EPSG
Survey and Mapping Office, Lands Department. Http://www.info.gov.hk/landsd/mapping/tindex.htm
2002-06-22
Geodesy, cadastre, engineering survey.
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "VerticalReferenceFrame", "name": "Hong Kong Principal Datum", "scope": "Geodesy, cadastre, engineering survey.", "area": "China - Hong Kong - onshore.", "bbox": { "south_latitude": 22.19, "west_longitude": 113.82, "north_latitude": 22.56, "east_longitude": 114.39 }, "id": { "authority": "EPSG", "code": 5135 } }