GRACE Hackweek 5
2025-09-29 - 2025-10-03
An online school on time-variable gravity from GRACE and GRACE-FO satellite missions
Satellite gravimetry has become an indispensible tool for studying the earth system. The satellite missions CHAMP, GRACE/GRACE-FO and GOCE along with Satellite Laser Ranging have demonstrated the utility of time-variable gravity data in understanding the mass changes and their transport within and between the hydropshere, cryosphere, atmosphere, oceans and the solid earth.
The challenging aspects of satellite gravimetry are the recovery of time-variable gravity from observations due to the low signal- to-noise ratio, and the use of time-variable gravity data by non- geodesists. It is our aim in this online school to give an idea of the time variable gravity field recovery process from satellite gravimetry missions, and also to help non-geodesists to get to grips with handling time-variable gravity data from GRACE/GRACE-FO.
The online school is open to everyone interested in using time- variable gravity for their research. Certificates will be issued to participants who complete all the labs. We look forward to your participation and a fruitful online school. The last date of application is September 19, 2025 (UTC).
Registration: https://forms.office.com/r/WzP7GdBbwk
More Info: GRACE Hackweek 5 – Program

Organizing Committee:
Prof. Balaji Devaraju (IIT Kanpur, India); Prof. Nico Sneeuw (Uni. Stuttgart, Germany); Prof. Matthias Weigelt (Leibniz Uni. Hannover, Germany)

South African National Geodesy Workshop
2025-10-01 - 2025-10-02 | South African Astronomical Observatory (SAAO) Auditorium, SAAO, 1 Observatory Rd, Observatory, Cape Town, Cape Town, 7925, South Africa
Towards a National Geodesy Working Group for South Africa
Geodesy — the science of measuring the Earth’s shape, orientation, gravity field, and changes over time — is the foundation of modern mapping, positioning, land administration, infrastructure, and climate monitoring.
South Africa has a proud history in terrestrial and space geodesy, from early triangulation networks to today’s NRF Space Geodesy facilities, TrigNet GNSS stations, tide gauges, and participation in global collaborations. Yet, our efforts remain fragmented across institutions, with limited coordination.
In 2015, the United Nations adopted Resolution A/RES/69/266 on the Global Geodetic Reference Frame for Sustainable Development (GGRF), calling on all countries to strengthen geodetic infrastructure, skills, and governance. South Africa must respond by aligning nationally and globally.
To this end, a National Geodesy Workshop will be convened to:

Bring together key stakeholders in geodesy.
Strengthen coordination of infrastructure, data, services, and skills.
Align with the UN-GGRF agenda.
Establish a National Geodesy Working Group as a formal coordination mechanism.

This is an exciting step towards ensuring that South Africa continues to play a leading role in geodesy, contributing both to national development and the global community.

GRACE-FO Science Team Meeting 2025
2025-10-07 - 2025-10-09 | University of Colorado, Boulder, Boulder, USA
The 2025 GRACE-FO Science Team Meeting will take place from Oct 7-9, 2025, in Boulder, CO (USA), at the University of Colorado, Boulder, in the Village Center! This meeting will be held in hybrid mode (i.e., in-person with live-remote options).
Event Category: igfs

The Arab Conference on Astronomy and Geophysics (ACAG 9)
2025-10-13 - 2025-10-16 | Cairo, Egypt, Cairo, Egypt
Event Category: other

34th CODATA General Assembly
2025-10-17 - 2025-10-18 | Australia, Brisbane, Brisbane, Australia
The 34th CODATA General Assembly will take place on 17-18 October 2025 in Brisbane, Australia, and online. See the letter from CODATA President convening the General Assembly on the dates following the International Data Week 2025.

10th International VLBI Technology Workshop (IVTW)
2025-10-21 - 2025-10-25 | Gothenburg, Sweden, Gothenburg, Sweden
The 10th International VLBI Technology Workshop (IVTW) will take place October 21-25, 2025. The meeting will be hosted by Chalmers University of Technology, Onsala Space Observatory, in Gothenburg, Sweden.
The scope of the workshop is to encompass all areas of VLBI hardware and software development and techniques on station updates, frontends, backends, recorders, correlation, image processing, potential space VLBI missions and RFI monitoring, mitigation and other strategies in today’s rapidly changing environment.
Learn more…

5th IVS Training School on VLBI for Geodesy and Astrometry
2025-10-26 - 2025-10-28 | Sweden, Gothenburg, Gothenburg, Sweden
﻿The aim of this training school is to prepare for the next generation of VLBI, both in terms of technical development and knowledge transfer between generations of researchers. The new VLBI Global Observing System (VGOS) is being installed worldwide and continues to develop. VGOS promises significant improvement in the accuracy of VLBI results. Thus, VGOS will be of great importance for geosciences and global change research as part of the Global Geodetic Observing System (GGOS).
The successful development of VLBI technology in the future requires training and educating the young generation of scientists and their familiarization with all aspects of VLBI technology, starting with VLBI station instrumentation receiving and converting the radio signal, data processing and analysis and obtaining the final results, such as Terrestrial and Celestial Reference Frames and Earth Orientation Parameters.
The IVS Training School is organized by the IVS Committee on Education and Training (IVS CTE)
Details about the school will be made available in due time on the website:
https://www.maanmittauslaitos.fi/en/about-nls/organisation/cooperation-groups/ivs-committee-education-and-training/5th-ivs-training
For further information contact Nataliya Zubko (firstname.lastname@nls.fi)
Event Category: ivs

XVI SIRGAS School “VLBI and SLR Data Processing”
2025-10-27 - 2025-11-01 | Facultad de Ingeniería – Universidad Nacional de San Juan, Av. Libertador Gral. San Martín 1109, J5400ARL San Juan, Argentina, San Juan, Argentina
The XVI SIRGAS School will be held in the beautiful city of San Juan, Argentina, with the aim of training professionals in the field of geodesy through the processing of VLBI (Very Long Baseline Interferometry) and SLR (Satellite Laser Ranging) data, key techniques for the definition of global reference frames.
The purpose of this course is to provide the theoretical concepts and practical tools necessary for the analysis and processing of VLBI and SLR techniques, delving into their application in the definition and maintenance of geodetic reference frames.

IDS DORIS School | DORIS Days 2025
2025-11-03 - 2025-11-05 | National Technical University of Athens, Athens, Greece, Zografos Campus, School of Rural Surveying & Geoinformatics Engineering, Labadarion Building 9 Heroon Polytechniou Street, Athens, 15780, Greece
The IDS is organizing a new edition of the “DORIS Days” designed to offer both a foundational and hands-on experience with DORIS and the IDS community, tailored especially to early-career researchers and students.
Monday, 3 November (second half of UTC day)
Introductory and advanced presentations on the DORIS system, IDS, precision applications, and associated tools and products.
Venue: online only
Wednesday, 5 November (full day, hybrid with in-person participation strongly encouraged)
Introduction to handling and processing DORIS data, with theoretical lectures and guided practical sessions using Jupyter Notebook.
Venue: National Technical University of Athens, Greece – Zografos Campus, School of Rural Surveying & Geoinformatics Engineering, Labadarion Building 9 Heroon Polytechniou Street, 15780 Athens
Learn More: https://ids-doris.org/ids/meetings/ids-meetings.html%20

DORIS Analysis Working Group Meeting
2025-11-06 - 2025-11-07 | Athens, Greece, Athens, Greece
Dates: November 6 (full day) & 7 (morning), 2025
Local host: Maria Tsakiri (NTUA)
Meeting location: National Technical University of Athens, Greece – Patision Campus 28th Oktovriou (Patision) Avenue No 42, 10682 Athens
Hybrid meeting
Other related event (invitation-only): Governing Board hybrid meeting, Friday November 7 (TBD)

More information: https://ids-doris.org/ids/meetings/ids-meetings.html

"Talks on GIA" seminar
2025-11-06 17:00 - 18:00 (Europe/Berlin)
“Talks on GIA” seminar – Constraining GIA where the mantle is heterogeneous AND Community Priorities for GNSS Measurements
We will have two presentations.

Erica Lucas (University of California, Santa Cruz, USA) will present “Constraining Glacial Isostatic Adjustment where the mantle is heterogeneous”.
Terry Wilson (Ohio State University, Columbus, USA) will present “Community Priorities for GNSS Measurements to Constrain GIA – Results of a Survey”

“Constraining Glacial Isostatic Adjustment where the mantle is heterogeneous”
To date, investigations of the impact of 3-D Earth structure on GIA have adopted solid Earth viscoelastic models based on global- and continental-scale seismic imaging, with variability at spatial length scales >150 km. However, regional body-wave tomography shows mantle structure variability at smaller length scales (∼50–100 km) in central West Antarctica. We investigate the effects of incorporating smaller-scale lateral variability in upper-mantle viscosity into 3-D GIA simulations, finding that upper-mantle structure at the glacial drainage basin scale is found to impact GIA model predictions for modern and projected ice mass changes. Differences between simulations adopting upper-mantle viscosity structure inferred from regional- versus coarser continental-scale seismic imaging are large enough to impact the interpretation of crustal motion observations from GNSS and reach up to ∼15 % of the total predicted sea level change during the instrumental record.
“Community Priorities for GNSS Measurements to Constrain GIA – Results of a Survey”
A survey in 2025 revealed community views on the most pressing science questions in Antarctica that can be addressed using GNSS measurements and on the regions in Antarctica where in situ GNSS observations will be most helpful in answering these science questions. A summary of survey results will be presented for discussion.

AGU25 - GGOS Session
2025-12-15 - 2025-12-19 | New Orleans, USA, New Orleans, United States
The AGU Annual Meeting 2025 brings together geoscientists from all over the world to one meeting covering all disciplines of the Earth, planetary, and space sciences.
GGOS is planning to have it’s own session. More information will follow…

AGU Annual Meeting 2025
2025-12-15 - 2025-12-19 | New Orleans, USA, New Orleans, United States
Event Category: agu

Munich 2026 | REFAG Symposium + Unified Analysis Workshop UAW
2026-03-02 - 2026-03-06 | LDBV – Landesamt für Digitalisierung, Breitband und Vermessung, Alexandrastraße 4, Munich, 80538, Germany
The Technical University of Munich (TUM) is proud to lead global geodetic research as it currently holds the presidents of Commission 1 “Reference Frames” of the International Association of Geodesy (IAG) and the IAG Global Geodetic Observing System (GGOS). In this prominent role, TUM is excited to host two landmark events in 2026:

The IAG International Symposium on Reference Frames for Applications in Geosciences (REFAG2026), 2–4 March 2026, and
The joint GGOS/IERS (International Earth Rotation and Reference Systems Service) Unified Analysis Workshop (UAW2026), 5–6 March 2026

These events will bring together leading experts, researchers, and institutions to shape the future of global geodesy — right here at TUM in Munich, Germany.
Please find more information here…

PhHS-IHRF2026 - Int. Symposium on Physical Height Systems and the IHRF
2026-04-07 - 2026-04-09 | General Authority for Survey and Geospatial Information (GEOSA), Riyadh, Kingdom of Saudi Arabia
The PhHS-IHRF2026 “International Symposium on Physical Height Systems and the International Height Reference Frame” will be held in Riyadh, Kingdom of Saudi Arabia from 7 to 9 April 2026. It focuses on methods for observing, estimating and interpreting the Earth’s gravity field and the geoid with special emphasis on height systems, physical height determination and the realization of the International Height Reference System (IHRS) into the International Height Reference Frame (IHRF). PhHS-IHRF2026 is a Joint IAG Symposium co-organized by IAG SC2.2 “Geoid, Physical Height Systems and vertical datum unification”, SC2.4 “Gravity and Geoid”, the International Gravity Field Service (IGFS) and the Global Geodetic Observing System (GGOS).
Scientific Organizing Committee:
George Vergos (SC2.2 Chair, IHRF CC director, IGFS CB Director)
Rossen Grebenitcharsky (SC2.2 Vice-Chair)
Riccardo Barzaghi (IGFS President)
Laura Sanchez (GGOS President)
Hussein Abd-Elmotaal (SC2.4 Chair)
Rene Fordberg
Zuheir Altamimi
Local Organizing Committee:
AlShahrani Sultan Falah
Mohammed AlArjani
Mashael AlHarbi
Saad AlQahtani
Abdulmohsen AlDosari
Saleh AlFaris
Eslam Abdulsamie

ENC2026 European Navigation Conference
2026-04-28 - 2026-04-30 | Austria Center Vienna, Bruno-Kreisky-Platz 1, Vienna, 1220, Austria
We are pleased to announce the next edition of the European Navigation Conference series, ENC 2026, will take place in Vienna, April 28-30, 2026.
The ENC-series is now widely acknowledged as the most important annual event in Europe bringing together the full positioning, navigation and timing community.
What you can expect at ENC2026:

Technical programme across three days with up to four parallel sessions;
Daily keynote addresses in plenary, bringing the community together;
A friendly and collaborative atmosphere, with opportunities to meet exhibitors and fellow delegates, including informally over drinks and dinner as part of the conference social programme;
An environment to gain insights, grow your network and foster new collaborations.

The ENC-series is a collaboration across the European Group of Institutes of Navigation (EUGIN), with the Austrian Institute of Navigation (OVN) leading ENC 2026 at the Austria Center Vienna (ACV).
The conference will highlight the latest advancements in positioning, navigation and timing. The broad technical program will include all related aspects of technology, science, systems and applications.
ENC-series is open to all from across industry, academia, government and user segments. Whatever your level of knowledge and experience, you will find a warm welcome and have much to gain by joining ENC2026.
We warmly invite you to join us in Vienna. Please do prepare your abstract, review our sponsorship opportunities and save the date to join us.
These web pages will remain the hub of latest information as we move towards the conference in April 2026. Please sign up here to receive regular updates by e-mail and also follow us on LinkedIN via the QR code below.
See you at #ENC2026 in Vienna!
https://enc-series.org/

EGU General Assembly 2026
2026-05-03 - 2026-05-08 | Vienna, Austria, Vienna, Austria
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Event Category: egu

IAG Geodesy Reception 2026
2026-05-04 - 2026-05-07 | BEV – Federal Office of Metrology and Surveying, Schiffamtsgasse 1-3, Vienna, 1020, Austria
The Geodesy Reception 2026 is planned to take place in the evening during one of the weekdays of the EGU General Assembly 2026 (May 4–7, 2026). The exact date, time, and venue will be announced later. See recap of last years Geodesy Reception 2025. Stay tuned for further updates!
Registration
Registration will be required, as space will be limited. Attendance is only possible with confirmed registration. All details will be published later …
Geodesy Cartoon Competition – Winner Announcement
As a special highlight, the winners of the Geodesy Cartoon Competition will be officially announced during the event. In addition the Top 5 rated cartoon submitter of each category will receive a guaranteed reservation for the Geodesy Reception 2026. Read more: https://geodesy.science/cartoon/competition/

JpGU-AGU Joint Meeting 2026
2026-05-24 00:00 - 2026-05-29 23:59 (Asia/Tokyo) | JpGU-AGU Joint Meeting 2026, Chiba, Japan
JpGU-AGU Joint Meeting 2026 is the first joint meeting with AGU since 2020. As in recent years, we plan to hold the meeting in the hybrid format, mixing on-site (at Makuhari Messe in Chiba City) and online. https://www.jpgu.org/meeting_e2026/news/news20250917_01.html

FIG CONGRESS 2026
2026-05-24 - 2026-05-29 | Cape Town, South Africa, Cape Town, South Africa
FIG and the local organisers are looking forward to welcoming you to Cape Town.
Reserve the dates: 24-29 May 2026 The four congress dates are 25-28 May 2026 and the two General Assembly days 24 and 29 May 2026 and with various pre events primarily on 24 May.
Event Category: fig

IGS Workshop 2026
2026-06-01 - 2026-06-05 | InterContinental Hotels Santiago, Av. Vitacura 2885, Santiago de Chile, 7550023, Las Condes, Chile
Chile – where the crust trembles daily and even a traditional cocktail is nicknamed the “Earthquake” – will become the epicenter of an unprecedented scientific gathering in South America.
On behalf of the Local Organizing Committee, we are pleased to formally announce the International GNSS Service (IGS) Workshop 2026, which will take place from the 1st to the 5th of June 2026 at the Intercontinental Santiago.
The IGS Workshop serves as the premier global forum for advancing GNSS and geodesy. Hosted jointly by the University of Santiago de Chile (USACH) and the Military Geographic Institute (IGM), the 2026 edition will bring together leading experts, researchers, and practitioners to exchange insights, showcase technological breakthroughs, and define the trajectory of global geodetic infrastructure.
Key Details :

Dates : 1-5 June 2026
Venue : Intercontinental Santiago (Avenida Vitacura 2885, 7550023 Las Condes, Región Metropolitana, Chile)
Website : https://www.igs-workshop-2026.com
General Inquiries : workshop2026@igs.org

EU-wide Community Workshop on Quantum Gravimetry
2026-06-03 - 2026-06-05 | GFZ Helmholtz Centre for Geosciences, Potsdam, Germany
Dear community,
I am very happy to announce the first EU-wide community workshop by the HORIZON EUROPE project “EQUIP-G”. It will take place from 3.6. to 5.6.2026 at GFZ Helmholtz Centre for Geosciences (Potsdam, Germany).
Please see the attached flyer.
This email indents to inform you about this meeting and provide you the possibility to mark the dates in advance in your calendar. We are not yet sure if there will be a hybrid option (most likely not, but information will follow). EQUIP-G in a nutshell: we are developing and deploying a quantum gravimeter network within Europe. This task involves joint activities amongst:

quantum gravimeter instrument testing and metrology
running dedicated use cases across Europe to showcase and investigate this technology with respect to its potential and added value for real world geoscientific and society-relevant applications
develop and test an airborne quantum gravimeter sensor
data management and IT infrastructure for data hosting and sharing following FAIR principles
initiating the creation of a new EPOS technical core service for gravimetry
create an infrastructure in form of a shared park of quantum gravimeters, which hopefully in the future will enable all interested stakeholders to have low-cost access to this new technology

But of course the most important thing is to involve all interested people from the community – you! To shape the future of how, by whom and for what quantum gravimeters will be used and how this technology will develop, also in the European context.
We are eager to meet with the entire community, present first results, exchange ideas, get feedback and opinions and actively use this input! We would be very happy to see many of you attending this workshop and join a lively discussion!
More information will follow in the upcoming months.
If you want to know more about EQUIP-G you can visit our LinkedIn page: https://www.linkedin.com/company/equip-g/ (official project website coming soon!) and/or have a look at the EU Commission information: https://cordis.europa.eu/project/id/101215427.
Best regards,
Marvin Reich (WP lead community building) and the entire EQUIP-G team!

COSPAR 2026 - Scientific Assembly of the Committee on Space Research
2026-08-01 - 2026-08-09 | Fortezza da Basso, Viale Filippo Strozzi 1, Florence, Italy
46th Scientific Assembly of the Committee on Space Research (COSPAR) and Associated Events “COSPAR 2026”
Please find more info here: https://cospar2026.org/

VieVS Days 2026
2026-09-15 - 2026-09-16 | TU Wien, Vienna, Austria
The two-day workshop will cover the basics of analysing VLBI geodetic data, simulations and scheduling. Participants will have the opportunity to apply their learning through hands-on exercises utilising VieVS & VieSched++.

IAG Commission 3 - TIGER Symposium in Geodesy
2026-09-28 - 2026-10-01 | Gävle, Sweden, Gävle, Sweden
We will be hosting three consecutive meetings in Gävle (Sweden) in autumn 2026. Please join us for:

Tracking and Investigating Geodynamics and Earth Rotation – TIGER Symposium in Geodesy (the 1st symposium of the IAG Commission 3 on Earth Rotation and Geodynamics, in cooperation with the Journees meeting series) – September 28th to October 1st, 2026
GGOS Topical Meeting on Geohazards – October 1st and 2nd, 2026
GGOS Days 2026 – October 5th to 7th, 2026

The meetings will be in a hybrid format. More details (e.g., website, registration, abstract submission) will be shared soon. We’re looking forward seeing you in autumn 2026!
Sincerely, Rebekka Steffen (IAG commission 3 president), Laura Sanchez (GGOS President), Martin Sehnal (GGOS Coordinating Office)

GGOS Days 2026 + GGOS Topical Meeting on Geohazards
2026-10-01 - 2026-10-07 | Gävle, Sweden, Gävle, Sweden
﻿We will be hosting three consecutive meetings in Gävle (Sweden) in autumn 2026. Please join us for:

Tracking and Investigating Geodynamics and Earth Rotation – TIGER Symposium in Geodesy (the 1st symposium of the IAG Commission 3 on Earth Rotation and Geodynamics, in cooperation with the Journees meeting series) – September 28th to October 1st, 2026
GGOS Topical Meeting on Geohazards – October 1st and 2nd, 2026
GGOS Days 2026 – October 5th to 7th, 2026

The meetings will be in a hybrid format. More details (e.g., website, registration, abstract submission) will be shared soon. We’re looking forward seeing you in autumn 2026!
Sincerely, Rebekka Steffen (IAG commission 3 president), Laura Sanchez (GGOS President), Martin Sehnal (GGOS Coordinating Office)

Gravity Geoid and Height Systems Symposium (GGHS2026)
2026-10-12 - 2026-10-16 | Indian National Science Academy, New Delhi, India
The Gravity, Geoid and Height Systems Symposium (GGHS) is a leading international meeting organized under the International Association of Geodesy (IAG). It brings together experts, researchers, and students to discuss the latest developments in gravity field modeling, geoid determination, height systems, and their applications in Earth sciences and society.
The next edition, GGHS2026, will continue this tradition by providing a forum for exchanging ideas, presenting new research, and fostering collaboration across the global geodetic community.

The official website with full details will be available soon.

AGU Annual Meeting 2026
2026-12-07 - 2026-12-11 | San Francisco, USA, San Francisco, USA

EGU General Assembly 2027
2027-04-04 - 2027-04-09 | Vienna, Austria, Vienna, Austria
Event Category: egu

IUGG General Assembly 2027
2027-07-16 - 2027-07-22 | Incheon, South Korea, Incheon, South Korea
This IUGG General Assembly will get under way at Incheon’s Songdo Convensia in July 2027. Incheon is expecting more than 5,000 scientists and experts from both Korea and abroad to attend the event.
Event Category: iugg
