This page contains information on how to download the GD2000it software.


GD2000it is the software that LINZ provides (free of charge) to convert coordinates between NZGD1949 and NZGD2000 using the distortion grid. Alternatively, online conversions of coordinates also use this transformation. Example coordinates transformed using the distortion grid are also available.



Download and use of this software applications is taken to be acceptance of the following conditions:

  • Land Information New Zealand (LINZ) does not offer any support for this software.
  • The software is provided "as is" and without warranty of any kind. In no event shall LINZ be liable for loss of any kind whatsoever with respect to the download, installation and use of the software.
  • The software is designed to work with MS Windows. However, LINZ makes no warranty regarding the performance or non-performance of the software on any particular system or system configuration.

GD2000it version 2.01 software

GD2000it v2.01 (zip 364KB)
Last updated 25 August 2000. This download contains a readme file, the GD2000it version 2.01 software and the binary version of the distortion grid file called NZGD2KGRID0005.gsb (attachment below).

Download other geodetic software or check LINZ datasets, downloads and software.


Program Updates

Version 2.0 dated 3 May 2000

The original release of the GD2000it software contained a binary grid file (NZGD2KGRID9911.GSB) that did not strictly conform with the NTv2 format. Version 2.0 now corrects this inconsistency. The ASCII file did conform. The reformatted grid file has not changed the transformation values. For further information on the changes to the format refer to the "NTv2 Binary Files" in the online Help files within GD2000it.

Version 2.01 dated 25 August 2000

This version fixes a minor bug that was recently identified. The bug affects the output of coordinates in HP format and will only occur if:

  • an input file is being used
  • coordinates are being output in HP notation, and
  • the output coordinate has a seconds component that is less than 0.1" eg 0.09".

The bug causes the seconds output value to be shifted left one place. In the worst case this will produce an error of (0.9 - 0.09)" which is approximately 24 metres.