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BEGIN:VEVENT
DTSTART;TZID=UTC:20261016T150000
DTEND;TZID=UTC:20261016T160000
DTSTAMP:20260922T064645Z
CREATED:20260922T064645Z
LAST-MODIFIED:20260922T064645Z
UID:39216-1792162800-1792166400@geodesy.science
SUMMARY:Talks on GIA Seminar
DESCRIPTION:Alexandre Couhert and Maxime Rousselet\, both at Centre national d’études spatiales (CNES)\, Toulouse\, France \nwill present \nPart I (Alexandre):\nSatellite altimetry sea level rise estimates and ocean mass trends derived from satellite gravimetry both rely on solid Earth/pole tides and GIA models\, to remove these signals from GRACE/-FO and altimeter based sea surface height observations\, and access to the secular variations in these global-scale mass transfers. In 2015\, a concern was raised concerning the consistency of the recommended modeling approach in the International Earth Rotation Service (IERS) Conventions and updates were proposed since then to accommodate this issue. Nowadays\, with hindsight\, additional inconsistencies may arise when combining these different geophysical models. \nPart II (Maxime):\nSolid Earth models are crucial for interpreting space-geodetic observations\, yet mantle rheology remains inconsistently treated across time-scales. A self-consistent framework must capture elastic\, transient\, and viscous deformation. In particular\, the transient rheology below the asthenosphere\, acting in the interannual to centennial band\, remains poorly constrained. Previous studies estimated tidal-band attenuation from a-posteriori gravity fields\, losing the covariance information contained in the observations. Incorporating rheology directly into orbit determination overcomes this limitation. What is the amplitude of the mantle’s transient response below the asthenosphere?\nWe address this by combining consistent orbit and rheology modeling with independent geophysical constraints. Analytical orbital perturbation theories describe satellite responses to anelastic pole tide and long-period zonal solid Earth tides\, showing why these signals should be analyzed jointly. We use this framework to estimate Extended Burgers parameters\, supported by a comprehensive error budget covering constellation design\, formal uncertainties\, other rheological parameters\, and residual gravity-field errors.\nWe further assess implications for climate-related quantities derived from space geodesy. For GRACE/-FO estimates of barystatic sea-level change\, rheological treatment can introduce a systematic trend bias exceeding 10%. This highlights the importance of transient mantle deformation for interpreting long-term satellite records and motivates a consistent solid Earth framework across time-scales for both mantle characterization and climate monitoring.
URL:https://geodesy.science/event/talks-on-gia-seminar-8/
CATEGORIES:Commission 3,IACS
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Joint IAG-IACS Commission on Cryospheric Deformation (Sub-Commission 3.4)":MAILTO:matthias.willen@tu-dresden.de
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20261013
DTEND;VALUE=DATE:20261016
DTSTAMP:20260803T073036Z
CREATED:20260803T073036Z
LAST-MODIFIED:20260803T073036Z
UID:37833-1791849600-1792108799@geodesy.science
SUMMARY:GRACE/GRACE-FO Science Team Meeting 2026
DESCRIPTION:Yearly meeting addressing satellite gravimetry (data processing & applications)\, in particular related to the GRACE satellite missions\, but also including planned missions such as NGGM/MAGIC or other future mission concepts. \nOverview on planned sessions: \nA. GRACE and GRACE-FO Geodesy:\nA.1 GRACE-FO Project Status\, A.2 Analysis Techniques & Inter-comparisons\, A.3 GRACE-C\, NGGM\, and Future Missions\, A.4 The Mean Earth Gravity Field \nB. Geophysics & Climate Science Applications:\nB.1 Solid Earth Sciences\, B.2 Cryosphere\, B.3 Oceanography\, B.4 Hydrology\, B.5 Multidisciplinary Science\, B.6 Towards the Operational Use of Satellite Gravimetry \nFurther details are provided at the meeting website.
URL:https://geodesy.science/event/grace-grace-fo-science-team-meeting-2026/
LOCATION:GFZ Helmholtz Centre for Geosciences in Potsdam\,\, Potsdam\, Germany
CATEGORIES:Commission 2,ICCC,ICGEM,IGFS,Projet QuGe
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/GRACE_NASA__1__Copyright-aei.mpg.de_2025-09-15.png
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20261013
DTEND;VALUE=DATE:20261016
DTSTAMP:20260116T085845Z
CREATED:20260113T112535Z
LAST-MODIFIED:20260116T085845Z
UID:32647-1791849600-1792108799@geodesy.science
SUMMARY:21st Wegener Assembly\, Albania
DESCRIPTION:The Institute of Geosciences (IGEO) and joint IAG-IASPEI sub-commission “Seismo-geodesy” are delighted to invite you to the 21st WEGENER Assembly\, which will take place in Tirana\, Albania\, from October 13–15\, 2026. \nWEGENER meetings gather geodesists and geoscientists working in the Mediterranean\, earthquake processes and geodynamics. The WEGENER meeting is supported by International Association of Geodesy (IAG) and the International Association of Seismology and Physics of the Earth’s Interior (IASPEI)\, through Sub-commission 3.5 “Seismo-Geodesy” joint between IAG and IASPEI. \nWhether you are an established researcher\, an early-career scientist\, or a student\, Wegener assembly offers a unique opportunity to exchange ideas\, develop collaborations\, and strengthen our scientific community. \nThe meeting will be hosted by the Institute of Geosciences part of Polytechnic University of Tirana. \nAbstract submission and registration will open February\,2 2026. Early-bird registration will be available until July 15\, 2026. Proposed sessions are: \n1. Motion and deformation of the Mediterranean: from kinematics to dynamics\n2. Plate Boundary and Intraplate Processes from Geodetic Observations\n3. Faults and Earthquake Cycle Processes\n4. Geodesy Contribution to Seismic Hazard Assessment & Mitigation\n5. Surface Processes\, Hydrology\, and Anthropogenic Deformation\n6. Emerging Methods and Infrastructures\n7. Volcano and Volcano-Tectonic Deformation \nBeyond the science\, Tirana offers a lively and welcoming atmosphere\, with a blend of Ottoman\, Italian\, and modern architecture\, a vibrant café culture\, and easy access to Albania’s stunning landscapes from the Adriatic coast to the mountains and historical UNESCO World Heritage sites. Its central location and well-connected airport make it a really accessible and attractive destination for colleagues from all over Europe and beyond. \nWe warmly invite you to be part of WEGENER 21st Assembly and to contribute to advancing seismo-geodesy research in the Mediterranean and beyond.
URL:https://geodesy.science/event/21st-wegener-assembly-albania/
LOCATION:Polytechnic University of Tirana\, “Dëshmorët e Kombit”\, Square “Nënë Tereza”\, Tirana\, 1001\, Albania
CATEGORIES:Commission 3,IASPEI
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/21st-Wegener-Assembly.png
ORGANIZER;CN="SC 3.5 Seismo-geodesy":MAILTO:wegener2026@sciencesconf.org
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20261007
DTEND;VALUE=DATE:20261010
DTSTAMP:20260423T103027Z
CREATED:20260423T103027Z
LAST-MODIFIED:20260423T103027Z
UID:35616-1791331200-1791590399@geodesy.science
SUMMARY:ESA 10th International Colloquium on GNSS
DESCRIPTION:The topics of the conference include:\no   Time and Frequency Principles and Novel Clock Technologies\no   Scientific Aspects of Positioning and Navigation Applications\no   Reference Frames and Precise Orbit Determination\no   Navigation for Lunar and for Space Applications\no   Scientific Opportunities enabled by GNSS and PNT systems\no   Geodesy\, Geophysics and Earth Sciences\no   Fundamental Physics\no   GNSS Remote Sensing\, Reflectometry and Atmosphere Sounding\no   Optical and Quantum Principles and Technologies for PNT\n\nThe abstract submission has been extended to 8 May\, 2026. The selected papers will be published in Advances in Space Research.\n\nSee the website for details:\nhttps://atpi.eventsair.com/10th-gnss-science-colloquium/
URL:https://geodesy.science/event/esa-10th-international-colloquium-on-gnss/
LOCATION:École de technologie supérieure (ETS) of Quebec\, Montreal\, Canada
CATEGORIES:Commission 1,GGOS,IDS,IERS,IGS,ILRS,IVS
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/7bd4e54f6bbd4e06b82efc5cd1ea9835__1__Copyright-ESA_2026-04-22_efbb15.png
ORGANIZER;CN="European Space Agency (ESA)":MAILTO:esaconferencebureau@atpi.com
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260928
DTEND;VALUE=DATE:20261002
DTSTAMP:20251017T130541Z
CREATED:20250224T061238Z
LAST-MODIFIED:20251017T130541Z
UID:25562-1790553600-1790899199@geodesy.science
SUMMARY:IAG Commission 3 - TIGER Symposium in Geodesy
DESCRIPTION:  \n\nWe will be hosting three consecutive meetings in Gävle (Sweden) in autumn 2026. Please join us for: \n\nTracking 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\nGGOS Topical Meeting on Geohazards – October 1st and 2nd\, 2026\nGGOS Days 2026 – October 5th to 7th\, 2026\n\nThe 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! \nSincerely\, Rebekka Steffen (IAG commission 3 president)\, Laura Sanchez (GGOS President)\, Martin Sehnal (GGOS Coordinating Office)
URL:https://geodesy.science/event/tiger-symposium-commission3/
LOCATION:Gävle\, Sweden\, Gävle\, Sweden
CATEGORIES:Commission 3
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/tiger_logo_w-text_figure-website-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260914T120000
DTEND;TZID=UTC:20260916T130000
DTSTAMP:20260720T055819Z
CREATED:20260127T071606Z
LAST-MODIFIED:20260720T055819Z
UID:32840-1789387200-1789563600@geodesy.science
SUMMARY:ITGRF Workshop 2026
DESCRIPTION:The 2026 ITGRF workshop will provide an excellent opportunity to advance the International Terrestrial Gravity Reference Frame and to discuss current activities within the IAG Joint Working Group 2.1.1. The workshop will focus on ensuring the compatibility of absolute gravity observations\, establishing and maintaining gravity reference stations\, and developing a modern\, user-oriented infrastructure for end-users. It will bring together experts in absolute gravimetry\, gravity monitoring\, and reference frame realization to exchange knowledge and coordinate future work. \nThe International Terrestrial Gravity Reference Frame (ITGRF) is developed by the International Association of Geodesy and is based on accurate observations from absolute gravimeters and continuous gravity monitoring at reference stations. Its primary objective is to replace the obsolete International Gravity Reference Standardization Network (IGSN71) defined in the early 1970s with a modern\, consistent global gravity reference. \nThe workshop will be hosted in 2026 by the British Geological Survey’s Space Geodesy Facility at Herstmonceux Castle in East Sussex\, a site with a strong scientific heritage as the former home of the Royal Greenwich Observatory. \n\nBooking/registration information is available under: https://www.eventbrite.co.uk/e/the-iag-jwg-211-workshop-for-the-development-of-the-itgrf-tickets-1986065996860\nThe Session plan is available here: https://share.bkg.bund.de/x/HoCpBw\nMore info here [PDF]
URL:https://geodesy.science/event/second-itgrf-workshop/
LOCATION:Herstmonceux Castle\, Hailsham\, East Sussex\, United Kingdom\,
CATEGORIES:BGI,Commission 2,IGFS
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/ITGRF_workshop_2026-1-e1769498104146.png
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260831
DTEND;VALUE=DATE:20260904
DTSTAMP:20260410T120413Z
CREATED:20260410T120413Z
LAST-MODIFIED:20260410T120413Z
UID:35291-1788134400-1788479999@geodesy.science
SUMMARY:Workshop on GNSS Ionosphere (IWGI2026)
DESCRIPTION:Welcome to the Workshop on GNSS Ionosphere (IWGI2026) – Remote Sensing Techniques and Applications\nThe “Workshop on GNSS Ionosphere (IWGI2026) – Remote Sensing Techniques and Applications” will take place as in-person format during 31st August – 4th September\, 2026 in Neustrelitz\, Germany. Participants and speakers will only be able to participate onsite at DLR site Neustrelitz. \nThe IWGI2026 will provide a platform for scientists and engineers to communicate and exchange their views on ionospheric observations\, new methods\, retrieval methods\, data fusion\, applications and future challenges. The workshop is open to contributions on latest results and developments in ionosphere reconstruction\, spatial and temporal gradients modelling\, monitoring techniques and prediction methodologies as well as ionospheric scintillation and propagation effects on microwave space-based geodetic techniques (e.g. GNSS\, SLR\, VLBI\, DORIS etc.) and their mitigation using multi-frequency\, multi-sensors observations. Latest results and developments relevant to the use of remote sensing techniques such as GNSS reflectometry for providing all-weather\, high-resolution measurements of ocean winds\, sea-level height\, soil moisture\, and ice/snow thickness are also welcome. \nWe are inviting contributions covering lower atmosphere monitoring\, solar flare effects on the lower ionosphere and detection using VLF\, GNSS signals and radar measurements\, ionospheric effects on GNSS reflectometry retrievals as well as GNSS radio occultation retrievals and climate data records and applications of such records for climate related studies. Space weather impact studies on Earth/Space systems and infrastructures are also welcome. \nAll Study and Working Groups within IAG (International Association of Geodesy) Sub-Commission 4.3: Atmosphere Remote Sensing under Commission 4 “Positioning and applications” (2023 – 2027) are cordially invited to present their work. Eligible applicants (Early Carrier Scientist from low/mid economic countries) may submit their request for travel grants. For more information\, please check IAG website (https://geodesy.science/iag/awards/iag-travel-award/). \nOn behalf of the Organizing Committee\, we are pleased to invite you to attend the Workshop on GNSS Ionosphere (IWGI2026) – Remote Sensing Techniques and Applications. For any questions\, or comments please feel free to contact the Local Organizing Committee (LOC) at DLR\, Neustrelitz. \nWe are looking forward to meeting you at the IWGI2026. \nKind regards\, \n\nDr. M Mainul Hoque (Mainul.Hoque@dlr.de)\nDr. Maximilian Semmling (Maximilian.Semmling@dlr.de)\nDr. Norbert Jakowski (Norbert.Jakowski@dlr.de)
URL:https://geodesy.science/event/workshop-on-gnss-ionosphere-iwgi2026/
LOCATION:German Aerospace Center (DLR)\, Kalkhorstweg 53\, Neustrelitz\, 17235\, Germany
CATEGORIES:Commission 4
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/headerImagePath_dlr_1_en.jpg
ORGANIZER;CN="German Aerospace Center (DLR)":MAILTO:iwgi2026@dlr.de
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260825
DTEND;VALUE=DATE:20260829
DTSTAMP:20260316T113957Z
CREATED:20260316T113957Z
LAST-MODIFIED:20260316T113957Z
UID:34297-1787616000-1787961599@geodesy.science
SUMMARY:Summer School: satellite-based hydrological data assimilation
DESCRIPTION:Geodesy group of Aalborg University is planning to have a summer school at the Geodesy Group\, Aalborg University\, August 25-28 2026. The school will be for four days and focusing on training Early Careers to improve their skill of satellite data processing and hydrological data assimilation. The program will be ~50%-50% on theory and practical sessions. The focus will be on advanced techniques and open challenges in measuring and modeling the water cycle\, as well as integrating satellite-based observations\, including Satellite Gravity (GRACE/GRACE-FO and future missions NGGM/MAGIC)\, Satellite Altimetry (Sentinel and SWOT)\, and Soil Remote Sensing into large-scale hydrological models. Participants will be introduced to ensemble-based sequential Data Assimilation techniques for merging satellite data with models. The school emphasises hands-on learning\, featuring practical exercises in Python\, along with various interactive activities. \nThe school is free of charge\, but a registration process will be followed to select the most relevant audiences. The registration link will be announced soon.
URL:https://geodesy.science/event/summer-school-satellite-hydrological-data/
LOCATION:Geodesy group\, Aalborg University\, Rendsburggade 14\, Aalborg\, 9000\, Denmark
CATEGORIES:AGU,Commission 2,ECS,EGU,GGOS,IAHS,ICCC,ICGEM,UN (United Nations),📚 Education & Training
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/Summer_School.jpg
ORGANIZER;CN="Ehsan Forootan%2C Aalborg University":MAILTO:efo@plan.aau.dk
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260708T150000
DTEND;TZID=UTC:20260708T160000
DTSTAMP:20260513T080930Z
CREATED:20260513T080930Z
LAST-MODIFIED:20260513T080930Z
UID:36272-1783522800-1783526400@geodesy.science
SUMMARY:Talks on GIA Seminar
DESCRIPTION:Tao Yuan (University of Colorado\, USA) working with\nShijie Zhong\, Glenn Milne\, Donna dePolo \nwill present \nReconciling inferences of mantle viscosity and late Quaternary ice history – the importance of an asthenosphere and 3-D viscosity \nDeglaciation history models from the last glacial maximum (LGM) and accompanying mantle viscosity structures have been jointly constrained by fitting the paleo-sea level data through glacial isostatic adjustment (GIA) modeling. However\, some GIA-inferred 1-dimensional (1-D) viscosity models\, including the widely used VM5a\, contradict the mantle viscosity structure inferred using other approaches\, such as seismic imaging\, mineral physics and geodynamics. Here we show that GIA models with realistic 3-D mantle viscosity derived from seismic structures with an effective activation energy of 300-400 kJ/mol and a weak asthenosphere fit paleo-sea level data in North America better than several widely used 1-D GIA models. Our results also demonstrate that the inclusion of the asthenosphere and lateral viscosity variations permits a larger range of North American ice sheet reconstructions that produce quality fits to the sea-level data\, including models with substantially greater volume at LGM\, thus identifying a potential solution to balancing the sea level budget during this key climate event. To fit far-field sea level data\, the ice volume at LGM in North America is required to be 10%-20% larger than that in ICE-6G\, if ice models outside North America are unchanged.
URL:https://geodesy.science/event/talks-on-gia-seminar-7/
CATEGORIES:Commission 3,IACS
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Joint IAG-IACS Commission on Cryospheric Deformation (Sub-Commission 3.4)":MAILTO:matthias.willen@tu-dresden.de
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260623
DTEND;VALUE=DATE:20260626
DTSTAMP:20260209T094529Z
CREATED:20251118T103103Z
LAST-MODIFIED:20260209T094529Z
UID:31854-1782172800-1782431999@geodesy.science
SUMMARY:EUREF Symposium 2026
DESCRIPTION:EUREF is the International Association of Geodesy (IAG) Reference Frame Sub-Commission for Europe. The EUREF Symposium has been organized since 1990 and the scope of the symposium covers EUREF activities\, such as the realisation\, maintenance\, and usage of ETRS89\, EVRS and the EUREF Permanent Network. \nMore Info – Event Website: https://euref2026.sciencesconf.org/ \n 
URL:https://geodesy.science/event/euref-symposium-2026/
LOCATION:ENSA Paris-Val de Seine\, 3/15\, quai Panhard et Levassore\, Paris\, 75013\, France
CATEGORIES:Commission 1
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/EUREF-Symposium2026.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260611T150000
DTEND;TZID=UTC:20260611T160000
DTSTAMP:20260424T132633Z
CREATED:20260424T132633Z
LAST-MODIFIED:20260424T132633Z
UID:35665-1781190000-1781193600@geodesy.science
SUMMARY:Talks on GIA Seminar
DESCRIPTION:Achraf Koulali (Newcastle University\, UK) and Matt King (University of Tasmania\, Australia) will present: \n“Sensitivity of Antarctic GPS time series to varying surface mass balance loads\, and implications for estimates of Glacial Isostatic Adjustment” \nAntarctic Global Positioning System (GPS) vertical time series exhibit non-linear signals across a wide range of temporal scales\, complicating the interpretation of long-term deformation associated with Glacial Isostatic Adjustment (GIA). One important contributor to these non-linearities is the short-term elastic response of the solid Earth to contemporaneous surface mass balance (SMB) variability. During the first part of this talk\, we will show analysis results of GPS vertical displacement time series from the Transantarctic Mountains (TAM) to quantify the impact of SMB-driven loading on observed crustal motion. SMBL-induced deformation is found to introduce multiyear apparent changes in vertical velocities. After correcting for SMB loading\, most GPS sites exhibit near-zero uplift rates\, with a median velocity of 0.67 mm/yr\, substantially lower than predicted by forward GIA models. We will then discuss these results within the wider context of Antarctica to show the critical role of SMB loading variability in interpreting GPS observations more widely\, with implications for estimates of present-day Antarctic ice mass change. As a second case study\, we will discuss the sensitivity of GPS velocities to SMB variability in a critical sector of East Antarctica\, including in the Denman-Totten glacier region\, suggesting that bedrock motion in that region is broadly of subsidence rather than uplift in contrast to GIA models. Finally\, we will show that modelled SMB variability can be compared with GPS elastic displacements across Antarctica\, as a new form of SMB model validation.
URL:https://geodesy.science/event/talks-on-gia-seminar-6/
CATEGORIES:Commission 3,IACS
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Joint IAG-IACS Commission on Cryospheric Deformation (Sub-Commission 3.4)":MAILTO:matthias.willen@tu-dresden.de
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260603
DTEND;VALUE=DATE:20260606
DTSTAMP:20260218T063401Z
CREATED:20251013T094525Z
LAST-MODIFIED:20260218T063401Z
UID:30718-1780444800-1780703999@geodesy.science
SUMMARY:EU-wide Community Workshop on Quantum Gravimetry
DESCRIPTION:This in-person workshop is organized with the main objective to obtain feedback by the entire European community. Opinions\, comments and thoughts on EQUIP-G project activities will contribute to shaping key aspects on the future of (terrestrial) gravimetry. This is centered around the main long-term goal to establish a permanent perennial entity of a shared park of quantum gravimeters in Europe. \nThe workshop is addressed to all interested and relevant person from EU policymaker to European companies and geophysical service providers and different communities (geodesy\, quantum sensing\, metrology\, geosciences and defense). We want to underline that the focus area is Europe. \nParticipants will be informed not only about the project structure and goals but about finished\, ongoing and planned activities\, spanning the entire scope of the project. The workshop involves various formats (presentations\, panel discussions\, display area\, break-out activities and discussions). \nJoin\, be active and enjoy this workshop which is organized for all of us! \n\nEvent website and registration: https://events.spacepole.be/event/268/\nProject website: https://www.equip-g.eu/
URL:https://geodesy.science/event/eu-wide-community-workshop-on-quantum-gravimetry/
LOCATION:GFZ Helmholtz Centre for Geosciences\, Telegrafenberg\, Potsdam\, Germany
CATEGORIES:Commission 2,Projet QuGe
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/workshop_EQUIP-G_2026.jpg
ORGANIZER;CN="EQUIP-G":MAILTO:mreich@gfz.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20260513T160000
DTEND;TZID=Europe/Rome:20260513T160000
DTSTAMP:20260424T051509Z
CREATED:20260331T041839Z
LAST-MODIFIED:20260424T051509Z
UID:34873-1778688000-1778688000@geodesy.science
SUMMARY:Hydrologic Signature in Geodetic Observations
DESCRIPTION:We are pleased to announce our third seminar for our series\, hosted by the International Association of Geodesy (IAG) Working Group 3.1: Hydrologic Signature in Geodetic Observations\,  \nPresenter: Christian Massari – Research Institute for Geo-Hydrological Protection\, CNR\, Italy. \nTitle: Hydrologic variability in Europe and beyond as observed by satellites and in situ sensors \nThis seminar will be held on May 13 at 10:00 EDT/ 7:00 PDT/ 16:00 CET/ 23:00 CST. \nFurther details and the link will be posted at a later time. \nGrace Carlson and Carla Braitenberg
URL:https://geodesy.science/event/hydrologic-signature-in-geodetic-observations-2/
CATEGORIES:Commission 3
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Commission 3- Earth Rotation and Geodynamics. WG 3.1 Hydrologic signature in geodetic observations":MAILTO:berg@units.it
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20260512T170000
DTEND;TZID=UTC:20260512T180000
DTSTAMP:20260323T123504Z
CREATED:20260323T123504Z
LAST-MODIFIED:20260323T123504Z
UID:34662-1778605200-1778608800@geodesy.science
SUMMARY:Talks on GIA Seminar
DESCRIPTION:Allie Coonin (Brown University\, Providence\, USA) and Tamara Pico (University of California\, Santa Cruz\, USA) will present: \n“Transient Earth Rheology Temporarily Slows West Antarctic Ice Retreat in Future Climate Projections” \nProjections of sea-level change and Antarctic Ice Sheet (AIS) stability under anthropogenic climate change hinge upon accurately describing physical feedbacks that link ice dynamics (marine and terrestrial) with the gravitational\, rotational and deformational response of the solid Earth to ice and ocean loading changes. The marine-based West Antarctic Ice Sheet (WAIS) is vulnerable to runaway grounding line retreat. However\, the rapid viscoelastic rebound of the bedrock in response to ice retreat has been shown to stabilize its grounding line\, aided by the low-viscosity mantle beneath the WAIS. Such bedrock deformation is typically modelled with idealized Maxwell viscoelasticity\, despite that rock deformation experiments show that additional transient creep mechanisms occur over societally relevant (~decadal-centennial) timescales that are missing from the Maxwell model. We simulate future AIS evolution\, coupled with self-consistent solid Earth deformation and sea level change\, for various emissions scenarios (RCP 2.6\, 4.5\, 8.5)\, incorporating transient deformation. This more complete treatment of solid Earth deformation delays grounding line retreat as compared to Maxwell projections\, with differences of tens of kilometres persisting for decades at Pine Island and Thwaites Glaciers. While transient deformation is unable to prevent the bulk of sea-level rise over the next 500 years\, such considerations are crucial to predict the full Earth system response\, since AIS meltwater flux to the ocean affects the pace of global temperature rise.
URL:https://geodesy.science/event/talks-on-gia-seminar-5/
CATEGORIES:Commission 3,IACS
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Joint IAG-IACS Commission on Cryospheric Deformation (Sub-Commission 3.4)":MAILTO:matthias.willen@tu-dresden.de
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260428
DTEND;VALUE=DATE:20260501
DTSTAMP:20251006T084024Z
CREATED:20251006T083456Z
LAST-MODIFIED:20251006T084024Z
UID:30450-1777334400-1777593599@geodesy.science
SUMMARY:ENC2026 European Navigation Conference
DESCRIPTION: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. \nThe ENC-series is now widely acknowledged as the most important annual event in Europe bringing together the full positioning\, navigation and timing community. \nWhat you can expect at ENC2026: \n\nTechnical programme across three days with up to four parallel sessions;\nDaily keynote addresses in plenary\, bringing the community together;\nA 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;\nAn environment to gain insights\, grow your network and foster new collaborations.\n\nThe 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). \nThe 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. \nENC-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. \nWe warmly invite you to join us in Vienna. Please do prepare your abstract\, review our sponsorship opportunities and save the date to join us. \nThese 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. \nSee you at #ENC2026 in Vienna! \nhttps://enc-series.org/ \n  \n 
URL:https://geodesy.science/event/enc2026/
LOCATION:Austria Center Vienna\, Bruno-Kreisky-Platz 1\, Vienna\, 1220\, Austria
CATEGORIES:Commission 4,IGS,🌐 Other
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/ENC2026_logo_Copyright-ENC_2025-10-06_d36538.png
ORGANIZER;CN="ENC":MAILTO:s-mart@posteo.org
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Riga:20260415T090000
DTEND;TZID=Europe/Riga:20260415T190000
DTSTAMP:20260401T103853Z
CREATED:20260401T103853Z
LAST-MODIFIED:20260401T103853Z
UID:35159-1776243600-1776279600@geodesy.science
SUMMARY:International Scientific Conference
DESCRIPTION:This Scientific Conference is dedicated to the study of the Earth’s internal and external processes\, as well as their interaction with the space environment. It will cover research on the dynamics of the Earth’s crust and mantle\, tectonic processes\, seismicity\, variations in the gravitational and magnetic fields\, as well as the application of satellite observations and geodetic methods. The section brings together theoretical and applied studies\, promoting interdisciplinary collaboration among geophysics\, geology\, geodesy\, and space sciences. \nGeodynamucs_and_Geospatial_Research_Draft_Agenda \n 
URL:https://geodesy.science/event/international-scientific-conference/
LOCATION:University of Latvia\, House of Sciences\, Jelgavas str. 3\, Riga\, 1004\, Latvia
CATEGORIES:Commission 2,Commission 4,ICCC,IUGG
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260407
DTEND;VALUE=DATE:20260410
DTSTAMP:20260320T070747Z
CREATED:20251003T072122Z
LAST-MODIFIED:20260320T070747Z
UID:30385-1775520000-1775779199@geodesy.science
SUMMARY:PhHS-IHRF2026 - Int. Symposium on Physical Height Systems and the IHRF
DESCRIPTION:⚠️⚠️Given the recent evolving circumstances in the Middle East\, we would like to let you know that the IAG SC2.2\, SC2.4\, IGFS and GGOS Symposium “Physical Height Systems and the International Height Reference Frame – PhHS–IHRF2026” will be postponed to a future date. As the situation is quite uncertain\, no plans have been made yet\, hence we will keep you updated. Apologies for the last-minute change and any inconvenience this may cause to your schedule. ⚠️⚠️ \nThe 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). \nOfficial Symposium Website: https://geosa.gov.sa/en/Pages/phhs-ihrf-2026.aspx \n \nScientific Organizing Committee: \nGeorge Vergos (SC2.2 Chair\, IHRF CC director\, IGFS CB Director)\nRossen Grebenitcharsky (SC2.2 Vice-Chair)\nRiccardo Barzaghi (IGFS President)\nLaura Sanchez (GGOS President)\nHussein Abd-Elmotaal (SC2.4 Chair)\nRene Fordberg\nZuheir Altamimi  \nLocal Organizing Committee: \nAlShahrani Sultan Falah\nMohammed AlArjani\nMashael AlHarbi\nSaad AlQahtani\nAbdulmohsen AlDosari\nSaleh AlFaris\nEslam Abdulsamie
URL:https://geodesy.science/event/phys-ihrf2026/
LOCATION:General Authority for Survey and Geospatial Information (GEOSA)\, Riyadh\, Kingdom of Saudi Arabia
CATEGORIES:Commission 2,GGOS,IGFS
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/PHyS_logo-002.png
ORGANIZER;CN="IAG Commission 2%2C%2C SC2.2":MAILTO:sf.alshahrani@geosa.gov.sa
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20260401T160000
DTEND;TZID=Europe/Rome:20260401T170000
DTSTAMP:20260331T041343Z
CREATED:20260331T041343Z
LAST-MODIFIED:20260331T041343Z
UID:34871-1775059200-1775062800@geodesy.science
SUMMARY:Hydrologic Signature in Geodetic Observations
DESCRIPTION:Dear Colleagues\, \nWe are pleased to announce our second seminar for our series\, hosted by the International Association of Geodesy (IAG) Working Group 3.1: Hydrologic Signature in Geodetic Observations\, given by Wenjin Chen\, Assistant Professor at Jiangxi University of Science and Technology\, China. This seminar will be held on April 1 at 10:00 EDT/ 7:00 PDT/ 16:00 CET/ 23:00 CST. \nJoin the webinar:\nhttps://iu.zoom.us/j/82304710308\nMeeting ID: 823 0471 0308 \nTitle: Algorithms and Software for efficient Gravity forward modeling of hydrological mass changes \nAbstract: Gravimetric forward modeling is a fundamental tool in physical geodesy and gravimetric geophysics to model the gravitational potential and its derivatives from a prescribed subsurface density distribution. This paper presents a systematic review and unified formulation of forward modeling algorithms in Cartesian and spherical coordinate systems\, defined in both spatial and spectral domains. In the Cartesian coordinate framework\, analytical and numerical expressions are provided for a simple representation of volumetric mass elements that include point mass\, vertical line mass\, horizontal mass layer\, and prism as well as for more complex and generalized representations involving volumetric mass bodies bounded by variable upper and lower interfaces and volumetric mass bodies with arbitrary geometries and heterogeneous density distribution. In the spherical coordinates\, expressions are given for prism and tesseroid together with two spectral domain approaches involving tesseroid modeling combined with spherical harmonic analysis and concentric-shell method suited for arbitrary mass geometries. Numerical experiments\, based on using digital terrain model of Tibet and Himalaya\, demonstrate that compared to prism method\, simple point and line mass approaches reproduce only the long-wavelength gravity field\, with gravity differences typically up to about 12 mGal and gravity gradient discrepancies about 0.45 E\, whereas the horizontal layer method agrees with the prism gravity solution within ±0.01 mGal and approaches almost zero differences for gravity gradient solutions. Models with variable interfaces or full arbitrary geometries can deviate by 8 mGal in regions with extremely complex topography\, underscoring necessity of realistic geometric representation in high resolution applications. Spectral domain implementations in both Cartesian and spherical coordinates substantially reduce computational time when compared with direct spatial integration techniques\, while preserving numerical accuracy that is effectively indistinguishable from spatial domain algorithms at regional scales. These results highlight the trade-offs between geometric realism\, accuracy\, and computational efficiency\, and provide practical guidance for selecting suitable forward modeling strategies in numerical studies. Finally\, we present several examples of hydrological mass changes derived from gravity forward modeling.
URL:https://geodesy.science/event/hydrologic-signature-in-geodetic-observations/
CATEGORIES:Commission 3
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Commission 3- Earth Rotation and Geodynamics. WG 3.1 Hydrologic signature in geodetic observations%2C WG3.1":MAILTO:berg@units.it
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260316
DTEND;VALUE=DATE:20260321
DTSTAMP:20251120T101331Z
CREATED:20251106T061830Z
LAST-MODIFIED:20251120T101331Z
UID:31681-1773619200-1774051199@geodesy.science
SUMMARY:EPOS days 2026
DESCRIPTION:EPOS Days is the flagship annual conference of the European Plate Observing System (EPOS)\, bringing together researchers\, data providers\, and infrastructure developers from across Europe to advance collaboration in solid Earth science. The event serves as a key forum to discuss the evolution of EPOS as a pan-European research infrastructure and to showcase progress in data interoperability\, FAIR principles\, and service integration across the various Thematic Core Services (TCS). \nThe programme combines plenary talks\, thematic sessions\, and interactive discussions covering: \n\nintroductions to EPOS and its services for newcomers and partners;\nupdates from the different TCS communities\, including geodesy\, seismology\, volcanology\, and geomagnetism;\nsessions on technical challenges\, data policy\, and ICS–TCS integration;\ndiscussions on responsible and societal use of research infrastructures;\ninternational collaboration and national implementation showcases;\nnetworking opportunities such as poster sessions and a dedicated Early Career Researchers event.\n\nOverall\, EPOS Days provides a dynamic platform to exchange knowledge\, align technical developments\, and strengthen the community working towards a FAIR\, open\, and sustainable EPOS infrastructure for solid Earth science in Europe.
URL:https://geodesy.science/event/epos-days-2026/
LOCATION:Palazzo Doglio hotel conference centre\, Cagliary\, Italy
CATEGORIES:Commission 3,IAGA,IASPEI,IAVCEI,IGETS,IGS,🌐 Other,📚 Education & Training
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/EPOSdays_26_A3_DEF_blu_Copyright-EPOSERIC_2025-11-05_721b62.jpg
ORGANIZER;CN="EPOS ERIC":MAILTO:communication@epos-eric.eu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20260311T160000
DTEND;TZID=Europe/Rome:20260311T170000
DTSTAMP:20260309T125919Z
CREATED:20260309T125919Z
LAST-MODIFIED:20260309T125919Z
UID:34064-1773244800-1773248400@geodesy.science
SUMMARY:Tracking Mountain Aquifer using Space Geodesy
DESCRIPTION:Dear Colleagues\,\n\nWe are pleased to announce our first seminar for our series\, hosted by the International Association of Geodesy (IAG) Working Group 3.1: Hydrologic Signature in Geodetic Observations\, will be given by Matthew Swarr\, from the University of Montana.  This seminar wil be held at 11:00 EDT/ 8:00 PDT/ 16:00 CET/ 23:00 CST.\n\nJoin the webinar:  \nhttps://iu.zoom.us/j/82295302430\nMeeting ID: 822 9530 2430\n\nTitle: Tracking Mountain Aquifer Storage and Discharge Using Space Geodesy\nAbstract: Fractured bedrock underlying mountain ranges is a critical source of water for mountain and adjacent low-elevation communities and ecosystems. Despite the importance of mountain groundwater systems to water supplies of major socioeconomic regions\, quantifying storage changes within these aquifers remains a challenge. To evaluate the fate of water stored in mountain systems and the role of extreme precipitation events\, such as atmospheric rivers\, in replenishing groundwater storage\, we use high-precision Global Navigation Satellite Systems (GNSS) surface displacements to constrain changes in groundwater storage within the Sierra Nevada and Cascade mountain ranges\, two important mountainous regions of the Western United States. We find that mountain aquifers have been significantly depleted over the past two decades\, associated with recurrent severe multi-year droughts within these regions. However\, extremely wet winters\, can replenish storage by more than twice the average annual flux over relatively short periods\, driving the state of groundwater storage from historical lows to above normal conditions. Further\, we find GNSS derived groundwater storage changes are strongly correlated with observed groundwater head from wells. These findings show that periods of extreme precipitation rapidly recharge mountain aquifer systems and can offset multi-year losses. Moreover\, mountain aquifer systems can retain storage gains for several years post-event\, providing a durable source of streamflow\, agricultural\, and municipal water supply. As extreme precipitation events are predicted to become more intense and frequent in coming years\, we hypothesize that these events may help offset groundwater loss due to aridification\, sustaining ecosystems and buffering against a new\, drier climate normal. Additionally\, we provide insights on a newly developed method to constrain the hydraulic properties of mountain groundwater systems at the mountain range-scale using fluid diffusion models in combination with our GNSS-inferred estimates of groundwater storage. Our results indicate the effective hydraulic conductivity of the bedrock within the Sierra Nevada and Cascades is an order of magnitude higher than previous findings\, and we find consistency between our estimates of the average groundwater flow path length within the Sierra Nevada and Cascades and those derived from perennial and intermittent and perennial stream networks\, respectively\, indicating the Cascades to be a recharge dominated groundwater system with increased regional groundwater flow compared to the Sierra Nevada. These results further the current understanding of the storage and release properties of mountain groundwater systems as well as highlighting the use of geodetic observations in advancing groundwater hydrology.\n\n\nCarla Braitenberg and Grace Carlson\n\nGrace Carlson\nshe/ her\nDepartment of Geography\nIndiana University\n\n\nCarla Braitenberg\nDepartment of Mathematics\, Informatics and Geosciences\nUniversity of Trieste
URL:https://geodesy.science/event/tracking-mountain-aquifer-using-space-geodesy/
CATEGORIES:Commission 3
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Commission 3- Earth Rotation and Geodynamics. WG 3.1 Hydrologic signature in geodetic observations":MAILTO:berg@units.it
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Australia/Sydney:20260305T070000
DTEND;TZID=Australia/Sydney:20260305T080000
DTSTAMP:20260218T140956Z
CREATED:20260218T140956Z
LAST-MODIFIED:20260218T140956Z
UID:33158-1772694000-1772697600@geodesy.science
SUMMARY:Talks on GIA Seminar
DESCRIPTION:Paul Tregoning (Australian National University\, Canberra\, Australia)\, will present \n“A tool to assess the accuracy of glacial isostatic adjustment predictions of present-day crustal uplift rates” \nWhile there are many global and regional glacial isostatic adjustment (GIA) models available that can be used to compute expected present-day uplift rates of the surface of the Earth\, they do not always agree in their predictions. Obtaining accurate estimates of uncertainties in predictions is difficult due to the assumptions that must be made when constructing the GIA models\, and geodetic users often simply adopt a preferred model or assign uncertanties based on the spread of values derived from several models. Here we show that\, through a combination of gravity changes observed by GRACE/GRACE-FO and uplift observed by GNSS\, it is possible to quantify the error in uplift rates of one or more GIA models. Whilst it is not possible to repair the GIA models directly\, this tool can be used to identify regions where ice histories and/or Earth rheology parameters are deficient in the GIA models. In this talk I will give examples of locations where GIA modelling appears to be very accurate as well as indicate some locations that are clearly problematic.
URL:https://geodesy.science/event/talks-on-gia-seminar-4/
CATEGORIES:Commission 3,IACS
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="Joint IAG-IACS Commission on Cryospheric Deformation (Sub-Commission 3.4)":MAILTO:matthias.willen@tu-dresden.de
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260302
DTEND;VALUE=DATE:20260307
DTSTAMP:20250616T062856Z
CREATED:20250224T071838Z
LAST-MODIFIED:20250616T062856Z
UID:25563-1772409600-1772841599@geodesy.science
SUMMARY:Munich 2026 | REFAG Symposium + Unified Analysis Workshop UAW
DESCRIPTION: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: \n\nThe IAG International Symposium on Reference Frames for Applications in Geosciences (REFAG2026)\, 2–4 March 2026\, and\nThe joint GGOS/IERS (International Earth Rotation and Reference Systems Service) Unified Analysis Workshop (UAW2026)\, 5–6 March 2026\n\nThese events will bring together leading experts\, researchers\, and institutions to shape the future of global geodesy — right here at TUM in Munich\, Germany. \nPlease find more information here…
URL:https://geodesy.science/event/munich2026/
LOCATION:LDBV – Landesamt für Digitalisierung\, Breitband und Vermessung\, Alexandrastraße 4\, Munich\, 80538\, Germany
CATEGORIES:Commission 1,GGOS,IAG Services,IERS
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/munichArtLandscape1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Lisbon:20260223T090000
DTEND;TZID=Europe/Lisbon:20260223T100000
DTSTAMP:20260122T085759Z
CREATED:20260122T085759Z
LAST-MODIFIED:20260122T085759Z
UID:32771-1771837200-1771840800@geodesy.science
SUMMARY:GNSS-EPOS Webinar\, with Dr. Marianne Métois
DESCRIPTION:We are pleased to invite the GNSS-EPOS community to the inaugural session of our 2026 webinar series\, featuring guest speaker Dr. Marianne Métois from the Laboratoire de Géologie de Lyon. \nPresentation Title:\n\n“Tracking very slow deformation of continental Europe with GNSS: challenges and perspectives” \n\nEvent Details:\n\n\nDate: Monday\, 23rd February 2026 \n\n\nTime: 10:00 – 11:00 CET \n\n\nPlatform: Microsoft Teams \n\nRegistration: CLICK FOR REGISTRATION
URL:https://geodesy.science/event/gnss-epos-webinar-with-dr-marianne-metois/
CATEGORIES:Commission 3
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/GNSS-EPOS_2026_Webinar_Copyright-EPOSTCSGNSS_2026-01-21_e34d8d.png
ORGANIZER;CN="EPOS TCS GNSS":MAILTO:communication@gnss-epos.eu
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Stockholm:20260203T170000
DTEND;TZID=Europe/Stockholm:20260203T180000
DTSTAMP:20251210T083323Z
CREATED:20251210T083323Z
LAST-MODIFIED:20251210T083323Z
UID:32255-1770138000-1770141600@geodesy.science
SUMMARY:“Talks on GIA” seminar 3
DESCRIPTION:Mirjam Bilker-Koivula (Finnish Geospatial Research Institute) and Holger Steffen (Lantmäteriet\, Sweden)\, will present \n“The Whys and Hows of Dealing with Glacial Isostatic Adjustment in a Mapping Authority” \nGlacial isostatic adjustment (GIA) affects among others vertical datums\, sea-level measurements\, GNSS heights\, and crustal motion models. Hence\, it creates technical and practical challenges for mapping agencies. They have to address them in their daily work by updating geodetic reference frames\, modeling vertical land motion\, adjusting elevation datasets\, communicating changes to users\, maintaining long-term stability of coordinates and more. We will present some examples how two authorities\, Lantmäteriet in Sweden and the Finnish Geospatial Research Institute (FGI)\, handle GIA. We will focus on deformation and gravity change\, but also provide snapshots of Lantmäteriet’s communication efforts and FGI’s GIA-related investigations in Antarctica.
URL:https://geodesy.science/event/talks-on-gia-seminar-3/
CATEGORIES:Commission 3
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="IAG/IACS subcommission 3.4 %E2%80%9CCryospheric Deformation%E2%80%9D":MAILTO:matthias.willen@tu-dresden.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=UTC:20251205T150000
DTEND;TZID=UTC:20251205T160000
DTSTAMP:20251114T090917Z
CREATED:20251114T090917Z
LAST-MODIFIED:20251114T090917Z
UID:31775-1764946800-1764950400@geodesy.science
SUMMARY:“Talks on GIA” seminar
DESCRIPTION:Helio Guerra Neto and Jeff Freymueller from Michigan State University\, East Lansing\, USA\, will present \n“GIA in the Great Lakes Basin: A Geodetic Perspective on Vertical Motion and Hydrological Loading” \nVertical crustal motion in the Great Lakes Basin\, North America\, results from a combination of ongoing Glacial Isostatic Adjustment (GIA) and environmental and hydrological loadings. The hinge line for present-day vertical motion from GIA passes through the region\, and the last 15 years have featured significant rise and then fall of the water levels in the Great Lakes. The region is also densely instrumented with continuous GNSS sites\, due to extensive networks operated by US states. We are involved in a project with the goal of constraining groundwater changes in the region\, and to make those measurements we need to remove the GIA signal accurately. In this presentation\, we will discuss recent advances in our project\, using GNSS time series to quantify vertical land motion across the basin\, emphasizing the challenges of distinguishing long-term uplift signals (GIA) from the elastic responses to local mass variations.\nWe identify three distinct periods with very different patterns of local mass variations. Before 2012\, the water levels in the Great Lakes were stable\, and GRACE data suggest minimal total water changes across the region; this time interval should thus feature motions entirely due to GIA. From 2012-2019\, water levels in the Lakes rose to record highs\, and since 2020 the water levels have been falling at a similar rate. We thus examine the velocities in map view and along profiles roughly normal to the ice front.\nWe have compared the predictions of a large number of GIA models (mainly variations in the Earth models) with the pre-2012 observations\, which should be due entirely to GIA. We find that none of the GIA models adequately predict the observed data\, and models fail systematically: they all predict the hinge line to be located too far south. When viewed along a profile normal to the ice front\, our data look very much like a GIA model curve. We thus experimented with an empirical correction in which we shift the GIA model predictions laterally and identify a suite of models that predict profiles with the same shape as the data. The model predictions need to be shifted northward to northeastward\, which would likely mean that an ice model with less ice near the southern ice front in the Great Lakes region would fit the data better.
URL:https://geodesy.science/event/talks-on-gia-seminar-2/
CATEGORIES:Commission 3
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
ORGANIZER;CN="IAG/IACS subcommission 3.4 %E2%80%9CCryospheric Deformation%E2%80%9D":MAILTO:matthias.willen@tu-dresden.de
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20251106T170000
DTEND;TZID=Europe/Berlin:20251106T180000
DTSTAMP:20251022T060719Z
CREATED:20251013T094703Z
LAST-MODIFIED:20251022T060719Z
UID:30586-1762448400-1762452000@geodesy.science
SUMMARY:"Talks on GIA" seminar
DESCRIPTION:“Talks on GIA” seminar – Constraining GIA where the mantle is heterogeneous AND Community Priorities for GNSS Measurements\nWe will have two presentations. \n\nErica Lucas (University of California\, Santa Cruz\, USA) will present “Constraining Glacial Isostatic Adjustment where the mantle is heterogeneous”.\nTerry Wilson (Ohio State University\, Columbus\, USA) will present “Community Priorities for GNSS Measurements to Constrain GIA – Results of a Survey”\n\n“Constraining Glacial Isostatic Adjustment where the mantle is heterogeneous”\nTo 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. \n“Community Priorities for GNSS Measurements to Constrain GIA – Results of a Survey”\nA 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.
URL:https://geodesy.science/event/talks-on-gia-seminar/
CATEGORIES:Commission 3,📚 Education & Training
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251027
DTEND;VALUE=DATE:20251102
DTSTAMP:20250910T045813Z
CREATED:20250910T045813Z
LAST-MODIFIED:20250910T045813Z
UID:29387-1761523200-1762041599@geodesy.science
SUMMARY:XVI SIRGAS School “VLBI and SLR Data Processing”
DESCRIPTION: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. \nThe 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. \n 
URL:https://geodesy.science/event/xvi-sirgas-school-vlbi-slr/
LOCATION:Facultad de Ingeniería – Universidad Nacional de San Juan\, Av. Libertador Gral. San Martín 1109\, J5400ARL San Juan\, Argentina\, San Juan\, Argentina
CATEGORIES:Commission 1,📚 Education & Training
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/INGLES-1-1536x1536_Copyright-SIRGAS_2025-09-08.png
ORGANIZER;CN="SIRGAS":MAILTO:sirgasipgh@gmail.com
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20251007
DTEND;VALUE=DATE:20251010
DTSTAMP:20250423T103118Z
CREATED:20250423T103118Z
LAST-MODIFIED:20250423T103118Z
UID:27280-1759795200-1760054399@geodesy.science
SUMMARY:GRACE-FO Science Team Meeting 2025
DESCRIPTION: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). \nEvent Category: igfs
URL:https://geodesy.science/event/grace-fo-science-team-meeting-2025/
LOCATION:University of Colorado\, Boulder\, Boulder\, USA
CATEGORIES:Commission 2,IGFS
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/event-meeting_AdobeStock_4746141881-scaled.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20250929
DTEND;VALUE=DATE:20251004
DTSTAMP:20251001T114115Z
CREATED:20250915T140010Z
LAST-MODIFIED:20251001T114115Z
UID:29440-1759104000-1759535999@geodesy.science
SUMMARY:GRACE Hackweek 5
DESCRIPTION:An online school on time-variable gravity from GRACE and GRACE-FO satellite missions\nSatellite 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. \nThe 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. \nThe 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). \nRegistration: https://forms.office.com/r/WzP7GdBbwk \nMore Info: GRACE Hackweek 5 – Program \n  \nOrganizing Committee: \nProf. Balaji Devaraju (IIT Kanpur\, India); Prof. Nico Sneeuw (Uni. Stuttgart\, Germany); Prof. Matthias Weigelt (Leibniz Uni. Hannover\, Germany)
URL:https://geodesy.science/event/grace-hackweek-5/
CATEGORIES:Commission 2,ECS,📚 Education & Training
ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/GRACE_NASA__1__Copyright-aei.mpg.de_2025-09-15.png
ORGANIZER;CN="Balaji Devaraju":MAILTO:dbalaji@iitk.ac.in
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20250826
DTEND;VALUE=DATE:20250829
DTSTAMP:20250801T084609Z
CREATED:20250401T102318Z
LAST-MODIFIED:20250801T084609Z
UID:26549-1756166400-1756425599@geodesy.science
SUMMARY:Summer School on "Satellite-based Hydrological Data Assimilation"
DESCRIPTION:We are thrilled to announce the upcoming Summer School on “Satellite-based Hydrological Data Assimilation”\, specifically designed for early career scientists (MSc\, PhD\, and Postdoctoral researchers). This exciting event will be hosted by the Geodesy Group at Aalborg University\, Denmark\, from August 26th to 28th\, 2025. \nWhy Attend? Dive into advanced techniques and tackle open challenges in measuring\, modeling\, and predicting water cycle variability. Learn how to leverage Satellite Gravity (GRACE/GRACE-FO)\, Satellite Altimetry (Sentinel and SWOT)\, and Soil Remote Sensing (e.g.\, SMOS and SMAP) to enhance large-scale hydrological models through Data Assimilation. Participants will gain hands-on experience with ensemble-based sequential Data Assimilation techniques\, and merging satellite data with models. \nWhat to Expect? \n\nInteractive Learning: Engage in practical exercises using Matlab/Octave and Python.\nHands-on Activities: Explore the data assimilation package (PyGLDA) and the GRACE-FO post-processing package SaGEA through practical exercises.\nExpert Lectures: Learn from world-leading scientists\, including Dr. Henrik Madsen (DHI)\, Professor Peter Bauer-Gottwein (University of Copenhagen)\, Professor Petra Döll (University of Frankfurt)\, Professor Jürgen Kusche (University of Bonn)\, Professor Gabriëlle De Lannoy (KU Leuven)\, Dr. Anke Fluhrer (German Aerospace Center\, DLR)\, Dr. Guillaume Rmillien (French National Centre for Scientific Research\, CNRS)\, Professor Mohammad Shamsudduha (University College London)\, and Professor Maike Schumacher (Aalborg University).\n\nRegistration Details: \n\nCost: Free registration!\nDeadline: End of April 2025\nLocation: Geodesy Group\, Aalborg University\, Aalborg\, Denmark\nTime: August 26-28\, 2025\n\nFor more information\, the program\, and the registration form\, please visit: Summer School Information https://www.plan.aau.dk/summer-school-satellite-based-hydrological-data-assimilation-e134157 \nEvent Category: igfs
URL:https://geodesy.science/event/summer-school-on-satellite-based-hydrological-data-assimilation/
LOCATION:Aalborg University\, Aalborg\, Denmark
CATEGORIES:Commission 2,ECS,IGFS,📚 Education & Training
ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/AdobeStock_236598424_landscape.jpeg
END:VEVENT
END:VCALENDAR