The Surveyor-General Victoria (SGV) Geodetic Survey section is responsible for managing Victoria's geodetic and positioning infrastructure. This is the infrastructure that enables users to determine positions and heights in relation to the nationally adopted Geocentric Datum of Australia (GDA94 or GDA2020) and Australian Height Datum (AHD). Accurate and reliable access to position and height reference systems – global and regional – supports a wide range of spatial applications, such as mapping, navigation, surveying and major construction projects.

Victoria's geodetic infrastructure is comprised of:

  • Vicmap Position-GPSnet Global Navigation Satellite System (GNSS) Continuously Operating Reference Station (CORS) network
  • a network of survey control marks
  • authoritative information on survey control marks stored in the Survey Marks Enquiry Service database
  • a large archive of survey measurements to Victoria's survey control mark network
  • automated systems for the processing, analysis and delivery of survey control mark coordinates.


Our vision for geodesy in Victoria is to provide accurate and reliable positioning, now and in the future.

Strategy for Victoria's positioning system 2016 - 2020

This strategy documents the path to maintain and enhance Victoria's geodetic infrastructure so that the public, commercial, academic and scientific sectors have access to accurate and reliable positioning.

Strategy for Victoria's positioning system 2016 - 2020 (PDF, 5.4 MB)
Strategy for Victoria's positioning system 2016 - 2020 (DOCX, 2.5 MB)

Geocentric Datum of Australia

The Geocentric Datum of Australia 1994 (GDA94) is Australia's official geodetic datum and was adopted on 1 January 2000.  GDA94 is a static coordinate datum based on the International Terrestrial Reference Frame 1992 (ITRF92), held at the reference epoch of 1 January 1994. GDA94 is maintained in Victoria through the repeated adjustment of the Victorian survey control mark network and constrained to align with the GPSNet GNSS CORS network.

SGV supports the transformation of coordinates between the Australian Geodetic Datum 1966 (AGD66) and GDA94 through the GDAit software.

The Geocentric Datum of Australia 2020 (GDA2020) is a modernised geodetic datum for Australia, which will be made available in Victoria throughout 2017 and 2018. GDA2020 is a conventional static datum based on ITRF2014 at the reference epoch of 1 January 2020. Information on GDA2020 and transformation tools are available for the transition to GDA2020 through the Intergovernmental Committee on Surveying and Mapping (ICSM).

Vicmap Position - GPSnet

Vicmap Position - GPSnet is a positioning and navigation correction service available for GNSS users throughout Victoria. SGV maintains an integrated network of GNSS Continuously Operating Reference Stations (CORS) that facilitate the GPSnet service. This infrastructure supports consistent, homogenous and reliable satellite positioning and navigation anywhere in Victoria.

Visit the GPSnet website

Page last updated: 14/08/19