This open access volume contains 46 selected papers from the symposia organised or co-organised by the International Association of Geodesy (IAG) in the framework of the 28th General Assembly of the International Union of Geodesy and Geophysics (IUGG). The conference was held in Berlin, Germany, from 11 to 20 July under the theme "Together again in the geosciences". It marked a return to face-to-face meetings after the pandemic restrictions. A total of 4,884 participants from 100 countries attended, of whom 607 registered for the IAG. The Assembly featured a total of 3,200 oral presentations and 1,300 poster presentations, of which 661 were related to the IAG.