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Positions in terms of NZGD2000 and RSRGD2000 are described by three-dimensional coordinates (latitude, longitude, ellipsoidal height). The accuracy of a survey mark is indicated by its Order. Orders are classifications based on the quality of the coordinate in relation to the datum (Tier) and in relation to other surrounding marks (Class).
Orders 0 to 5 have different horizontal and vertical accuracy tolerances (as specified below). The vertical tolerances for ellipsoidal heights of Orders 6 to 11 are the same as the horizontal tolerances.
Orders 0 to 8 are considered to be survey accurate and the Class defines the local accuracy between marks. Orders 6, 7 and 8 are applied to Landonline survey accurate non-boundary, Class A boundary and Class B boundary marks respectively.
Orders 6 to 12 are not used for marks in the RSRGD2000 (Antarctica).
The following table summarises the Tier and Class requirements for each Order.
|Order||Purpose||Tier (95% CI, m)||Class (95% CI)|
|Constant (m)||Proportional (m/m)|
|0||National reference frame||H 0.05
|H 0.000 000 03
V 0.000 000 03
|1||National deformation monitoring||H 0.05
|H 0.000 000 1
V 0.000 000 3
|2||Regional deformation monitoring||H 0.10
|H 0.000 001
V 0.000 003
|H 0.000 003
V 0.000 01
|4||Local deformation monitoring||H 0.15
|H 0.000 01
V 0.000 03
|5||Cadastral horizontal control
Basic geospatial network
|H 0.000 05
V 0.000 1
|6||Cadastral permanent reference marks
Cadastral witness marks
|7||Class A boundary marks||0.2||0.06||0.000 15|
|8||Class B boundary marks||0.5||0.3||0.000 6|
|9||Class C boundary marks||5||1||0.003|
Order 12 has no upper accuracy limit, it contains all coordinates with an accuracy less than Order 11.
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