{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"VerticalCRS","name":"NAVD88 height (ft)","datum":{"type":"VerticalReferenceFrame","name":"North American Vertical Datum 1988"},"coordinate_system":{"subtype":"vertical","axis":[{"name":"Gravity-related height","abbreviation":"H","direction":"up","unit":{"type":"LinearUnit","name":"foot","conversion_factor":0.3048}}]},"scope":"Engineering survey, GIS, topographic mapping.","area":"United States (USA) - onshore - Arizona; Michigan; Montana; North Dakota; Oregon; South Carolina.","bbox":{"south_latitude":31.33,"west_longitude":-124.6,"north_latitude":49.01,"east_longitude":-78.52},"id":{"authority":"EPSG","code":8228}}