location
Type of resources
Available actions
Topics
Keywords
Contact for the resource
Provided by
Years
Formats
Representation types
Update frequencies
status
Scale
Resolution

The DBL60NZVD2016 grid enables the conversion of normalorthometric heights from the DunedinBluff 1960 local vertical datum to the New Zealand Vertical Datum 2016 (NZVD2016). The conversion value is represented by the attribute “O”, in metres. This conversion and NZVD2016 are formally defined in the LINZ standard [LINZS25009](http://www.linz.govt.nz/regulatory/25009). DBL60NZVD2016 is published on a two arcminute grid (approximately 3.6 kilometres) extending over the benchmarks that nominally define the extent of the DunedinBluff 1960 vertical datum (167.4° E to 169.9° E, 45.0° S to 46.7° S). The height conversion grid models the difference between the DunedinBluff 1960 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. From the GPSlevelling marks the expected accuracy of DBL60NZVD2016 is better than 2 centimetres (95% Confidence interval). 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 STI77NZGD2000 grid enables the conversion of normalorthometric heights from the Stewart Island 1977 local vertical datum directly to New Zealand Geodetic Datum 2000 (NZGD2000) ellipsoidal heights. STI77NZGD2000 is published on a one arcminute grid (approximately 1.8 kilometres) extending over the benchmarks that nominally define the extent of the Stewart Island 1977 vertical datum (167.2° E to 168.8° E, 46.5° S to 47.5° 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 [STI77NZVD2016](https://data.linz.govt.nz/layer/3442) height conversion grid. Where NZGeoid2016 is the reference surface for the New Zealand Vertical Datum 2016 (NZVD2016), while the STI77NZVD2016 grid models the difference between the Stewart Island 1977 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 Nelson 1955 to NZVD2016 Conversion Raster provides users with a two arcminute (approximately 3.6 kilometres) raster image of the conversion of normalorthometric heights from the Nelson 1955 local vertical datum to the New Zealand Vertical Datum 2016 (NZVD2016). The conversion value is represented by the attribute “O”, in metres. This conversion and NZVD2016 are formally defined in the LINZ standard [LINZS25009](http://www.linz.govt.nz/regulatory/25009). The height conversion grid models the difference between the Nelson 1955 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. From the GPSlevelling marks the expected accuracy is better than 2 centimetres (95% Confidence interval). 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 NPR62NZVD2016 grid enables the conversion of normalorthometric heights from the Napier 1962 local vertical datum to the New Zealand Vertical Datum 2016 (NZVD2016). The conversion value is represented by the attribute “O”, in metres. This conversion and NZVD2016 are formally defined in the LINZ standard [LINZS25009](http://www.linz.govt.nz/regulatory/25009). NPR62NZVD2016 is published on a two arcminute grid (approximately 3.6 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 height conversion grid models the difference between the Napier 1962 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. From the GPSlevelling marks the expected accuracy of NPR62NZVD2016 is better than 2 centimetres (95% Confidence interval). 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 DBL60NZVD2016 grid enables the conversion of normalorthometric heights from the DunedinBluff 1960 local vertical datum to the New Zealand Vertical Datum 2016 (NZVD2016). The conversion value is represented by the attribute “O”, in metres. This conversion and NZVD2016 are formally defined in the LINZ standard [LINZS25009](http://www.linz.govt.nz/regulatory/25009). DBL60NZVD2016 is published on a two arcminute grid (approximately 3.6 kilometres) extending over the benchmarks that nominally define the extent of the DunedinBluff 1960 vertical datum (167.4° E to 169.9° E, 45.0° S to 46.7° S). The height conversion grid models the difference between the DunedinBluff 1960 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. From the GPSlevelling marks the expected accuracy of DBL60NZVD2016 is better than 2 centimetres (95% Confidence interval). 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 NSN55NZVD2016 grid enables the conversion of normalorthometric heights from the Nelson 1955 local vertical datum to the New Zealand Vertical Datum 2016 (NZVD2016). The conversion value is represented by the attribute “O”, in metres. This conversion and NZVD2016 are formally defined in the LINZ standard [LINZS25009](http://www.linz.govt.nz/regulatory/25009). NSN55NZVD2016 is published on a two arcminute grid (approximately 3.6 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 height conversion grid models the difference between the Nelson 1955 vertical datum and NZVD2016 using the LINZ GPSlevelling marks. From the GPSlevelling marks the expected accuracy of NSN55NZVD2016 is better than 2 centimetres (95% Confidence interval). 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 relationship between the GRS80 ellipsoid and the New Zealand Vertical Datum 2016 (NZVD2016) is modelled by the New Zealand Quasigeoid 2016 (NZGeoid2016). The relationship value is represented by the attribute “N”, in metres. This relationship and NZVD2016 is formally defined in the LINZ standard [LINZS25009](http://www.linz.govt.nz/regulatory/25009). NZGeoid2016 can be used to convert New Zealand Geodetic Datum 2000 (NZGD2000) ellipsoidal heights to NZVD2016 normalorthometric heights. The conversion value is represented by the attribute “N”, in metres. NZGeoid2016 is published on a one arcminute grid (approximately 1.8 kilometres) over the New Zealand continental shelf (160° E to 170° W, 25° S to 60° S). NZGeoid2016 was calculated by enhancing the EIGEN6C4 global gravity model with, terrestrial, shiptrack, satellite and airborne gravity data. GPSlevelling observations were not used to compute NZGeoid2016. **Users may also be interested in transforming heights to any of the 13 historic local vertical datums used in New Zealand using the appropriate datum relationship grid displayed in the [NZ Height Conversion Index](http://data.linz.govt.nz/layer/3419).** More information on these transformations is available [on the LINZ website](http://www.linz.govt.nz/data/geodeticservices/coordinateconversion/convertingbetweennzvd2016nzgd2000andlocalverticaldatums).

This layer provides polygons of approximate flood areas derived from Sentinel1 satellite radar imagery captured at various times on 14/02/2023 near the peak of the Cyclone Gabrielle event in the North Island of New Zealand. Areas of coverage include the Hauraki, ThamesCoromandel and Hastings Districts, and Napier City. This dataset was created by Toitū Te Whenua LINZ as part of its contribution to the emergency response, and is limited to areas that had a satellite pass over, and to the few areas of interest as we knew them at the time. **Accuracy** A subjective threshold was used to determine possible flood areas and eliminate false positives. Polygons in hilly areas or below a certain area size were excluded as likely false positives. Please use this data as advisory only. The results have not been ground truthed and will contain errors and ommissions.