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The OTP64NZGD2000 grid enables the conversion of normalorthometric heights from the One Tree Point 1964 local vertical datum directly to New Zealand Geodetic Datum 2000 (NZGD2000) ellipsoidal heights. OTP64NZGD2000 is published on a one arcminute grid (approximately 1.8 kilometres) extending over the benchmarks that nominally define the extent of the One Tree Point 1964 vertical datum (172.6° E to 175.0° E, 34.3° S to 36.8° S). The conversion value is represented by the attribute “delta”, in metres. This grid is a combination of New Zealand Quasigeoid 2016 [NZGeoid2016](https://data.linz.govt.nz/layer/3418) and the [OTP64NZVD2016](https://data.linz.govt.nz/layer/3440) height conversion grid. Where NZGeoid2016 is the reference surface for the New Zealand Vertical Datum 2016 (NZVD2016), while the OTP64NZVD2016 grid models the difference between the One Tree Point 1964 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodeticservices/coordinateconversion/convertingbetweennzvd2016nzgd2000andlocalverticaldatums).

The TNK70NZGD2000 grid enables the conversion of normalorthometric heights from the Taranaki 1970 local vertical datum directly to New Zealand Geodetic Datum 2000 (NZGD2000) ellipsoidal heights. TNK70NZGD2000 is published on a one arcminute grid (approximately 1.8 kilometres) extending over the benchmarks that nominally define the extent of the Taranaki 1970 vertical datum (173.6° E to 176.4° E, 38.3° S to 41.1° S). The conversion value is represented by the attribute “delta”, in metres. This grid is a combination of New Zealand Quasigeoid 2016 [NZGeoid2016](https://data.linz.govt.nz/layer/3418) and the [TNK70NZVD2016](https://data.linz.govt.nz/layer/3444) height conversion grid. Where NZGeoid2016 is the reference surface for the New Zealand Vertical Datum 2016 (NZVD2016), while the TNK70NZVD2016 grid models the difference between the Taranaki 1970 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodeticservices/coordinateconversion/convertingbetweennzvd2016nzgd2000andlocalverticaldatums).

The NPR62NZGD2000 grid enables the conversion of normalorthometric heights from the Napier 162 ocal vertical datum directly to New Zealand Geodetic Datum 2000 (NZGD2000) ellipsoidal heights. NPR62NZGD2000 is published on a one arcminute grid (approximately 1.8 kilometres) extending over the benchmarks that nominally define the extent of the Napier 1962 vertical datum (175.6° E to 177.9° E, 38.6° S to 40.6° S). The conversion value is represented by the attribute “delta”, in metres. This grid is a combination of New Zealand Quasigeoid 2016 [NZGeoid2016](https://data.linz.govt.nz/layer/3418) and the [NPR62NZVD2016](https://data.linz.govt.nz/layer/3436) height conversion grid. Where NZGeoid2016 is the reference surface for the New Zealand Vertical Datum 2016 (NZVD2016), while the NPR62NZVD2016 grid models the difference between the Napier 1962 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodeticservices/coordinateconversion/convertingbetweennzvd2016nzgd2000andlocalverticaldatums).

The NSN55NZGD2000 grid enables the conversion of normalorthometric heights from the Nelson 1955 local vertical datum directly to New Zealand Geodetic Datum 2000 (NZGD2000) ellipsoidal heights. NSN55NZGD2000 is published on a one arcminute grid (approximately 1.8 kilometres) extending over the benchmarks that nominally define the extent of the Nelson 1955 vertical datum (171.3° E to 174.4° E, 40.4° S to 42.7° S). The conversion value is represented by the attribute “delta”, in metres. This grid is a combination of New Zealand Quasigeoid 2016 [NZGeoid2016](https://data.linz.govt.nz/layer/3418) and the [NSN55NZVD2016](https://data.linz.govt.nz/layer/3438) height conversion grid. Where NZGeoid2016 is the reference surface for the New Zealand Vertical Datum 2016 (NZVD2016), while the NSN55NZVD2016 grid models the difference between the Nelson 1955 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodeticservices/coordinateconversion/convertingbetweennzvd2016nzgd2000andlocalverticaldatums).

The AUK46NZGD2000 grid enables the conversion of normalorthometric heights from the Auckland 1946 local vertical datum directly to New Zealand Geodetic Datum 2000 (NZGD2000) ellipsoidal heights. AUK46NZGD2000 is published on a one arcminute grid (approximately 1.8 kilometres) extending over the benchmarks that nominally define the extent of the Auckland 1946 vertical datum (174.0° E to 176.2° E, 36.1° S to 38.0° S). The conversion value is represented by the attribute “delta”, in metres. This grid is a combination of New Zealand Quasigeoid 2016 [NZGeoid2016](https://data.linz.govt.nz/layer/3418) and the [AUK46NZVD2016](https://data.linz.govt.nz/layer/3417) height conversion grid. Where NZGeoid2016 is the reference surface for the New Zealand Vertical Datum 2016 (NZVD2016), while the AUK46NZVD2016 grid models the difference between the Auckland 1946 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodeticservices/coordinateconversion/convertingbetweennzvd2016nzgd2000andlocalverticaldatums).

The DUN58NZGD2000 grid enables the conversion of normalorthometric heights from the Dunedin 1958 local vertical datum directly to New Zealand Geodetic Datum 2000 (NZGD2000) ellipsoidal heights. DUN58NZGD2000 is published on a one arcminute grid (approximately 1.8 kilometres) extending over the benchmarks that nominally define the extent of the Dunedin 1958 vertical datum (168.4° E to 171.3° E, 43.9° S to 46.5° S). The conversion value is represented by the attribute “delta”, in metres. This grid is a combination of New Zealand Quasigeoid 2016 [NZGeoid2016](https://data.linz.govt.nz/layer/3418) and the [DUN58NZVD2016](https://data.linz.govt.nz/layer/3428) height conversion grid. Where NZGeoid2016 is the reference surface for the New Zealand Vertical Datum 2016 (NZVD2016), while the DUN58NZVD2016 grid models the difference between the Dunedin 1958 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodeticservices/coordinateconversion/convertingbetweennzvd2016nzgd2000andlocalverticaldatums).

The AUK46NZGD2000 grid enables the conversion of normalorthometric heights from the Auckland 1946 local vertical datum directly to New Zealand Geodetic Datum 2000 (NZGD2000) ellipsoidal heights. AUK46NZGD2000 is published on a one arcminute grid (approximately 1.8 kilometres) extending over the benchmarks that nominally define the extent of the Auckland 1946 vertical datum (174.0° E to 176.2° E, 36.1° S to 38.0° S). The conversion value is represented by the attribute “delta”, in metres. This grid is a combination of New Zealand Quasigeoid 2016 [NZGeoid2016](https://data.linz.govt.nz/layer/3418) and the [AUK46NZVD2016](https://data.linz.govt.nz/layer/3417) height conversion grid. Where NZGeoid2016 is the reference surface for the New Zealand Vertical Datum 2016 (NZVD2016), while the AUK46NZVD2016 grid models the difference between the Auckland 1946 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodeticservices/coordinateconversion/convertingbetweennzvd2016nzgd2000andlocalverticaldatums).

The DUN58NZGD2000 grid enables the conversion of normalorthometric heights from the Dunedin 1958 local vertical datum directly to New Zealand Geodetic Datum 2000 (NZGD2000) ellipsoidal heights. DUN58NZGD2000 is published on a one arcminute grid (approximately 1.8 kilometres) extending over the benchmarks that nominally define the extent of the Dunedin 1958 vertical datum (168.4° E to 171.3° E, 43.9° S to 46.5° S). The conversion value is represented by the attribute “delta”, in metres. This grid is a combination of New Zealand Quasigeoid 2016 [NZGeoid2016](https://data.linz.govt.nz/layer/3418) and the [DUN58NZVD2016](https://data.linz.govt.nz/layer/3428) height conversion grid. Where NZGeoid2016 is the reference surface for the New Zealand Vertical Datum 2016 (NZVD2016), while the DUN58NZVD2016 grid models the difference between the Dunedin 1958 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodeticservices/coordinateconversion/convertingbetweennzvd2016nzgd2000andlocalverticaldatums).

The BLF55NZGD2000 grid enables the conversion of normalorthometric heights from the Bluff 1955 local vertical datum directly to New Zealand Geodetic Datum 2000 (NZGD2000) ellipsoidal heights. BLF55NZGD2000 is published on a one arcminute grid (approximately 1.8 kilometres) extending over the benchmarks that nominally define the extent of the Bluff 1955 vertical datum (168.2° E to 168.9° E, 46.3° S to 46.8° S). The conversion value is represented by the attribute “delta”, in metres. This grid is a combination of New Zealand Quasigeoid 2016 [NZGeoid2016](https://data.linz.govt.nz/layer/3418) and the [BLF55NZVD2016](https://data.linz.govt.nz/layer/3424) height conversion grid. Where NZGeoid2016 is the reference surface for the New Zealand Vertical Datum 2016 (NZVD2016), while the BLF55NZVD2016 grid models the difference between the Bluff 1955 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodeticservices/coordinateconversion/convertingbetweennzvd2016nzgd2000andlocalverticaldatums).

The LTN37NZGD2000 grid enables the conversion of normalorthometric heights from the Lyttelton 1937 local vertical datum directly to New Zealand Geodetic Datum 2000 (NZGD2000) ellipsoidal heights. LTN37NZGD2000 is published on a one arcminute grid (approximately 1.8 kilometres) extending over the benchmarks that nominally define the extent of the Lyttelton 1937 vertical datum (168.53° E to 174.2° E, 41.3° S to 45.1° S). The conversion value is represented by the attribute “delta”, in metres. This grid is a combination of New Zealand Quasigeoid 2016 [NZGeoid2016](https://data.linz.govt.nz/layer/3418) and the [LTN37NZVD2016](https://data.linz.govt.nz/layer/3432) height conversion grid. Where NZGeoid2016 is the reference surface for the New Zealand Vertical Datum 2016 (NZVD2016), while the LTN37NZVD2016 grid models the difference between the Lyttelton 1937 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. More information on converting heights between vertical datums can be found [on the LINZ website](http://www.linz.govt.nz/data/geodeticservices/coordinateconversion/convertingbetweennzvd2016nzgd2000andlocalverticaldatums).