This page outlines multiple ways to transform geodetic coordinates. The choice of which method is the most appropriate will depend on the accuracy of the coordinates being converted and their intended use.
|Transformation Method||Nominal Accuracy|
|3 parameter similarity||5 metres|
|7 parameter similarity||4 metres|
|Distortion grid||0.1 - 1.0 metres|
These transformations are formally defined in the LINZ standard LINZS25000 (Standard for New Zealand Geodetic Datum 2000), and are summarised in the associated NZGD2000 fact sheet (LINZG25700).
Because NZGD1949 is only defined as a horizontal datum all of the transformations described above can only be applied to horizontal coordinates. Heights cannot be transformed in terms of NZGD1949.
Overview and details of the three and seven parameter similarity transformations for converting between NZGD1949 and NZGD2000. more...
Overview and details of the distortion grid for converting between NZGD1949 and NZGD2000. more...