International Terrestrial Reference Frame

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The Global Positioning System (WGS84) has been refined on several occasions since its inception and is now aligned with the International Terrestrial Reference Frame (ITRF) at the level of a few centimetres. For most people it is impossible to obtain a WGS84 position with an accuracy of better than a few metres, but it is now relatively easy to obtain ITRF positions with an accuracy of a few centimetres. (See AUSPOS - our free global GPS processing service). If accurate WGS84 positions are required, it is best to use ITRF positions.

Topic contact: geodesy@ga.gov.au Last updated: May 8, 2013