{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"GeographicCRS","name":"Kertau (RSO)","datum":{"type":"GeodeticReferenceFrame","name":"Kertau (RSO)","ellipsoid":{"name":"Everest 1830 (RSO 1969)","semi_major_axis":6377295.664,"inverse_flattening":300.8017}},"coordinate_system":{"subtype":"ellipsoidal","axis":[{"name":"Geodetic latitude","abbreviation":"Lat","direction":"north","unit":"degree"},{"name":"Geodetic longitude","abbreviation":"Lon","direction":"east","unit":"degree"}]},"scope":"Metrication of RSO grid.","area":"Malaysia - West Malaysia; Singapore.","bbox":{"south_latitude":1.13,"west_longitude":99.59,"north_latitude":6.72,"east_longitude":104.6},"id":{"authority":"EPSG","code":4751},"remarks":"Used only for metrication of RSO grid. See Kertau 1968 (CRS code 4245) for other purposes. Replaced by GDM2000 (CRS code 4742)."}