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  • The Asia-Pacific Reference Frame (APREF) project is an initiative that recognizes the importance of improving the regional geodetic framework in the Asia-Pacific region. A substantial number of state-of-the-art GNSS networks, operated by national mapping agencies and private sector organizations, are available in the region. In the APREF initiative these networks are combined to realize a high-standard regional reference frame. The GNSS data of the network are processed by different Analysis Centres (ACs). The contributions of the different ACs are combined into a weekly solution by the APREF Central Bureau. This weekly solution is the core product of the APREF; it contains weekly estimates of the coordinates of the participating Asia-Pacific GNSS tracking stations and their covariance information. The APREF products, which have been available since the first quarter of 2010, gives a reliable time-series of a regional reference frame in the International Terrestrial Reference Frame and a quality assessment of the performance of the GNSS CORS stations included in the network. This contribution gives an overview of the current status of the APREF network and an analysis of the first APREF products.

  • This report outlines the high precision level survey completed between the SEAFRAME tide gauge and continuous GPS station in Tarawa, Kiribati from 14 - 21 September 2010.

  • This report outlines the high precision level survey completed between the SEAFRAME tide gauge and continuous GPS station in Manus Island, Papua New Guinea from 6 - 8 December 2010.

  • This report outlines the level survey completed during the visit to Pohnpei, Federated States of Micronesia (FSM) from 20 February - 4 March 2011.

  • This report outlines the high precision level survey completed between the SEAFRAME tide gauge and continuous GPS station in Apia, Western Samoa from 18 - 30 May 2010.

  • This report outlines the high precision level survey completed between the SEAFRAME tide gauge and continuous GPS station in Nuku-alofa, Tonga from 17 - 23 September 2011.

  • This report outlines the high precision level survey completed between the SEAFRAME tide gauge and continuous GPS station in Port Vila, Vanuatu from 01 - 06 April 2011.

  • An application dated 12 December 2011 for verification of a reference standard of measurement under Regulation 12 of the National Measurement Regulations 1999 was received from the Position Partners PTY LTD for verification of GDA94 position on their owned or managed station monuments. This report documents the processing and analysis of GPS data observed by the Position Partners PTY LTD during a 7-day period from 20 to 26 November 2011 (day of year 324 to 330) for three stations (5KAD, 5LON and 5REG) to satisfy the position verification requirements.

  • An application dated 27th October 2010 for verification of a reference standard of measurement under Regulation 12 of the National Measurement Regulations 1999 was received from the Land and Property Management Authority, NSW for verification of GDA94 position on their CORSnet monuments. This report documents the processing and analysis of GPS data observed by the CORSnet-NSW GPS stations during a 7-day period from 17 October to 23 October 2010 (day of year 290 to 296) for 6 stations (GFTN, GLIN, MACK, TAMW, TNTR and WLGT) to satisfy the position verification requirements.

  • An application dated 25 August 2010 for verification of a reference standard of measurement under Regulation 12 of the National Measurement Regulations 1999 was received from the Department of Environment and Resource, QLD for verification of GDA94 position on their Queensland Department of Environment and Resource Management CORS station monuments. This report documents the processing and analysis of GPS data observed by the Department of Environment and Resource Management CORS stations during a 7-day period from 15 August to 21 August 2010 (day of year 227 to 233) for 11 stations (BDST, BEE2, CBLT, CLEV, DALB, GATT, IPS2, ROBI, TOOW, WARW and WOOL) to satisfy the position verification requirements.