This page 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.
Density
- 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
Accuracy
- Order: 0
- 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
Mark characteristics
- GDRM normally continuous GNSS
- VDRM normally absolute gravity
- May co-locate with other observation systems (VLBI, DORIS)
Location
- To enable GNSS collection (GDRM)
- To enable absolute gravity collection (VDRM)
Mark access
- Data available from LINZ website
- No physical access to mark