Geocentric Datum of Australia (GDA) transformation software

The Geocentric Datum of Australia is being updated from GDA94 to GDA2020. This change will bring Australia’s national latitude and longitude coordinates into line with satellite positioning systems, making it possible for smartphones and other positioning technologies to accurately align with features marked on our maps.

The Department of Natural Resources, Mines and Energy is responsible for implementing the change in Queensland. Until the official adoption of GDA2020 in Queensland, the department will continue to make the GDAy software available to help users transform coordinates between previous datums and GDA94. The software can also be used for converting between geographical coordinates (GDA94 latitude and longitude) and projection coordinates (MGA94, easting, northing and zone).

GDAy software

GDAy uses distortion modelling and handles a range of ASCII formats as well as file formats of particular relevance to Queensland standards (e.g. QIF format for the Digital Cadastral Database).

The version of GDAy for 32-bit Windows can be downloaded below and includes the current transformation grid. This version of the software should run successfully on Windows 7 64-bit, but has not been tested on Windows 8.

A 64-bit Windows version of GDAy can be downloaded below. This version does not have a windows installer and you will need to manually run the .reg file to install the components on your target machines.

Note: The GDAy software is provided as is, and we do not provide any additional maintenance or support. There are no plans to release any upgrades to the GDAy software. The software licence agreement is located within the GDAy user guide.

GDA software development kit

The dynamic link library is provided to support special requirements. Read the technical specification for more detailed information:

Queensland transformation grid

A subset of the national distortion grid is also available for users who only require Queensland coverage or use software other than GDAy. The Queensland AGD84 distortion grid (QLD_900) is available for Windows 32-bit platforms. The Queensland grid produces identical results to the National AGD84 grid for the equivalent coverage.

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General enquiries 13 QGOV (13 74 68)