President: Zuheir Altamimi (France)

Sub-Commission 1.3 is concerned with definitions and realizations of regional reference frames and their connection to (and the densification of) the global International Terrestrial Reference Frame (ITRF). It offers a home for service-like activities addressing theoretical and technical key common issues of interest to regional organisations.

Objectives and Program Activities

	SC1.3a Europe (EUREF) Chair: João Agria Torres (Portugal)
	SC1.3b South and Central America (SIRGAS) Chair : Luiz Paulo FORTES (Brazil)
	SC1.3c North America (NAREF) Co-Chairs: Michael Craymer (Canada), Richard Snay (USA)
	SC1.3d Africa (AFREF) Chair: Richard Wonnacott
	SC1.3e South-East Asia and Pacific Chair: John Manning (Australia)
	SC1.3f Antarctica (SCAR) Chair: Reinhard Dietrich (Germany)

SC1.3-WG1: Inter-regional Technical Working Group

The main task of this WG is to develop harmonized and possibly common specifications for the regional reference frames implementation and ITRF densification.

The regional reference frame activities are tied into the various IAG services through provision of data from individual sites to:

	International Earth Rotation and Reference Systems Service (IERS)
	International GPS Service (IGS)
	International Laser Ranging Service (ILRS)
	International VLBI Service for Geodesy and Astrometry (IVS)
	International DORIS Service (IDS)