1 GGOS Working Group on Ground Networks and Communications

Abstract. Properly designed and structured ground-based geodetic networks materialize the reference systems to support sub-mm global change measurements over space, time and evolv-ing technologies. Over this past year, the Ground Networks and Communications Working Group (GN&C WG) has been organized under the Global Geodetic Observing System (GGOS) to work with the IAG measurement services (the IGS, ILRS, IVS, IDS and IGFS) to develop a 2 strategy for building, integrating, and maintaining the fundamental network of instruments and sup-porting infrastructure in a sustainable way to sat-isfy the long-term (10-20 year) requirement