{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"VerticalCRS","name":"Lagos 1955 height","datum":{"type":"VerticalReferenceFrame","name":"Lagos 1955"},"coordinate_system":{"subtype":"vertical","axis":[{"name":"Gravity-related height","abbreviation":"H","direction":"up","unit":"metre"}]},"scope":"Geodesy, engineering survey, topographic mapping.","area":"Nigeria - onshore.","bbox":{"south_latitude":4.22,"west_longitude":2.69,"north_latitude":13.9,"east_longitude":14.65},"id":{"authority":"EPSG","code":5796}}