{"$schema":"https://proj.org/schemas/v0.7/projjson.schema.json","type":"ProjectedCRS","name":"Kertau (RSO) / RSO Malaya (ch)","base_crs":{"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"}]},"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)."},"conversion":{"name":"Rectified Skew Orthomorphic Malaya Grid (chain)","method":{"name":"Hotine Oblique Mercator (variant A)","id":{"authority":"EPSG","code":9812}},"parameters":[{"name":"Latitude of projection centre","value":4,"unit":"degree","id":{"authority":"EPSG","code":8811}},{"name":"Longitude of projection centre","value":102.25,"unit":"degree","id":{"authority":"EPSG","code":8812}},{"name":"Azimuth at projection centre","value":323.0257905,"unit":"degree","id":{"authority":"EPSG","code":8813}},{"name":"Angle from Rectified to Skew Grid","value":323.130102361111,"unit":"degree","id":{"authority":"EPSG","code":8814}},{"name":"Scale factor at projection centre","value":0.99984,"unit":"unity","id":{"authority":"EPSG","code":8815}},{"name":"False easting","value":40000,"unit":{"type":"LinearUnit","name":"British chain (Sears 1922 truncated)","conversion_factor":20.116756},"id":{"authority":"EPSG","code":8806}},{"name":"False northing","value":0,"unit":{"type":"LinearUnit","name":"British chain (Sears 1922 truncated)","conversion_factor":20.116756},"id":{"authority":"EPSG","code":8807}}]},"coordinate_system":{"subtype":"Cartesian","axis":[{"name":"Easting","abbreviation":"E","direction":"east","unit":{"type":"LinearUnit","name":"British chain (Sears 1922 truncated)","conversion_factor":20.116756}},{"name":"Northing","abbreviation":"N","direction":"north","unit":{"type":"LinearUnit","name":"British chain (Sears 1922 truncated)","conversion_factor":20.116756}}]},"scope":"Engineering survey, topographic mapping.","area":"Malaysia - West Malaysia onshore.","bbox":{"south_latitude":1.21,"west_longitude":99.59,"north_latitude":6.72,"east_longitude":104.6},"id":{"authority":"EPSG","code":3167}}