National Geodetic Survey, U.S. National Oceanic and Atmospheric Administration

• Main Authors: Michael R. Craymer, Dennis Milbert, North American Reference Frame (naref
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Reference Frame Transformations; Greenland
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.579.3204; http://www.naref.org/naref/naref_iag2001report.pdf

www.naref.org Operating on a informal basis since 1997, the Sub-Commission for North America was formally created in 1999, immediately following the IUGG General Meeting in Birmingham, U.K. The purpose of the 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 (the North American Reference Frame) 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. The membership of the Sub-Commission presently consists of: