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

SC1.3c-WG3
Reference Frame Transformations in North America
Working Group

The purpose of this working group is to determine consistent relationships between international, regional and national reference frames/datums in North America, to maintain (update) these relationships as needed and to provide tools for implementing these relationships.

Members

ITRF-NAD83 Transformation

• Making Sense of Evolving Reference Frames for North America (Craymer & Sella, 2007)
• The Evolution of NAD83 in Canada (Craymer, 2006)
• Making Sense of Evolving Datums: WGS84 and NAD83 (Craymer, 2006)
• ITRF-NAD83 Transformation and Definition of NAD83(CSRS) (Craymer, 2001)
• Realization and Unification of NAD83 in Canada and the US via the ITRF (Craymer et al, 1999)
• A Compendium of Transformation Formulas Useful for GPS Work (Soler, 1998; 239 KB). The original publication is available on Springer LINK at http://link.springer.de.
• U.S. National Geodetic Survey Coordiante Transformations. Summary of transformations between various ITRF realizations and NAD83/NSRS (same as NAD83/CSRS). Only the transformations since ITRF94 are the same as those used in Canada.

ITRF Transfromations & IERS Convensions

• ITRF Transformation Parameters. Official IERS transformation parameters between ITRF reference frames.
• ITRF2000-ITRF2005 transformation
• IERS Convensions. Official definitions of celestial and terrestrial reference frames and adopted models, constraints and standards.
  • IERS Conventions 1996
  • IERS Conventions 2003

IGS Reference Frame Transformations

• Transformation between IGb00 and IGS05 [IGSMAIL-5447]
• Transformation between IGS97 and IGS00 [IGSMAIL-3605]
• Transformation between IGS96 and IGS97 [IGSMAIL-2432]

Transformation Software

• TRX
  TRX is an online coordinate transformation tool from the Canadian Geodetic Survey that combines and replaces GSRUG and TRNOBS. The tool allows for transformation between NAD83 (CSRS) and ITRF realizations as well as transformations between geographic, cartesian and local projections systems (UTM, MTM, custom projections and stereographic). A Windows desktop version is also available.

• HTDP (Horizontal Time Dependent Positioning)
  Software from the US National Geodetic Survey that, among other things, can be used to transform between NAD83 and ITRF.
  • On-Line Version
  • Software Description & Archive