EPSG:2159 — Sierra Leone 1924 / New Colony Grid

Projected · Sierra Leone - Freetown Peninsula

Export Formats

OGC WKT

PROJCS[
    "Sierra Leone 1924 / New Colony Grid",
    GEOGCS[
        "Sierra Leone 1924",
        DATUM[
            "Sierra_Leone_Colony_1924",
            SPHEROID["War Office",6378300,296,AUTHORITY["EPSG","7029"]],
            AUTHORITY["EPSG","6174"]
        ],
        PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4174"]
    ],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",6.66666666666667],
    PARAMETER["central_meridian",-12],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",500000],
    PARAMETER["false_northing",0],
    UNIT["Gold Coast foot",0.304799710181509,AUTHORITY["EPSG","9094"]],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","2159"]
]

WKT2

PROJCRS[
    "Sierra Leone 1924 / New Colony Grid",
    BASEGEOGCRS[
        "Sierra Leone 1924",
        DATUM[
            "Sierra Leone Colony 1924",
            ELLIPSOID[
                "War Office",
                6378300,
                296,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7029]
            ],
            ID["EPSG",6174]
        ],
        ID["EPSG",4174]
    ],
    CONVERSION[
        "Sierra Leone New Colony Grid",
        METHOD["Transverse Mercator",ID["EPSG",9807]],
        PARAMETER[
            "Latitude of natural origin",
            6.66666666666695,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8801]
        ],
        PARAMETER[
            "Longitude of natural origin",
            -12,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8802]
        ],
        PARAMETER[
            "Scale factor at natural origin",
            1,
            SCALEUNIT["unity",1,ID["EPSG",9201]],
            ID["EPSG",8805]
        ],
        PARAMETER[
            "False easting",
            500000,
            LENGTHUNIT["Gold Coast foot",0.304799710181509,ID["EPSG",9094]],
            ID["EPSG",8806]
        ],
        PARAMETER[
            "False northing",
            0,
            LENGTHUNIT["Gold Coast foot",0.304799710181509,ID["EPSG",9094]],
            ID["EPSG",8807]
        ],
        ID["EPSG",19963]
    ],
    CS[Cartesian,2,ID["EPSG",4404]],
    AXIS["Easting (E)",east],
    AXIS["Northing (N)",north],
    LENGTHUNIT["Gold Coast foot",0.304799710181509,ID["EPSG",9094]],
    ID["EPSG",2159]
]

PROJ.4

+proj=tmerc +lat_0=6.66666666666667 +lon_0=-12 +k=1 +x_0=152399.855090754 +y_0=0 +a=6378300 +rf=296 +to_meter=0.304799710181509 +no_defs +type=crs

Proj4js

How to add a projection to Proj4js? →

proj4.defs("EPSG:2159", "+proj=tmerc +lat_0=6.66666666666667 +lon_0=-12 +k=1 +x_0=152399.855090754 +y_0=0 +a=6378300 +rf=296 +to_meter=0.304799710181509 +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 2159,
  "name": "Sierra Leone 1924 / New Colony Grid",
  "kind": "projected",
  "area": "Sierra Leone - Freetown Peninsula",
  "unit": "Gold Coast foot",
  "bbox": [
    8.32,
    -13.34,
    8.55,
    -13.13
  ],
  "proj4": "+proj=tmerc +lat_0=6.66666666666667 +lon_0=-12 +k=1 +x_0=152399.855090754 +y_0=0 +a=6378300 +rf=296 +to_meter=0.304799710181509 +no_defs +type=crs"
}

PostGIS

How to add a projection to PostGIS? →

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (2159, 'EPSG', 2159, '+proj=tmerc +lat_0=6.66666666666667 +lon_0=-12 +k=1 +x_0=152399.855090754 +y_0=0 +a=6378300 +rf=296 +to_meter=0.304799710181509 +no_defs +type=crs', 'PROJCS["Sierra Leone 1924 / New Colony Grid",GEOGCS["Sierra Leone 1924",DATUM["Sierra_Leone_Colony_1924",SPHEROID["War Office",6378300,296,AUTHORITY["EPSG","7029"]],AUTHORITY["EPSG","6174"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4174"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",6.66666666666667],PARAMETER["central_meridian",-12],PARAMETER["scale_factor",1],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Gold Coast foot",0.304799710181509,AUTHORITY["EPSG","9094"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","2159"]]');

MapServer

How to add a projection to MapServer? →

PROJECTION
  "+proj=tmerc"
  "+lat_0=6.66666666666667"
  "+lon_0=-12"
  "+k=1"
  "+x_0=152399.855090754"
  "+y_0=0"
  "+a=6378300"
  "+rf=296"
  "+to_meter=0.304799710181509"
  "+no_defs"
  "+type=crs"
END

GeoServer

How to add a projection to GeoServer? →

2159=PROJCS["Sierra Leone 1924 / New Colony Grid",GEOGCS["Sierra Leone 1924",DATUM["Sierra_Leone_Colony_1924",SPHEROID["War Office",6378300,296,AUTHORITY["EPSG","7029"]],AUTHORITY["EPSG","6174"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4174"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",6.66666666666667],PARAMETER["central_meridian",-12],PARAMETER["scale_factor",1],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Gold Coast foot",0.304799710181509,AUTHORITY["EPSG","9094"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","2159"]]

Other CRS using Sierra Leone Colony 1924

Frequently Asked Questions

How do I add EPSG:2159 to GeoServer?

Add the following definition to your GeoServer configuration:

2159=PROJCS["Sierra Leone 1924 / New Colony Grid",GEOGCS["Sierra Leone 1924",DATUM["Sierra_Leone_Colony_1924",SPHEROID["War Office",6378300,296,AUTHORITY["EPSG","7029"]],AUTHORITY["EPSG","6174"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4174"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",6.66666666666667],PARAMETER["central_meridian",-12],PARAMETER["scale_factor",1],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Gold Coast foot",0.304799710181509,AUTHORITY["EPSG","9094"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","2159"]]

Read the full GeoServer guide →

How do I add EPSG:2159 to PostGIS?

Add the following definition to your PostGIS configuration:

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (2159, 'EPSG', 2159, '+proj=tmerc +lat_0=6.66666666666667 +lon_0=-12 +k=1 +x_0=152399.855090754 +y_0=0 +a=6378300 +rf=296 +to_meter=0.304799710181509 +no_defs +type=crs', 'PROJCS["Sierra Leone 1924 / New Colony Grid",GEOGCS["Sierra Leone 1924",DATUM["Sierra_Leone_Colony_1924",SPHEROID["War Office",6378300,296,AUTHORITY["EPSG","7029"]],AUTHORITY["EPSG","6174"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4174"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",6.66666666666667],PARAMETER["central_meridian",-12],PARAMETER["scale_factor",1],PARAMETER["false_easting",500000],PARAMETER["false_northing",0],UNIT["Gold Coast foot",0.304799710181509,AUTHORITY["EPSG","9094"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","2159"]]');

Read the full PostGIS guide →

How do I add EPSG:2159 to MapServer?

Add the following definition to your MapServer configuration:

PROJECTION
  "+proj=tmerc"
  "+lat_0=6.66666666666667"
  "+lon_0=-12"
  "+k=1"
  "+x_0=152399.855090754"
  "+y_0=0"
  "+a=6378300"
  "+rf=296"
  "+to_meter=0.304799710181509"
  "+no_defs"
  "+type=crs"
END

Read the full MapServer guide →

How do I use EPSG:2159 with Proj4js?

Add the following definition to your Proj4js configuration:

proj4.defs("EPSG:2159", "+proj=tmerc +lat_0=6.66666666666667 +lon_0=-12 +k=1 +x_0=152399.855090754 +y_0=0 +a=6378300 +rf=296 +to_meter=0.304799710181509 +no_defs +type=crs");

Read the full Proj4js guide →

Type

Projected

Unit

Gold Coast foot

Geodetic CRS

Sierra Leone 1924

Datum

Sierra Leone Colony 1924

Ellipsoid

War Office

Prime Meridian

Greenwich

Area of Use

Sierra Leone - Freetown Peninsula

Sierra Leone - Freetown Peninsula.

Coordinate System

Cartesian 2D CS. Axes: easting, northing (E,N). Orientations: east, north. UoM: ftGC.

Center Coordinates

53753.07 642312.01

Projected Bounds

683932.40 15664.3991819.62 600698.88

WGS84 Bounds

8.55 -13.34-13.13 8.32

Data Source

EPSG

Information Source

Ordnance Survey International

Revision Date

2001-06-05

Scope

Engineering survey, topographic mapping.

Remarks

Replaces the Sierra Leone 1924 / Colony Grid. New grid is 422.3 ft west and 112.1 ft south of old grid. Ellipsoid semi-major axis (a)=20926201 Gold Coast feet; 1 Gold Coast foot = 0.3047997101815 m.

EPSG

2159