These standards did not change the way that the control Orders are numbered.
The major change to the control mark Orders was the simplification of the network accuracy tolerances. Network accuracy was previously known as ‘absolute accuracy’ and the maximum errors were defined to the millimetre level. LINZS25006 has grouped these values into 5cm bands (called Tiers) that are more meaningful to users. This means that the same Tier can be defined for several Orders. Minor changes were also made to the local accuracy values for Orders 0 and 5.
The new control mark Orders and the changes from the previous system are summarised in the following table:
| Order | Purpose | Network Accuracy | Local Accuracy | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tier | Absolute (old) | Horizontal | Vertical | ||||||||||
| Horiz (m) |
Vert (m) |
Horiz (m) |
Vert (m) |
Constant (m) |
Proportion (m/m) |
Constant (m) |
Proportion (m/m) |
||||||
| 0 | National Reference Frame | A | 0.05 | A | 0.05 | 0.050 | 0.150 | II | 0.003 | 3x10-8 (1x10-8) |
II | 0.003 | 3x10-8 |
| 1 | National Deformation Monitoring | A | 0.05 | B | 0.10 | 0.071 | 0.201 | III | 0.003 | 1x10-7 | IV | 0.003 | 3x10-7 |
| 2 | Regional Deformation Monitoring | B | 0.10 | E | 0.30 | 0.087 | 0.260 | V | 0.003 | 1x10-6 | VI | 0.010 | 3x10-6 |
| 3 | - | B | 0.10 | E | 0.30 | 0.100 | 0.300 | VI | 0.010 | 3x10-6 | VII | 0.010 | 1x10-5 |
| 4 | Local Deformation Monitoring | C | 0.15 | F | 0.35 | 0.112 | 0.335 | VII | 0.010 | 1x10-5 | VIII | 0.010 | 3x10-5 |
| 5 | Cadastral Horizontal Control; Geospatial | C | 0.15 | F | 0.35 | 0.122 | 0.367 | VIII | 0.010 | 5x10-5 (3x10-5) |
IX | 0.020 (0.010) |
1x10-4 |
Previous values are shown in italics. Vertical errors relate to ellipsoidal heights determined with the horizontal coordinate. There is a separate set of height Orders for normal-orthometric heights. Find out about changes to cadastral mark Orders.