Positioning

Theme Working Group or Committees 
Positioning is Australia's authoritative, reliable, high accuracy spatial referencing system. The positioning service defined under this theme includes the coordinates and their uncertainty of all location-based data promulgated from, or related to, the Australian Fiducial Network (AFN) and the defining Australian Height Datum tide gauge stations. The positioning service is underpinned by physical geodetic infrastructure, such as the survey marks and Global Navigation Satellite System (GNSS) networks, geodetic modelling (e.g. the coordinate transformations), and definitions of the geoid and bathymetric reference surfaces.

FSDF datasets in this theme

Theme Purpose

Positioning is Australia's authoritative, reliable, high accuracy spatial referencing system and it provides a common reference for all geospatial data. Services are used by specialists and non-specialists alike, for a growing number of applications.

For example:

  • surveying
  • construction
  • mining
  • precision agriculture
  • asset capture tracking 
  • navigation
  • emergency response
  • law enforcement 
  • insurance 
  • security
  • climate/weather forecast, and
  • recreation

Status

Theme Current Status 
While there is currently no nationally coordinated approach to managing the National Positioning Infrastructure (NPI) (i.e. Continuously Operating Reference Stations (CORS) and the associated real-time positioning services), the NPI Implementation Plan does provide a roadmap to achieve this. Real-time positioning services currently support 2–5 cm accuracy positioning but only in two jurisdictions, Victoria and NSW, with dense (70 km station spacing) CORS networks. The national geoid model (i.e. AUSGeoid) currently supports the measurement of height with respect to AHD using GNSS with an accuracy of 6 cm at best. While there is currently no nationally coordinated approach to managing the National Positioning Infrastructure (NPI) (i.e. Continuously Operating Reference Stations (CORS) and the associated real-time positioning services), the NPI Implementation Plan does provide a roadmap to achieve this. Real-time positioning services currently support 2–5 cm accuracy positioning but only in two jurisdictions, Victoria and NSW, with dense (70 km station spacing) CORS networks. The national geoid model (i.e. AUSGeoid) currently supports the measurement of height with respect to AHD using GNSS with an accuracy of 6 cm at best.
Theme Future Status 
The Positioning Service is being progressively upgraded with datum modernisation being driven by the anticipated development of the National Positioning Infrastructure (NPI) which will be capable of delivering coordinates with centimetre accuracy. Working with the Cooperative Research Centre for Spatial Information (CRCSI), the Intergovernmental Committee on Surveying and Mapping (ICSM) Permanent Committee on Geodesy (PCG) is developing an upgrade roadmap. The refinement of the national geodetic infrastructure is outlined in the National Positioning Infrastructure (NPI) Plan . The NPI plan will improve the existing GNSS CORS infrastructure, governance and data sharing arrangements and will augment the existing infrastructure with a fully multi-GNSS capable, high integrity, trusted CORS network with a 200 km inter-station spacing. The Permanent Committee on Geodesy (PCG) will update the Geocentric Datum of Australia 1994 (GDA94) by 2015. This will be the first rigorous national adjustment. The national geoid model will undergo iterative improvements as additional terrestrial (gravity and survey) and satellite gravity data becomes available. In order to maximise the benefits of positioning and the enabling infrastructure, and to provide assurance to users of the fitness for purpose of the position outputs, guiding principles are required to enable the consistent and reliable determination and use of position information.

Theme Coverage

Complete, current and continuous NGRS coverage for all Australia and its maritime jurisdictions supporting instantaneous, reliable and fit-for-purpose positioning and time services anywhere and anytime.