Orders are classifications based on the quality of the coordinate in relation to the datum (Tier) and in relation to other surrounding marks (Class).
The horizontal position of a mark will be defined by a NZGD2000 or RSRGD2000 coordinate with its own horizontal Order.
The following table summarises the Tier and Class requirements for each Order.
|Order||Purpose||Tier (95% CI, m)||Class (95% CI)
|Class (95% CI)
|1V||National height network||0.25||0.01||0.000 003|
|3V||Cadastral vertical control||0.35||0.02||0.000 1|
Order 6V has no accuracy upper accuracy limit, it contains all coordinates with an accuracy less than Order 5V.