Datums & Coordinate systems

General Information

It is important that spatial data is used with a relevant datum and coordinate system. An overview of these important topics can be viewed at: www.ga.gov.au/geodesy/datums

Geocentric Datum of Australia
The Geocentric Datum of Australia (GDA) is the nation’s official spatial datum. GDA provides a single standard for collecting, storing and applying spatial data at all levels – local, regional, national and international.

The key advantages of GDA (compared to Australia’s superseded datum Australian Geodetic Datum - AGD) is that GDA is compatible with satellite based positioning and navigation systems such as the Global Positioning System (GPS) and major international geographic systems (GIS). It should be noted that GDA is the datum, while GDA94 is the geodetic coordinates (latitude and longitude) computed in terms of the datum at 1 January 1994. The Universal Transverse Mercator coordinates (east, north and zone) generated from GDA94 are known as MGA94 (Map Grid of Australia 1994) coordinates.

For national information - Geocentric Datum Of Australia

Victoria specific information


The VICGRID94 Map Projection was specified and adopted by DEPI on the 7th of February 2000 in response to user need.

VICGRID94 is a projection created to cater for the needs of spatial data users with large regional area interests in and beyond the state of Victoria VICGRID94 can be used to display Victoria, New South Wales, Tasmania and South Australia as a single entity. and who also wish to use the Geocentric Datum of Australia 1994 (GDA94) as the underlying datum (rather than the Australian Geodetic Datum 1966 (AGD66) on which the original VICGRID(66) was based).

For more technical information on VICGRID94 download this document.  VICGRID94 Map Projection Information [PDF File - 141.2 KB]

Victorian Bounding Box

- for MapInfo Professional users

Any MapInfo Professional user that wants to store MapInfo Professional data to millimetre precision and cover Victoria should use the projections defined in this linked information. This information has been prepared in consultation with MapInfo Australia. The Victorian Spatial Council supports this initiative.

Please note:
Document(s) on this page are presented in PDF format. If you do not have the Adobe Reader, you can download a copy free from the Adobe website.