
  • 16:30 – 16:45
    Geophysical models and geodetic data analysis
    Jeff Freymueller (Michigan State University, USA)
    Onsite
  • 16:45 – 17:00
    Correlations in atmospheric parameter estimation
    Benedikt Soja (ETH Zurich, Switzerland)
    Onsite
  • 17:00 – 17:15
    Resilience of IAG Services
    Richard Gross (IAG, USA)
    Onsite
  • 17:15 – 17:30
    Summary, wrap up
    Laura Sánchez (DGFI-TUM, Germany)
    Onsite

19:00 – 22:00

Tuesday, October 6

  • 08:30 – 09:00
    Updates from the Focus Area Artificial Intelligence for Geodesy
    Benedikt Soja (ETH Zurich, Switzerland)
    Onsite
  • 09:00 – 09:15
    Updates from the Focus Area Geodetic Space Weather Research
    Michael Schmidt (DGFI-TUM, Germany)
    Online
  • 09:15 – 09:30
    Understanding Ionospheric and Plasmaspheric Processes
    Fabricio dos Santos Prol (NLS, Finland)
    Online
  • 09:30 – 09:45
    Atmospheric Coupling Studies
    Andres Calabia Aibar (Universidad de Alcalá, Spain)
    Online
  • 09:45 – 10:00
    Thermosphere Modelling and Applications
    Guenther March (ESA, Netherlands)
    Onsite
  • 10:00 – 10:15
    Summary, wrap up
    Michael Schmidt (DGFI-TUM, Germany)
    Online
  • Coffee break is provided at the venue
  • Kindly sponsored by Lantmäteriet
  • 10:45 – 11:00
    News from the GGOS Bureau of Networks and Observations
    José Rodríguez (IGN, Spain)
    Online
  • 11:00 – 11:15
    GGOS Committee on Performance Simulations and Architectural Trade-Offs (GGOS-PLATO): Current Activities and Plans
    Alexander Kehm (BKG, Germany)
    Onsite
  • 11:15 – 11:30
    Protecting VLBI radio frequencies – the role of GGOS and its member countries
    Lucia McCallum (U. Tasmania, Australia)
    Onsite
  • 11:30 – 11:45
    Benefits of eccentric orbits for geodesy
    Joanna Najder (Wroclaw University of Environmental and Life Sciences, Poland)
    Onsite
  • 11:45 – 12:00
    Modern Concepts and Quantum Technology for Geodesy
    Jürgen Müller (Leibniz University Hannover, Germany)
    Online
  • 12:00 – 12:15
    A database for space-geodetic station metadata
    Rebekka Handirk (Chalmers, Sweden)
    Onsite or Online
  • 12:15 – 12:30
    Summary, wrap up
    José Rodríguez (IGN, Spain)
    Online
  • Lunch is available at the Lantmäteriet restaurant in the same building.
  • Tables are reserved for GGOS Days participants.
  • A buffet is offered, with refills included, for SEK 135 per person (currently about €12),
  • Everyone pays individually.
  • 13:30 – 13:40
    IERS – International Earth Rotation and Reference Systems Service
    Daniela Thaller (BKG, Germany)
    Onsite
  • 13:40 – 13:50
    IVS – International VLBI Service for Geodesy and Astrometry
    Lucia McCallum (U. Tasmania, Australia)
    Onsite
  • 13:50 – 14:00
    IGS – International GNSS Service
    Markus Bradke (GFZ, Germany)
    Online
  • 14:00 – 14:10
    ILRS – International Laser Ranging Service
    Toshi Otsubo (Hitotsubashi University, Japan)
    Online
  • 14:10 – 14:20
    IDS – International DORIS Service
    Karine Le Bail (Chalmers, Sweden)
    Onsite
  • 14:20 – 14:30
    PSMSL – Permanent Service for Mean Sea Level
    Elizabeth Bradshaw (National Oceanography Centre, UK)
    Online
  • 14:30 – 14:40
    IGFS – International Gravity Field Service; IDEMS – International Digital Elevation Model Service; BGI – Bureau Gravimétrique International
    Georgios S. Vergos (AUTh, Greece)
    Online
  • 14:40 – 14:50
    IGETS – International Geodynamics and Earth Tide Service
    Ezequiel Antokoletz (BKG, Germany)
    Onsite
  • 14:50 – 15:00
    ICGEM – International Centre for Global Earth Models
    Sinem Ince (GFZ, Germany)
    Online
  • 15:00 – 15:10
    ISG – International Service for the Geoid
    Urs Marti (swisstopo, Switzerland)
    Online
  • 15:10 – 15:20
    Summary, wrap up
    Anna Riddell (Geoscience Australia)
    Onsite
  • Coffee break is provided at the venue
  • Kindly sponsored by Lantmäteriet
  • 15:45 – 16:05
    GGOS Portal: Launch of the New Search Platform for Geodetic Data and Products
    Martin Sehnal (BEV, Austria)
    Onsite
  • 16:05 – 16:25
    Implementing DOIs for data in geodesy
    Kirsten Elger (GFZ, Germany)
    Online
  • 16:25 – 16:45
    A Resilient and Interoperable Future for IAG Data Centers: Improving Efficiency, Sustainability, Reliability, and Redundancy across the Services
    Pat Michael (NASA/GSFC, CDDIS, USA)
    Onsite
  • 16:45 – 17:30
    Discussion, summary, wrap up
    Richard Gross (IAG, USA)
    Onsite

Starts at 18:30

  • All details will be sent by email to all ECS event registered persons

Wednesday, October 7

  • 08:30 – 08:45
    Updates from the Focus Area Geohazards Monitoring: GNSS-enhanced Tsunami Early Warning Systems for Oceania
    Tim Melbourne (CWU, USA)
    Onsite
  • 08:45 – 09:00
    Outcomes of the GGOS Topical Meeting on Geohazards
    Faramarz Nilfouroushan (Lantmäteriet, Sweden)
    Onsite
  • 09:00 – 09:15
    GGOS Japan
    Basara Miyahara
    Onsite
  • 09:15 – 09:30
    GGOS IberAtlantic
    Esther Azcue Infanzón
    Onsite / Online
  • 09:30 – 09:45
    GGOS Africa
    Aletha de Witt
    Onsite
  • 09:45 – 10:00
    GGOS GB Members-at-Large: Progress, Outreach, and Future Initiatives
    Claudia Tocho (UNLP, Argentina)
    Onsite
  • 10:00 – 10:15
    Summary, wrap up
    Claudia Tocho (UNLP, Argentina)
    Onsite
  • Coffee break is provided at the venue
  • Kindly sponsored by Lantmäteriet
  • 10:45 – 11:00
    Can geodetic data contribute to accelerating progress towards the Sustainable Development Goals?
    Liubov Poshyvailo-Strube (UN-GGCE, Germany)
    Onsite
  • 11:00 – 11:15
    Beyond Research: Why Outreach Matters in Geoscience
    Constanza Santori (Universidad de Chile, Chile)
    Onsite
  • 11:15 – 11:30
    Geodesy Outreach: Cartoons, Films and More
    Martin Sehnal (BEV, Austria)
    Onsite
  • 11:30 – 11:45
    Support by IAG and IUGG for symposia and projects: An overview
    Daniela Thaller (BKG, Germany)
    Onsite
  • 11:45 – 12:00
    IAG Early Career Scientist report
    Rebekka Steffen (Lantmäteriet, Sweden)
    Onsite
  • 12:00 – 12:10
    Summary, wrap up
    Martin Sehnal (BEV, Austria)
    Onsite
  • Lunch is available at the Lantmäteriet restaurant in the same building.
  • Tables are reserved for GGOS Days participants.
  • A buffet is offered, with refills included, for SEK 135 per person (currently about €12),
  • Everyone pays individually.

Details will be sent to GGOS Governing Board members in advance.

Topics

  • Updates on global geodetic infrastructure
  • Status of novel satellite missions relevant to Geodesy
  • Optimisation of geodetic infrastructure
  • Updates from the IAG Services
  • Standardisation, integration, and optimisation of geodetic products
  • Essential Geodetic Variables (EGV)
  • Review of requirements and standards for geodetic products
  • Management and dissemination of geodetic data and products
  • Networking with external stakeholders
  • Communication and public outreach
  • Enhancement of geodetic collaboration at regional level
  • Advances of the GGOS Focus Areas: Geodesic Space Weather Research, Artificial Intelligence for Geodesy, Geohazards Monitoring

Dates

Schedule and conference program 31 August 2026
Registration deadline (on-site)6 September 2026
On-site participation confirmation15 September 2026
List of participants 15 September 2026
GGOS Days 2026 5 – 7 October 2026

Registration

The GGOS Days 2026 meeting is open to everyone, but the following colleagues are strongly encouraged to attend:

The meeting will take place in-person and online. Participation is free (no registration fee), but registration is required (see online form below), mainly to ensure room capacity for in-person attendance and to coordinate the online communication. Please only register to attend in-person if you are certain that you will be able to travel to Gävle. By registering, the participants agree that their data will be stored internally in the GGOS records. The data will only be used for meeting-related organisational issues. In-person participation will be confirmed by 15 September. If any registered participant is not able to attend the meeting, they are asked to withdraw their pre-registration as soon as possible (by contact form).

Registration for connected events

Participation Note: Unfortunately the on-site registration is no longer possible (deadline: September 6). But it is still possible to register for remote/online participation.

Register here for GGOS Days 2026

⚠️ registration for remote participation only ⚠️

Travel Award

The GGOS Days 2026 meeting is sponsored by the International Association of Geodesy (IAG) and early career scientists and colleagues from low-income countries may apply for an IAG travel award to facilitate their participation in the meeting. The application should be made at least three months before the meeting and the applicant should present their research results during the meeting. Further details can be found at https://geodesy.science/iag/awards/iag-travel-award/.

Travel

Venue

The GGOS Days 2026 will be hosted by Lantmäteriet, the Swedish Mapping, Cadastral and Land Registration Authority (https://www.lantmateriet.se/en/), located in:

Lantmäterigatan 2C, 802 64 Gävle, Sweden

Gävle (Sweden) is located about 150 km to the north of Stockholm. More information about the city can be found at https://www.visitgavle.se/en.

Arrival

By air : The closest airport is Stockholm Arlanda Airport (airport code ARN), which has daily connections to many European and worldwide destinations through scheduled services of a large number of international airlines. It is the largest airport in Sweden. The airport has frequent train connections to Gävle via the station Arlanda C, which is located between the terminals 5 and 4.

By train: Gävle’s railway station is located very close to the city centre. Timetables and tickets are supplied by SJ, https://www.sj.se/en.

By car: Those wishing to drive to Gävle need to enter the Scandinavian peninsula taking either a ferry to Gothenburg, Stockholm or Trelleborg, or using the Øresund Bridge, the connection between Denmark (Copenhagen) and Sweden (Malmö).

Accommodation

Information about hotel reservation will be provided to onsite participants later.

Visa

Sweden is a member of the European Union; therefore, no visa is needed for E.U. citizens. Non ‐ E.U. participants should contact their nearest Swedish Embassy or Consulate for further information. For a complete list of countries who do need to apply for a visa, check https://www.government.se/government-policy/migration-and-asylum/list-of-foreign-citizens-who-require-visa-for-entry-into-sweden/. If you do need a visa, please visit https://www.government.se/government-policy/migration-and-asylum/information-on-visas/ to find more details. Those who require a formal invitation for the purpose of obtaining a visa, or raising travel funds in their country, may contact the organisation team  . Only those participants who have confirmed their contribution to the GGOS Topical Meeting will receive a formal invitation letter. Travel and medical insurance, if required, are the sole responsibility of the participant.

Contact

GGOS Coordinating Office, contact form

Coordination team

  • Laura Sánchez, President of GGOS, Technische Universität München, Deutsches Geodätisches Forschungsinstitut (DGFI-TUM), Germany
  • Martin Sehnal, Director of the GGOS Coordinating Office, BEV – Federal Office of Metrology and Surveying, Austria
  • Martin Lidberg, Head of Department of Geodetic Infrastructure at Lantmäteriet, Deputy Director of the GGOS Bureau of Networks and Observations (GGOS BNO), Lantmäteriet, the Swedish Mapping, Cadastral and Land Registration Authority, , Sweden
  • Rebekka Steffen, President of IAG Commission 3 (Earth Rotation and Geodynamics), Lantmäteriet, the Swedish Mapping, Cadastral and Land Registration Authority, Sweden
  • Anna Riddell, Vice-president of GGOS, Geoscience Australia, Australia
  • Detlef Angermann, Director of the GGOS Bureau of Products and Standards (GGOS BPS), Technische Universität München, Deutsches Geodätisches Forschungsinstitut (DGFI-TUM), Germany
  • José C. Rodríguez, Director of the GGOS Bureau of Networks and Observations (GGOS BNO), Instituto Geográfico Nacional (IGN), Spain.

Code of Conduct

GGOS follows the Code of Conduct of the International Union of Geodesy and Geophysics (IUGG) and their anti-harassment guidelines. These code and guidelines apply for all GGOS meetings. GGOS opposes any discrimination or harassment based on such factors as age, citizenship, disability, ethnic origin, gender identity, language, political or other opinion, religion, or sexual orientation. We will follow IUGG’s Anti-Harassment Guidelines to prevent any form of harassment or discrimination, and to ensure an inclusive atmosphere that encourages the free expression and exchange of scientific ideas and results.

All attendees of GGOS meetings have a role to play in creating an inviting and harassment-free environment through their own behaviour and by discouraging harassment and discrimination by others.

Expected Behaviour

  • All attendees are treated with respect and consideration, valuing a diversity of views and opinions.
  • The meeting creates an environment to allow for the professional exchange of information.
  • Be considerate, respectful and collaborative. Communicate openly with respect for others, critiquing ideas rather than individuals.
  • Avoid personal attacks directed toward other attendees, the local organisers or guests. Be mindful of your surroundings and of your fellow participants.
  • Alert the local organisers if you notice a dangerous situation or someone in distress.

Unacceptable Behaviour

  • Discrimination, harassment or intimidation is unacceptable and will not be tolerated. The local organisers may take any action necessary and deemed appropriate (see below) if attendees engage in unacceptable behaviour including removal from the meeting without warning or refund.
  • Recording or taking photography of another individual’s presentation without the explicit permission of the authors is not allowed.
  • Disruption of talks at oral or poster sessions, any receptions, or satellite events within the meeting in other venues.

Reporting Unacceptable Behaviour

  • If you are the subject to unacceptable behaviour or may have witnessed such behaviour that violates professional and respectful participant conduct, please immediately notify the chairperson of the session if the incident has occurred during the meeting or local organisers.
  • Notification can be done by contacting a local organiser on-site (e.g. at the registration desk) or you can e-mail your concern by contact form.
  • All reports will remain confidential.

Actions to prevent unacceptable behaviour

  • If a clear case of verbal discrimination, harassment or intimidation during a scientific session is established to have occurred, the Chairperson should act immediately to stop it. If the situation deteriorates, the Chairperson should ask the offender to leave the room.
  • If any form of harassment occurs in a less openly visible way (e.g. during social activities or informal gatherings), the affected person and/or witness(es) should immediately report it to one of the organisers. The affected person has the option to pursue a formal procedure.
  • In cases described above, the organiser should prepare written notes of the incident, attaching any evidence and identifying any witnesses. The organiser should then give the alleged offender the opportunity to be heard and to respond to the allegation.
  • A full report of the incident should then be sent to the organisers via contact form
  • , who will promptly report to the IAG and IUGG Officers any case of harassment that occurred during an IAG or IUGG-supported meeting.
  • Harassment incidents or behaviour that occur outside IAG or IUGG activities referred to above will be considered only when a formal investigation of the case has been conducted by the relevant authority (e.g. the institution, to which the individual is affiliated) and made known to the IAG and IUGG Executive Committees. In those cases that involve an IUGG or Association officer, the Executive Committee may decide to take disciplinary actions against that person.