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New Zealand Transverse Mercator Projection 2000 (NZTM2000)
The official coordinate system for New Zealand's future topographic and other small scale mapping is New Zealand Transverse Mercator 2000 (NZTM2000). Other spatial data users are encouraged to use NZTM2000 where a projection is required. The new 1:50,000 map series NZTopo50 will be produced in terms of NZTM2000.
NZTM2000 uses the geometric transverse Mercator projection and is based on the NZGD2000 datum using the GRS80 reference ellipsoid. It was chosen because it is an internationally recognised type of projection that exhibits a low level of distortion at its east-west extents. The projection is only applicable for the main New Zealand island group (North, South, Stewart/Rakiura and the smaller coastal islands). Separate projections are defined for the New Zealand's offshore islands and for its continental shelf.
NZTM2000 is formally defined in the LINZ standard LINZS25002 (Standard for New Zealand Geodetic Datum 2000 Projections). The key parameters from this standard are summarised below:
| Name: |
New Zealand Transverse Mercator 2000 |
| Abbreviation: |
NZTM2000 |
| Projection type: |
Transverse Mercator |
| Reference ellipsoid: |
GRS80 |
| Datum: |
NZGD2000 |
| Origin latitude: |
0° 00' 00" South |
| Origin longitude: |
173° 00' 00" East |
| False Northing: |
10,000,000 metres North |
| False Easting: |
1,600,000 metres East |
| Central meridian scale factor: |
0.9996 |
The predecessor projection to NZTM2000 was New Zealand Map Grid (NZMG). NZMG was based on the NZGD49 datum. More information about converting coordinates between the NZTM2000 and NZMG projections is available on the coordinate conversion pages.
"C" language source code is available to facilitate the incorporation of the NZTM2000 projection in the development of software applications.
Related Documents:
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