The NRF provides the connection between national geodetic and vertical datums, and international reference systems.
The following table summarises the main characteristics of the network.
|Purpose||To enable the link between official geodetic and vertical datums and international reference systems to be determined and monitored|
At least one geodetic datum reference mark (GDRM) on the stable part of each tectonic plate (Pacific, Australian, Antarctic)
Vertical datum reference mark (VDRM) to be co-located with each GDRM
Tier: Horiz A (0.05 m), Vert A (0.05 m)
Class: Horiz II (0.003 m, 3x10-8m/m), Vert II (0.003 m, 3x10-8m/m)
Class evaluation radius: all NRF marks
GDRM normally continuous GNSS
VDRM normally absolute gravity
May co-locate with other observation systems (VLBI, DORIS)
To enable GNSS collection (GDRM)
To enable absolute gravity collection (VDRM)
Data available from LINZ website
No physical access to mark