{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"VerticalCRS","name":"MSL depth (ft)","datum":{"type":"VerticalReferenceFrame","name":"Mean Sea Level"},"coordinate_system":{"subtype":"vertical","axis":[{"name":"Depth","abbreviation":"D","direction":"down","unit":{"type":"LinearUnit","name":"foot","conversion_factor":0.3048}}]},"scope":"Hydrography, drilling.","area":"World.","bbox":{"south_latitude":-90,"west_longitude":-180,"north_latitude":90,"east_longitude":180},"id":{"authority":"EPSG","code":8051}}