EPSG:2159

Sierra Leone 1924 / New Colony Grid

Attributes

Unit: Gold Coast foot

Geodetic CRS: Sierra Leone 1924

Datum: Sierra Leone Colony 1924

Ellipsoid: War Office

Prime meridian: Greenwich

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.

Area of use: Sierra Leone - Freetown Peninsula.

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

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SimpleMap

Center coordinates
53753.07 642312.01

Projected bounds:
15664.39 600462.07
91819.62 684175.57

WGS84 bounds:
-13.34 8.32
-13.13 8.55

Sierra Leone - Freetown Peninsula.
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Definition: OGC Well Known Text

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"]]

Definition: OGC Well Known Text 2 (2019)

PROJCRS["Sierra Leone 1924 / New Colony Grid",
    BASEGEOGCRS["Sierra Leone 1924",
        DATUM["Sierra Leone Colony 1924",
            ELLIPSOID["War Office",6378300,296,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,
            ANGLEUNIT["degree",0.0174532925199433]],
        ID["EPSG",4174]],
    CONVERSION["Sierra Leone New Colony Grid",
        METHOD["Transverse Mercator",
            ID["EPSG",9807]],
        PARAMETER["Latitude of natural origin",6.66666666666667,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8801]],
        PARAMETER["Longitude of natural origin",-12,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8802]],
        PARAMETER["Scale factor at natural origin",1,
            SCALEUNIT["unity",1],
            ID["EPSG",8805]],
        PARAMETER["False easting",500000,
            LENGTHUNIT["Gold Coast foot",0.304799710181509],
            ID["EPSG",8806]],
        PARAMETER["False northing",0,
            LENGTHUNIT["Gold Coast foot",0.304799710181509],
            ID["EPSG",8807]]],
    CS[Cartesian,2],
        AXIS["(E)",east,
            ORDER[1],
            LENGTHUNIT["Gold Coast foot",0.304799710181509]],
        AXIS["(N)",north,
            ORDER[2],
            LENGTHUNIT["Gold Coast foot",0.304799710181509]],
    USAGE[
        SCOPE["Engineering survey, topographic mapping."],
        AREA["Sierra Leone - Freetown Peninsula."],
        BBOX[8.32,-13.34,8.55,-13.13]],
    ID["EPSG",2159]]

Definition: ESRI Well Known Text

PROJCS["Sierra_Leone_1924_New_Colony_Grid",
    GEOGCS["GCS_Sierra_Leone_1924",
        DATUM["D_Sierra_Leone_1924",
            SPHEROID["War_Office",6378300.0,296.0]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["False_Easting",500000.0],
    PARAMETER["False_Northing",0.0],
    PARAMETER["Central_Meridian",-12.0],
    PARAMETER["Scale_Factor",1.0],
    PARAMETER["Latitude_Of_Origin",6.66666666666667],
    UNIT["Gold Coast foot",0.304799710181509]]

Definition: 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

Definition: JavaScript (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");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "ProjectedCRS",
    "name": "Sierra Leone 1924 / New Colony Grid",
    "base_crs": {
        "name": "Sierra Leone 1924",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Sierra Leone Colony 1924",
            "ellipsoid": {
                "name": "War Office",
                "semi_major_axis": 6378300,
                "inverse_flattening": 296
            }
        },
        "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": 4174
        }
    },
    "conversion": {
        "name": "Sierra Leone New Colony Grid",
        "method": {
            "name": "Transverse Mercator",
            "id": {
                "authority": "EPSG",
                "code": 9807
            }
        },
        "parameters": [
            {
                "name": "Latitude of natural origin",
                "value": 6.66666666666667,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8801
                }
            },
            {
                "name": "Longitude of natural origin",
                "value": -12,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8802
                }
            },
            {
                "name": "Scale factor at natural origin",
                "value": 1,
                "unit": "unity",
                "id": {
                    "authority": "EPSG",
                    "code": 8805
                }
            },
            {
                "name": "False easting",
                "value": 500000,
                "unit": {
                    "type": "LinearUnit",
                    "name": "Gold Coast foot",
                    "conversion_factor": 0.304799710181509
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8806
                }
            },
            {
                "name": "False northing",
                "value": 0,
                "unit": {
                    "type": "LinearUnit",
                    "name": "Gold Coast foot",
                    "conversion_factor": 0.304799710181509
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8807
                }
            }
        ]
    },
    "coordinate_system": {
        "subtype": "Cartesian",
        "axis": [
            {
                "name": "Easting",
                "abbreviation": "E",
                "direction": "east",
                "unit": {
                    "type": "LinearUnit",
                    "name": "Gold Coast foot",
                    "conversion_factor": 0.304799710181509
                }
            },
            {
                "name": "Northing",
                "abbreviation": "N",
                "direction": "north",
                "unit": {
                    "type": "LinearUnit",
                    "name": "Gold Coast foot",
                    "conversion_factor": 0.304799710181509
                }
            }
        ]
    },
    "scope": "Engineering survey, topographic mapping.",
    "area": "Sierra Leone - Freetown Peninsula.",
    "bbox": {
        "south_latitude": 8.32,
        "west_longitude": -13.34,
        "north_latitude": 8.55,
        "east_longitude": -13.13
    },
    "id": {
        "authority": "EPSG",
        "code": 2159
    }
}

Definition: 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"]]

Definition: MapServer - MAPfile

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

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+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">
	<Layer srs="+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">
	</Layer>
</Map>

Definition: SQL (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"]]');