Annotated edit history of
NewZealandMapGrid version 4, including all changes.
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The NewZealandMapGrid (NZMG) is a projection used for describing locations in NZ in terms of a Northing/Easting (much like [UTM]) using the [NZGD49] datum. It was designed specifically for NewZealand by Dr W. I. Reilly in 1973 to reduce error over the whole country and as such cannot be used for other parts of the world. |
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Converting NZMG co-ordinates to a Latitude/Longitude co-ordinates (most common being [WGS84]) involves using complex polynomial equation. Because NZMG uses the old [NZGD49] datum, co-ordinates must be converted to [NZGD49] to take into account any distortions before applying the equation. Other common datums used that need conversion might be [NZGD2000] or [WGS84]. |
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The topographic and cadastral data sourced from [LINZ] is provided with NZMG coordinates. |
