Software and plugins

GDA94 ⇔ GDA2020 transformation and conversion tools


Downloadable tool coming soon!

A GDA94 ⇔ GDA2020 version of GDAy will be provided after the GDA94 ⇔ GDA2020 NTv2 grids are available.

QGIS Plugins

ICSM has developed two plugins for the free and open source QGIS software to perform transformations using the national NTv2 grids.

An existing NTv2 transformation plugin, accesses from the processing toolbox, now incorporates the NTv2 grids to transform between AGD66 / 84 and GDA94. Please note that as of April 2018, this plugin is not yet available in QGIS 3.0.

An ICSM branded plugin dealing only with NTv2 transformations between Australian datums has also been developed.

Image of Plugin manager from QGIS version 2.18.9

The plugins cater for the GDA94⇔GDA2020 conformal and GDA94⇔GDA2020 conformal and distortion transformation cases.


GDA94 ⇔ AGD66/84 Transformation and Conversion Tools

The online transformation service and QGIS plugins will support NTv2 grid transformations using the national transformation grids.

The following software, which supports the NTv2 transformation grids, is freely available from the named jurisdiction.

ICSM also developed the following resources:

NOTE: Online versions of Vincenty’s and Redfearns Formulae are also available on the Geoscience Australia website. The online calculators provide the same results as the spreadsheets in the Technical Manual.

AUSGeoid Products and Tools

AUSGeoid files enable GDA94 and GDA2020 ellipsoidal heights to be transformed to Australian Height Datum (AHD) heights. Information about AUSGeoid as well as the products and tools are available from Geoscience Australia :

Downloadable interpolation software, developed by Dr Roger Fraser from Victoria, is also available:

Latest version of geoid interpolation program. Requires geoid grid file in either WINTER DAT format or NTv2 gsb format. Offers interactive and file interpolation modes and the ability to create a single NTv2 file from a grid file in the legacy AUSGeoid DAT file format. Software documentation is provided.
(Users who experience problems running this software for the first time should install the Microsoft Visual C++ 2008 Libraries.)