{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"GeographicCRS","name":"Unknown datum based upon the Clarke 1866 Michigan ellipsoid","datum":{"type":"GeodeticReferenceFrame","name":"Not specified (based on Clarke 1866 Michigan ellipsoid)","ellipsoid":{"name":"Clarke 1866 Michigan","semi_major_axis":{"value":20926631.531,"unit":{"type":"LinearUnit","name":"US survey foot","conversion_factor":0.304800609601219}},"semi_minor_axis":{"value":20855688.674,"unit":{"type":"LinearUnit","name":"US survey foot","conversion_factor":0.304800609601219}}}},"coordinate_system":{"subtype":"ellipsoidal","axis":[{"name":"Geodetic latitude","abbreviation":"Lat","direction":"north","unit":"degree"},{"name":"Geodetic longitude","abbreviation":"Lon","direction":"east","unit":"degree"}]},"scope":"Not recommended.","area":"Not specified.","bbox":{"south_latitude":-90,"west_longitude":-180,"north_latitude":90,"east_longitude":180},"id":{"authority":"EPSG","code":4009},"remarks":"Use only in cases where geodetic datum is unknown."}