The contribution of GPS processing and analysis at Geoscience Australia to enhancing the Spatial Infrastructure in Australia
The National Geospatial Reference Systems (NGRS) Project at Geoscience Australia (and its predecessors) has actively participated in precision processing and analysis of GPS data for geodetic purposes for more than 20 years. This group took a lead role in managing and coordinating the GPS observation campaigns and processing of the data set establishing the GDA94 datum for Australia. Following the establishment of the Australian Regional GPS Network (ARGN) this group was appointed by the International GNSS Service (IGS) as a Regional Network Associate Analysis Centre (RNAAC) contributing weekly GPS solutions of the ARGN to the IGS products centre. This role continues and contributes to enhanced long term monitoring of the GDA94 datum. The AUSPOS on-line GPS processing service was officially released for use on 11th November 2000. This service enables users with a dual frequency GPS receiver to submit post survey their observed data via the internet for processing through an automated service that delivers GDA94 coordinates on the occupied site in the Australian region. The NGRS Project will continue to maintain appointment as a Verifying Authority for Position under the National Measurement Act and upon request can provide a verification service and issue certificates demonstrating legal traceability of GDA94 coordinates on GPS CORS sites. This presentation will inform the audience about enhancements to these services underpinning the maintenance of the spatial reference frame in Australia to satisfy industry demands for ever increasing accuracies and connection to the International terrestrial reference Frame (ITRF).