Coordinate systems

New Zealand Map Grid (NZMG)

W. I. Reilly published the New Zealand Map Grid design in 1973. NZMG used a polynomial expression tailored to reduce scale distortion over New Zealand and was used with NZGD49 for the NZMS260 topographic series.

Sources · 1

LINZ, New Zealand Map Grid

NZMG’s specialised mathematics later proved difficult to support in some international software. LINZ replaced it with a newer official grid in 2001; historic coordinates still need their original grid and a documented transformation.

Sources · 1

LINZ, New Zealand Map Grid

Sources and further reading · 1

LINZ, New Zealand Map Grid

Indexed passages

Transforming one coordinate world into anotherSurvey calculations
Geodetic adjustmentSurvey calculations

Entry details

Map projection

Other names

NZMG
New Zealand Map Grid

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Events in passages indexed with this entry · 1

These dates belong to linked passages. They do not establish dates for this entry.

1973 · New Zealand Map Grid designed

Connections

3 documented relationships. Select a connection to read its basis and sources.

NZMG projection used with NZGD49 datumNew Zealand Geodetic Datum 1949 (NZGD49)
Connection basis
LINZ identifies NZMG as based on NZGD1949.
Sources · 2
1. LINZ, New Zealand Map Grid
2. LINZ, New Zealand Geodetic Datum 1949
Used NZMG as its map projectionNew Zealand Map Series 260 (NZMS260)
Connection basis
LINZ identifies NZMG as the projection used to produce the NZMS260 series.
Sources · 2
1. LINZ, New Zealand Map Grid
2. Te Ara, Mapping and surveying, 1950–1980
Designed the projection published in 1973W. I. Reilly
Connection basis
LINZ identifies Reilly’s 1973 paper as the description of the New Zealand Map Grid.
Sources · 1
1. LINZ, New Zealand Map Grid