{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"GeographicCRS","name":"SAD69","datum":{"type":"GeodeticReferenceFrame","name":"South American Datum 1969","ellipsoid":{"name":"GRS 1967","semi_major_axis":6378160,"inverse_flattening":298.247167427}},"coordinate_system":{"subtype":"ellipsoidal","axis":[{"name":"Geodetic latitude","abbreviation":"Lat","direction":"north","unit":{"type":"AngularUnit","name":"degree minute second hemisphere","conversion_factor":0.0174532925199433}},{"name":"Geodetic longitude","abbreviation":"Long","direction":"east","unit":{"type":"AngularUnit","name":"degree minute second hemisphere","conversion_factor":0.0174532925199433}}]},"scope":"Geodesy.","area":"Brazil - onshore and offshore. In rest of South America - onshore north of approximately 45°S and Tierra del Fuego.","bbox":{"south_latitude":-55.96,"west_longitude":-91.72,"north_latitude":12.52,"east_longitude":-25.28},"id":{"authority":"EPSG","code":4291},"remarks":"Uses GRS67 ellipsoid with 1/f to exactly 2 decimal places. Precision of ellipsoid entry increased from 2 to 5 dp with change id 97.251. Error introduced if not using the truncated precision is 0 to 31mm."}