EPSG
Interim Report GEO/T1/19/51 for LINZ by John Hannah, "An Assessment of New Zealand's Height Systems and Options for a Future Height System", January 2001.
2008-04-04
Geodesy, engineering survey, topographic mapping.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "VerticalReferenceFrame", "name": "Stewart Island 1977", "scope": "Geodesy, engineering survey, topographic mapping.", "area": "New Zealand - Stewart Island.", "bbox": { "south_latitude": -47.33, "west_longitude": 167.29, "north_latitude": -46.63, "east_longitude": 168.34 }, "id": { "authority": "EPSG", "code": 5170 } }