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DTSTART;TZID=Europe/Rome:20260401T160000
DTEND;TZID=Europe/Rome:20260401T170000
DTSTAMP:20260526T214211
CREATED:20260331T041343Z
LAST-MODIFIED:20260331T041343Z
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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
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20260407
DTEND;VALUE=DATE:20260410
DTSTAMP:20260526T214211
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;VALUE=DATE:20260412
DTEND;VALUE=DATE:20260418
DTSTAMP:20260526T214211
CREATED:20251202T050536Z
LAST-MODIFIED:20260209T144150Z
UID:32210-1775952000-1776470399@geodesy.science
SUMMARY:14th IVS General Meeting 2026
DESCRIPTION:The 14th General Meeting of the International VLBI Service for Geodesy and Astrometry (IVS) is the biennial general assembly of the geodetic/astrometric VLBI community. All IVS Associate Members and individuals who have interests in the application of VLBI in the fields of geodesy\, Earth sciences\, astrometry\, and other astronomical applications in geodesy are invited to attend the meeting. The meeting will be held under the theme “Linking the Celestial and Terrestrial Realms.”
URL:https://geodesy.science/event/14th-ivs-general-meeting/
LOCATION:Congress House\, Garmisch-Partenkirchen\, Germany
CATEGORIES:IVS
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BEGIN:VEVENT
DTSTART;TZID=Europe/Riga:20260415T090000
DTEND;TZID=Europe/Riga:20260415T190000
DTSTAMP:20260526T214211
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
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END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20260428
DTEND;VALUE=DATE:20260501
DTSTAMP:20260526T214211
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
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ORGANIZER;CN="ENC":MAILTO:s-mart@posteo.org
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