Coordinate & Height Accuracy

The accuracy of coordinates and heights is indicated by a series of classifications called Orders. The following Order classification schemes are used in New Zealand.

Coordinate Orders

Positions in terms of NZGD2000 or RSRGD2000 are described by two or three-dimensional coordinates (latitude, longitude, ellipsoidal height). The accuracy of the coordinates is described in terms of horizontal and vertical components. more...

Height Orders

NZVD2009 heights and heights in terms of the 13 mean sea level datums have a separate classification scheme. The accuracy of heights is described in terms of a vertical component. more...

Accuracy terms & definitions

The reliability of a coordinate or height is described in two ways: local accuracy and network accuracy. These measures are combined into classifications called Orders. more...

Changing to the new Orders

A new set of Orders for positions and heights was introduced to New Zealand and the Ross Sea Region in May 2010. This means that the Order of some coordinates and heights will have changed to reflect the new classification scheme. more...

Historic coordinate & height Orders

Prior to May 2010 a different set of Orders was used to describe the accuracy of NZGD2000 and RSRGD2000 coordinates and normal-orthometric heights. NZGD1949 coordinates also had its own unique Order system. more...