{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"VerticalCRS","name":"Hon Dau 1992 height","datum":{"type":"VerticalReferenceFrame","name":"Hon Dau 1992"},"coordinate_system":{"subtype":"vertical","axis":[{"name":"Gravity-related height","abbreviation":"H","direction":"up","unit":"metre"}]},"scope":"Geodesy, engineering survey.","area":"Vietnam - mainland onshore.","bbox":{"south_latitude":8.33,"west_longitude":102.14,"north_latitude":23.4,"east_longitude":109.53},"id":{"authority":"EPSG","code":5727}}