{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"VerticalCRS","name":"HKPD height","datum":{"type":"VerticalReferenceFrame","name":"Hong Kong Principal Datum"},"coordinate_system":{"subtype":"vertical","axis":[{"name":"Gravity-related height","abbreviation":"H","direction":"up","unit":"metre"}]},"scope":"Geodesy, engineering survey, topographic mapping.","area":"Hong Kong - onshore.","bbox":{"south_latitude":22.19,"west_longitude":113.82,"north_latitude":22.56,"east_longitude":114.39},"id":{"authority":"EPSG","code":5738}}