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

• TRNOBS
  Software from Geodetic Survey Division to transform between NAD83(CSRS) and various ITRF reference frames.
  • On-Line Version
  • Software archive
    • Description of files (README.TXT)
    • Program documentation (trnobs.txt)

• 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