New Zealand Vertical Datum 2009 (NZVD2009) was the official national vertical datum used in New Zealand between September 2009 and June 2016. It was New Zealand’s first vertical datum that allowed us to produce nationally consistent normal-orthometric heights (h).
A vertical datum is a reference system that defines a how heights are represented. For NZVD2009, this includes the definition of its reference surface, the New Zealand Quasigeoid 2009 (NZGeoid2009). Its horizontal coordinates are coincident with New Zealand Geodetic Datum 2000 (NZGD2000), allowing us to transform NZGD2000 ellipsoidal heights to NZVD2009 normal-orthometric heights.
New Zealand Geodetic Datum 2000
New Zealand Geodetic Datum 2000 Ellipsoidal Heights
NZVD2009 was succeeded by NZVD2016 in July 2016. The specifications for NZVD2009 were defined in the Standard for New Zealand Vertical Datum 2009 LINZS25004. An article from New Zealand Surveyor (link at the bottom of this page) includes more information.
Standard for New Zealand Vertical Datum 2009
| Name | New Zealand Vertical Datum 2009 |
|---|---|
| Abbreviation | NZVD2009 |
| EPSG code | 4440 |
| Coordinate system | Vertical: normal-orthometric |
| Reference geoid | New Zealand Quasigeoid 2009 (NZGeoid2009) |
| Local vertical datum | NZGeoid2009 offset (metres) | Standard deviation (metres) |
|---|---|---|
| One Tree Point 1964 | 0.06 | 0.03 |
| Auckland 1946 | 0.34 | 0.05 |
| Moturiki 1953 | 0.24 | 0.06 |
| Gisborne 1926 | 0.34 | 0.02 |
| Napier 1962 | 0.20 | 0.05 |
| Taranaki 1970 | 0.32 | 0.05 |
| Wellington 1953 | 0.44 | 0.04 |
| Nelson 1955 | 0.29 | 0.07 |
| Lyttelton 1937 | 0.47 | 0.09 |
| Dunedin 1958 | 0.49 | 0.07 |
| Dunedin-Bluff 1960 | 0.38 | 0.04 |
| Bluff 1955 | 0.36 | 0.05 |
| Stewart Island 1977 | 0.39 | 0.15 |