EPSG:31028 — Yoff / UTM zone 28N

PROJCRS[
    "Yoff / UTM zone 28N",
    BASEGEOGCRS[
        "Yoff",
        DATUM[
            "Yoff",
            ELLIPSOID[
                "Clarke 1880 (IGN)",
                6378249.2,
                293.466021293627,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7011]
            ],
            ID["EPSG",6310]
        ],
        ID["EPSG",4310]
    ],
    CONVERSION[
        "UTM zone 28N",
        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",
            -15,
            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",16028]
    ],
    CS[Cartesian,2,ID["EPSG",4400]],
    AXIS["Easting (E)",east],
    AXIS["Northing (N)",north],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",31028]
]

+proj=utm +zone=28 +ellps=clrk80ign +towgs84=-30,190,89,0,0,0,0 +units=m +no_defs +type=crs

proj4.defs("EPSG:31028", "+proj=utm +zone=28 +ellps=clrk80ign +towgs84=-30,190,89,0,0,0,0 +units=m +no_defs +type=crs");

{
  "type": "CoordinateReferenceSystem",
  "code": 31028,
  "name": "Yoff / UTM zone 28N",
  "kind": "projected",
  "area": "Senegal",
  "unit": "metre",
  "bbox": [
    10.64,
    -20.22,
    16.7,
    -11.36
  ],
  "proj4": "+proj=utm +zone=28 +ellps=clrk80ign +towgs84=-30,190,89,0,0,0,0 +units=m +no_defs +type=crs"
}

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (31028, 'EPSG', 31028, '+proj=utm +zone=28 +ellps=clrk80ign +towgs84=-30,190,89,0,0,0,0 +units=m +no_defs +type=crs', 'PROJCS["Yoff / UTM zone 28N",GEOGCS["Yoff",DATUM["Yoff",SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627],TOWGS84[-30,190,89,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4310"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-15],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","31028"]]');

PROJECTION
  "+proj=utm"
  "+zone=28"
  "+ellps=clrk80ign"
  "+towgs84=-30,190,89,0,0,0,0"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

31028=PROJCS["Yoff / UTM zone 28N",GEOGCS["Yoff",DATUM["Yoff",SPHEROID["Clarke 1880 (IGN)",6378249.2,293.466021293627],TOWGS84[-30,190,89,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4310"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_meridian",-15],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","31028"]]