EPSG:29850 — Timbalai 1948 / UTM zone 50N

PROJCRS[
    "Timbalai 1948 / UTM zone 50N",
    BASEGEOGCRS[
        "Timbalai 1948",
        DATUM[
            "Timbalai 1948",
            ELLIPSOID[
                "Everest 1830 (1967 Definition)",
                6377298.556,
                300.8017,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7016]
            ],
            ID["EPSG",6298]
        ],
        ID["EPSG",4298]
    ],
    CONVERSION[
        "UTM zone 50N",
        METHOD["Transverse Mercator",ID["EPSG",9807]],
        PARAMETER[
            "Latitude of natural origin",
            0,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8801]
        ],
        PARAMETER[
            "Longitude of natural origin",
            117,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8802]
        ],
        PARAMETER[
            "Scale factor at natural origin",
            0.9996,
            SCALEUNIT["unity",1,ID["EPSG",9201]],
            ID["EPSG",8805]
        ],
        PARAMETER[
            "False easting",
            500000,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8806]
        ],
        PARAMETER[
            "False northing",
            0,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8807]
        ],
        ID["EPSG",16050]
    ],
    CS[Cartesian,2,ID["EPSG",4400]],
    AXIS["Easting (E)",east],
    AXIS["Northing (N)",north],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",29850]
]

+proj=utm +zone=50 +ellps=evrstSS +towgs84=-679,669,-48,0,0,0,0 +units=m +no_defs +type=crs

proj4.defs("EPSG:29850", "+proj=utm +zone=50 +ellps=evrstSS +towgs84=-679,669,-48,0,0,0,0 +units=m +no_defs +type=crs");

{
  "type": "CoordinateReferenceSystem",
  "code": 29850,
  "name": "Timbalai 1948 / UTM zone 50N",
  "kind": "projected",
  "area": "Asia - Brunei and East Malaysia - 114°E to 120°E",
  "unit": "metre",
  "bbox": [
    1.43,
    114,
    7.67,
    119.61
  ],
  "proj4": "+proj=utm +zone=50 +ellps=evrstSS +towgs84=-679,669,-48,0,0,0,0 +units=m +no_defs +type=crs"
}

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (29850, 'EPSG', 29850, '+proj=utm +zone=50 +ellps=evrstSS +towgs84=-679,669,-48,0,0,0,0 +units=m +no_defs +type=crs', 'PROJCS["Timbalai 1948 / UTM zone 50N",GEOGCS["Timbalai 1948",DATUM["Timbalai_1948",SPHEROID["Everest 1830 (1967 Definition)",6377298.556,300.8017],TOWGS84[-679,669,-48,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4298"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",117],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","29850"]]');

PROJECTION
  "+proj=utm"
  "+zone=50"
  "+ellps=evrstSS"
  "+towgs84=-679,669,-48,0,0,0,0"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

29850=PROJCS["Timbalai 1948 / UTM zone 50N",GEOGCS["Timbalai 1948",DATUM["Timbalai_1948",SPHEROID["Everest 1830 (1967 Definition)",6377298.556,300.8017],TOWGS84[-679,669,-48,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4298"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",117],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","29850"]]