{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"GeographicCRS","name":"Unknown datum based upon the Average Terrestrial System 1977 ellipsoid","datum":{"type":"GeodeticReferenceFrame","name":"Not specified (based on Average Terrestrial System 1977 ellipsoid)","ellipsoid":{"name":"Average Terrestrial System 1977","semi_major_axis":6378135,"inverse_flattening":298.257}},"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":4041},"remarks":"Use only in cases where geodetic datum is unknown."}