Sub-Commission 1.3 - Regional Reference Frames Regional Sub-Commission 1.3c - North America www.naref.org

Terms of Reference

Purpose

The purpose of this regional sub-commission is to provide international focus and cooperation for issues involving the horizontal, vertical, and three-dimensional geodetic control networks of North America, including Central America, the Caribbean and Greenland (Denmark). Some of these issues include:

• Densification of the ITRF reference frame network in North America and promotion of its use
• Maintenance and future evolution of vertical datums (ellipsoidal and orthometric), including NAVD88 and the International Great Lakes Datum
• Collocation of different measurement techniques such as VLBI, SLR, DORIS, GPS, etc.
• Effects of crustal motion, including tectonic motions along, e.g., the western coast of N.A. and in the Caribbean, and post-glacial rebound
• Standards for the accuracy of geodetic positions
• Outreach to the general public through focused symposia, articles, workshops and lectures and technology transfer to other groups, particularly in N.A.

Structure

The membership of this regional sub-commission shall consist of:

• One representative from each country within North American and the Caribbean
• Chairpersons of each working group (WG) in this regional sub-commission
• Sub-Commission 1.3 national representatives from countries covered by this regional sub-commission will be de facto members

The regional sub-commission will create working groups (WG) as necessary to address specific issues. The terms of reference and Chairperson of each WG will be established by the regional sub-commission. The Chairperson of each WG will recruit further members as required.

Members

Working Groups

• SC1.3c-WG1: North American Reference Frame (NAREF)
• SC1.3c-WG22: Plate-Fixed North American Reference Frame
• SC1.3c-WG33: Reference Frame Transformations