Hermann Drewes Livres

Geodetic reference frames underpin three-dimensional, time-dependent positioning across global, regional, and national networks, including cadastre, engineering, navigation, and geosciences. The Symposium's program, organized by the Sub-commissions, Projects, and Study Groups of Commission 1, focused on eight key themes: 1. Combination of space techniques, 2. Global reference frames, 3. Regional reference frames, 4. Interaction of terrestrial and celestial frames, 5. Vertical reference frames, 6. Ionosphere modeling and analysis, 7. Satellite altimetry, and 8. Use of GNSS for reference frames. Established in 2003, Commission 1 “Reference Frames” of the International Association of Geodesy (IAG) aims to address fundamental scientific challenges related to reference frame establishment. A day of the Symposium featured a joint meeting with the International Congress of the Fédération Internationale des Géomètres (FIG) and the INTERGEO congress of the German Association of Surveying, Geo-information, and Land Management. The contributions from this meeting are included in the proceedings, emphasizing the Commission's objectives of defining, establishing, maintaining, and improving geodetic reference frames, as well as advancing terrestrial and space observation techniques.

The Symposium on Vertical Reference Systems (VeReS) was initiated during the XXII General Assembly of the International Union of Geodesy and Geophysics (IUGG) in Birmingham, 1999, by Professor Dr. Wolfgang Torge, a former president of the International Association of Geodesy (IAG). The symposium aimed to replicate the success of a previous joint event held in Vienna in 1991, motivated by the ongoing efforts of the SIRGAS Project, which has been active since 1993 and focuses on the South American Geocentric Reference System. This project successfully established a continental reference frame of 58 stations, which was presented at the IAG Scientific Assembly in Rio de Janeiro in 1997 and has been adopted by several South American countries for their national horizontal geodetic datums. To address the challenges posed by differing vertical datums among countries, SIRGAS formed its Working Group III, "Vertical Datum," in 1997. Given the ongoing discussions about unifying vertical reference systems within IAG and other scientific communities, the symposium was dedicated to this important topic.

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