The accuracy of Australia's geodetic network

Australia's network of well‐established geodetic survey marks is the essential basis for the country's spatial data infrastructure. Until recently the precision of these positions was only really understood in a relative sense and was generally represented by an Order (1^st order, 2^nd order, etc). In 2000 the Inter‐governmental Committee on Surveying and Mapping (ICSM), adopted Positional Uncertainty as a simple method of indicating coordinate accuracy for all types of users

This paper briefly documents the process used in the GDA94 national adjustment and describes in more detail the calculation of the Positional Uncertainty. It presents the results and independently checks them against positions from Geoscience Australia's on‐line GPS processing system (AUSPos).