This page contains information on height orders including the Tier and Class requirements for each.
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.