Changes to Control Mark Orders

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.