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GDA Useful Tools GDAit Transformation Software Please note that while every effort has been made to ensure the accuracy and currency of GDAit and the Victorian grid data, the State of Victoria does not accept responsibility for any actions arising from the use of the software or data. If you would like to download the latest national version of GDAit V2.02, please click the readme.txt below for further instructions. This file has information on how to install the software and grid on your computer, as well as a history LOG showing the changes which have occurred with the GDAit software and grid files during its development. Note the latest grid file is downloaded separately from the GDAit software on this website. Please read below for further instructions regarding the grid file and its download. Complete download instructions GDAit for Windows NT/95 Download and then execute to automatically install GDAit onto your computer. The current grid file will have to be manually imported into GDAit once the GDAit software has been installed (see readme.txt). GDAit Version 2.02 - 32 bit (Windows 95 / 98 / 2000 / NT / ME) Grid File A National Transformation Grid File is now available from the ICSM and replaces all previous versions of the grid files (Victorian, South East Australia, etc). The complete national coverage from AGD to GDA is 3.2 mb. This coverage was generated using the latest algorithms with data from the previous AGD State & Territory grid files and AGD & GDA data from the National Geodetic Data Base. The national file also covers the offshore areas out to the Exclusive Economic Zone (EEZ). The grid is supplied in the NTv2 format and a simple conformal (7-parameter) transformation was used to generate the shifts in these offshore areas. GDAit for Web users If you would like to transform some coordinates now on the web go to GDAit on the Web. GDAit User Manuals The first of the following two Acrobat documents is the user manual for GDAit. The user manual is the same as the on line help included in the software downloads. The second document explains the software architecture of GDAit, including the Bi-linear interpolation technique used to interpolate the transformation grid file. User guide Software documentation GDAit DLL for Software Developers GDAit DLL is the Dynamic Link Library version of GDAit which transforms coordinates between AGD (66/84) and GDA and vice versa. The DLL is freely available for download and use by developers to incorporate into their software (provided appropriate acknowledgement of Land Victoria is included). An accompanying document describes the functions contained in the DLL and how to call them from C or Visual Basic. For detailed information on the transformation process please refer to the GDAit User Guide and Software Documentation. Coverage Map A national coverage grid has been computed. To see the extents of the current National NTv2 grid view the Coverage Map. GDA Control Dataset This dataset was created for the purposes of testing the accuracy to which applications execute datum transformations. This dataset contains a series of coordinate values across Victoria. These coordinate values are represented in the three most commonly used coordinate systems, based on the Australian Geodetic Datum, as well as their GDA equivalents. The coordinate systems are:
As such this control dataset is a useful tool for testing the GDA Compliance of any transformation software. Note: when testing and completing transformations ensure that the output coordinate values contain the same number of decimal places as the source. This will ensure that the accuracy of the transformation is consistent with the source. AMGVG Conversion Software Download and then execute this program to perform calculations with co-ordinates as depicted in the two main screen options below. Note this software DOES NOT TRANSFORM coordinate information between AGD and GDA, either geographical or UTM grid coordinates. Map Grid of Australia (MGA) Input Screen Australian Map Grid (AMG) Input Screen
Note: V3.0 was removed on 28/01/03 due to an error in one co-ordinate transformation . This issue has been fixed in V3.1. This document was last reviewed on 26/05/2008.
© 2007 by the State of Victoria
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