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This open access book contains 30 peer-reviewed papers based on presentations at the 27th General Assembly of the International Union of Geodesy and Geophysics (IUGG). The meeting was held from July 8 to 18, 2019 in Montreal, Canada, with the theme being the celebration of the centennial of the establishment of the IUGG. The centennial was also a good opportunity to look forward to the next century, as reflected in the title of this volume. The papers in this volume represent a cross-section of present activity in geodesy, and highlight the future directions in the field as we begin the second century of the IUGG. During the meeting, the International Association of Geodesy (IAG) organized one Union Symposium, 6 IAG Symposia, 7 Joint Symposia with other associations, and 20 business meetings. In addition, IAG co-sponsored 8 Union Symposia and 15 Joint Symposia. In total, 3952 participants registered, 437 of them with IAG priority. In total, there were 234 symposia and 18 Workshops with 4580 presentations, of which 469 were in IAG-associated symposia. .

Geology. --- Geotechnical engineering. --- Geographic information systems. --- Geotechnical Engineering and Applied Earth Sciences. --- Geographical Information System. --- Geographical information systems --- GIS (Information systems) --- Information storage and retrieval systems --- Engineering, Geotechnical --- Geotechnics --- Geotechnology --- Engineering geology --- Geognosy --- Geoscience --- Earth sciences --- Natural history --- Geography --- Earthquakes and Geodynamics --- Global Geodetic Observing System --- Height Reference Systems --- Mass transport and time-variable gravity --- Positioning techniques and applications --- Reference Frames --- Static Gravity Field of the Earth --- Remote Sensing/Photogrammetry

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This open access volume contains selected papers of the 2021 Scientific Assembly of the International Association of Geodesy – IAG2021. The Assembly was hosted by the Chinese Society for Geodesy, Photogrammetry and Cartography (CSGPC) in Beijing, China from June 28 to July 2, 2021. It was a hybrid conference with in-person and online attendants. In total, the Assembly was attended by 146 in-person participants and 1,123 online participants. The theme of the Assembly was Geodesy for a Sustainable Earth. 613 contributions (255 oral presentations and 358 poster presentations) covered all topics of the broad spectrum considered by the IAG: geodetic reference frames, Earth gravity field modelling, Earth rotation and geodynamics, positioning and applications, the Global Geodetic Observing System (GGOS), geodesy for climate research, marine geodesy, and novel sensors and quantum technology for geodesy. All published papers were peer-reviewed, and we warmly recognize the contributions and support of the Associate Editors and Reviewers. .

Geophysics. --- Geotechnical engineering. --- Geographic information systems. --- Geotechnical Engineering and Applied Earth Sciences. --- Geographical Information System. --- Geographical information systems --- GIS (Information systems) --- Information storage and retrieval systems --- Engineering, Geotechnical --- Geotechnics --- Geotechnology --- Engineering geology --- Geological physics --- Terrestrial physics --- Earth sciences --- Physics --- Geography

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