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) Constant (m) |
Class (95% CI) Proportional (m/m) |
---|---|---|---|---|
1V | National height network | 0.25 | 0.01 | 0.000 003 |
2V | - | 0.35 | 0.01 | 0.000 01 |
3V | Cadastral vertical control | 0.35 | 0.02 | 0.000 1 |
4V | - | 0.5 | 0.03 | 0.000 15 |
5V | - | 1 | 0.3 | 0.000 6 |
6V | - | - | - | - |
Order 6V has no accuracy upper accuracy limit, it contains all coordinates with an accuracy less than Order 5V.