EPSG:2136

Accra / Ghana National Grid

Transform Get position on a map

Available transformations
to EPSG:4326
EPSG:4326 - WGS 84

Selected transformation

Method: Position Vector transformation (geog2D domain)

Remarks: Derived via WGS 72BE. Found in use within oil industry erroneously concatenated via WGS 72. See tfm code 8571.

Information source: OGP

Revision date: 2020-03-14

Attributes

Unit: Gold Coast foot

Geodetic CRS: Accra

Datum: Accra

Ellipsoid: War Office

Prime meridian: Greenwich

Data source: EPSG

Information source: Ordnance Survey International

Revision date: 2023-11-19

Scope: Engineering survey, topographic mapping.

Remarks: Ellipsoid semi-major axis (a)=20926201 Gold Coast feet. ProjCRS sometimes found in metric form: 1 Gold Coast foot = 0.3047997101815 m. Replaced by Leigon / Ghana Metric Grid from 1978.

Area of use: Ghana - onshore.

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

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SimpleMap

Center coordinates
956347.02 -340752.4

Projected bounds:
-118946.35 -1185834.03
2031994.74 507583.51

WGS84 bounds:
-3.79 1.4
2.1 6.06

Ghana - offshore.
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Definition: OGC Well Known Text

PROJCS["Accra / Ghana National Grid",
    GEOGCS["Accra",
        DATUM["Accra",
            SPHEROID["War Office",6378300,296],
            TOWGS84[-171.16,17.29,325.21,0,0,0.814,-0.38]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4168"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",4.66666666666667],
    PARAMETER["central_meridian",-1],
    PARAMETER["scale_factor",0.99975],
    PARAMETER["false_easting",900000],
    PARAMETER["false_northing",0],
    UNIT["Gold Coast foot",0.304799710181509],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","2136"]]

Definition: OGC Well Known Text 2 (2019)

BOUNDCRS[
    SOURCECRS[
        PROJCRS["Accra / Ghana National Grid",
            BASEGEOGCRS["Accra",
                DATUM["Accra",
                    ELLIPSOID["War Office",6378300,296,
                        LENGTHUNIT["metre",1]]],
                PRIMEM["Greenwich",0,
                    ANGLEUNIT["degree",0.0174532925199433]],
                ID["EPSG",4168]],
            CONVERSION["Ghana National Grid",
                METHOD["Transverse Mercator",
                    ID["EPSG",9807]],
                PARAMETER["Latitude of natural origin",4.66666666666667,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8801]],
                PARAMETER["Longitude of natural origin",-1,
                    ANGLEUNIT["degree",0.0174532925199433],
                    ID["EPSG",8802]],
                PARAMETER["Scale factor at natural origin",0.99975,
                    SCALEUNIT["unity",1],
                    ID["EPSG",8805]],
                PARAMETER["False easting",900000,
                    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["Ghana - onshore."],
                BBOX[4.67,-3.25,11.16,1.23]],
            ID["EPSG",2136]]],
    TARGETCRS[
        GEOGCRS["WGS 84",
            ENSEMBLE["World Geodetic System 1984 ensemble",
                MEMBER["World Geodetic System 1984 (Transit)"],
                MEMBER["World Geodetic System 1984 (G730)"],
                MEMBER["World Geodetic System 1984 (G873)"],
                MEMBER["World Geodetic System 1984 (G1150)"],
                MEMBER["World Geodetic System 1984 (G1674)"],
                MEMBER["World Geodetic System 1984 (G1762)"],
                MEMBER["World Geodetic System 1984 (G2139)"],
                ELLIPSOID["WGS 84",6378137,298.257223563,
                    LENGTHUNIT["metre",1]],
                ENSEMBLEACCURACY[2.0]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            CS[ellipsoidal,2],
                AXIS["geodetic latitude (Lat)",north,
                    ORDER[1],
                    ANGLEUNIT["degree",0.0174532925199433]],
                AXIS["geodetic longitude (Lon)",east,
                    ORDER[2],
                    ANGLEUNIT["degree",0.0174532925199433]],
            USAGE[
                SCOPE["Horizontal component of 3D system."],
                AREA["World."],
                BBOX[-90,-180,90,180]],
            ID["EPSG",4326]]],
    ABRIDGEDTRANSFORMATION["Transformation from unknown to WGS84",
        METHOD["Position Vector transformation (geog2D domain)",
            ID["EPSG",9606]],
        PARAMETER["X-axis translation",-171.16,
            ID["EPSG",8605]],
        PARAMETER["Y-axis translation",17.29,
            ID["EPSG",8606]],
        PARAMETER["Z-axis translation",325.21,
            ID["EPSG",8607]],
        PARAMETER["X-axis rotation",0,
            ID["EPSG",8608]],
        PARAMETER["Y-axis rotation",0,
            ID["EPSG",8609]],
        PARAMETER["Z-axis rotation",0.814,
            ID["EPSG",8610]],
        PARAMETER["Scale difference",0.99999962,
            ID["EPSG",8611]]]]

Definition: ESRI Well Known Text

PROJCS["Accra_Ghana_Grid",
    GEOGCS["GCS_Accra",
        DATUM["D_Accra",
            SPHEROID["War_Office",6378300.0,296.0]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["False_Easting",900000.0],
    PARAMETER["False_Northing",0.0],
    PARAMETER["Central_Meridian",-1.0],
    PARAMETER["Scale_Factor",0.99975],
    PARAMETER["Latitude_Of_Origin",4.66666666666667],
    UNIT["Gold Coast foot",0.304799710181509]]

Definition: PROJ.4

+proj=tmerc +lat_0=4.66666666666667 +lon_0=-1 +k=0.99975 +x_0=274319.739163358 +y_0=0 +a=6378300 +rf=296 +towgs84=-171.16,17.29,325.21,0,0,0.814,-0.38 +to_meter=0.304799710181509 +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:2136","+proj=tmerc +lat_0=4.66666666666667 +lon_0=-1 +k=0.99975 +x_0=274319.739163358 +y_0=0 +a=6378300 +rf=296 +towgs84=-171.16,17.29,325.21,0,0,0.814,-0.38 +to_meter=0.304799710181509 +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "BoundCRS",
    "source_crs": {
        "type": "ProjectedCRS",
        "name": "Accra / Ghana National Grid",
        "base_crs": {
            "name": "Accra",
            "datum": {
                "type": "GeodeticReferenceFrame",
                "name": "Accra",
                "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": 4168
            }
        },
        "conversion": {
            "name": "Ghana National Grid",
            "method": {
                "name": "Transverse Mercator",
                "id": {
                    "authority": "EPSG",
                    "code": 9807
                }
            },
            "parameters": [
                {
                    "name": "Latitude of natural origin",
                    "value": 4.66666666666667,
                    "unit": "degree",
                    "id": {
                        "authority": "EPSG",
                        "code": 8801
                    }
                },
                {
                    "name": "Longitude of natural origin",
                    "value": -1,
                    "unit": "degree",
                    "id": {
                        "authority": "EPSG",
                        "code": 8802
                    }
                },
                {
                    "name": "Scale factor at natural origin",
                    "value": 0.99975,
                    "unit": "unity",
                    "id": {
                        "authority": "EPSG",
                        "code": 8805
                    }
                },
                {
                    "name": "False easting",
                    "value": 900000,
                    "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
                    }
                }
            ]
        },
        "id": {
            "authority": "EPSG",
            "code": 2136
        }
    },
    "target_crs": {
        "type": "GeographicCRS",
        "name": "WGS 84",
        "datum_ensemble": {
            "name": "World Geodetic System 1984 ensemble",
            "members": [
                {
                    "name": "World Geodetic System 1984 (Transit)",
                    "id": {
                        "authority": "EPSG",
                        "code": 1166
                    }
                },
                {
                    "name": "World Geodetic System 1984 (G730)",
                    "id": {
                        "authority": "EPSG",
                        "code": 1152
                    }
                },
                {
                    "name": "World Geodetic System 1984 (G873)",
                    "id": {
                        "authority": "EPSG",
                        "code": 1153
                    }
                },
                {
                    "name": "World Geodetic System 1984 (G1150)",
                    "id": {
                        "authority": "EPSG",
                        "code": 1154
                    }
                },
                {
                    "name": "World Geodetic System 1984 (G1674)",
                    "id": {
                        "authority": "EPSG",
                        "code": 1155
                    }
                },
                {
                    "name": "World Geodetic System 1984 (G1762)",
                    "id": {
                        "authority": "EPSG",
                        "code": 1156
                    }
                },
                {
                    "name": "World Geodetic System 1984 (G2139)",
                    "id": {
                        "authority": "EPSG",
                        "code": 1309
                    }
                }
            ],
            "ellipsoid": {
                "name": "WGS 84",
                "semi_major_axis": 6378137,
                "inverse_flattening": 298.257223563
            },
            "accuracy": "2.0",
            "id": {
                "authority": "EPSG",
                "code": 6326
            }
        },
        "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": 4326
        }
    },
    "transformation": {
        "name": "Transformation from unknown to WGS84",
        "method": {
            "name": "Position Vector transformation (geog2D domain)",
            "id": {
                "authority": "EPSG",
                "code": 9606
            }
        },
        "parameters": [
            {
                "name": "X-axis translation",
                "value": -171.16,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8605
                }
            },
            {
                "name": "Y-axis translation",
                "value": 17.29,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8606
                }
            },
            {
                "name": "Z-axis translation",
                "value": 325.21,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8607
                }
            },
            {
                "name": "X-axis rotation",
                "value": 0,
                "unit": {
                    "type": "AngularUnit",
                    "name": "arc-second",
                    "conversion_factor": 4.84813681109536e-06
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8608
                }
            },
            {
                "name": "Y-axis rotation",
                "value": 0,
                "unit": {
                    "type": "AngularUnit",
                    "name": "arc-second",
                    "conversion_factor": 4.84813681109536e-06
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8609
                }
            },
            {
                "name": "Z-axis rotation",
                "value": 0.814,
                "unit": {
                    "type": "AngularUnit",
                    "name": "arc-second",
                    "conversion_factor": 4.84813681109536e-06
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8610
                }
            },
            {
                "name": "Scale difference",
                "value": -0.38,
                "unit": {
                    "type": "ScaleUnit",
                    "name": "parts per million",
                    "conversion_factor": 1e-06
                },
                "id": {
                    "authority": "EPSG",
                    "code": 8611
                }
            }
        ]
    }
}

Definition: GeoServer

2136=PROJCS["Accra / Ghana National Grid",GEOGCS["Accra",DATUM["Accra",SPHEROID["War Office",6378300,296],TOWGS84[-171.16,17.29,325.21,0,0,0.814,-0.38]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4168"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",4.66666666666667],PARAMETER["central_meridian",-1],PARAMETER["scale_factor",0.99975],PARAMETER["false_easting",900000],PARAMETER["false_northing",0],UNIT["Gold Coast foot",0.304799710181509],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","2136"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=tmerc"
	"lat_0=4.66666666666667"
	"lon_0=-1"
	"k=0.99975"
	"x_0=274319.739163358"
	"y_0=0"
	"a=6378300"
	"rf=296"
	"towgs84=-171.16,17.29,325.21,0,0,0.814,-0.38"
	"to_meter=0.304799710181509"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=tmerc +lat_0=4.66666666666667 +lon_0=-1 +k=0.99975 +x_0=274319.739163358 +y_0=0 +a=6378300 +rf=296 +towgs84=-171.16,17.29,325.21,0,0,0.814,-0.38 +to_meter=0.304799710181509 +no_defs +type=crs">
	<Layer srs="+proj=tmerc +lat_0=4.66666666666667 +lon_0=-1 +k=0.99975 +x_0=274319.739163358 +y_0=0 +a=6378300 +rf=296 +towgs84=-171.16,17.29,325.21,0,0,0.814,-0.38 +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 ( 2136, 'EPSG', 2136, '+proj=tmerc +lat_0=4.66666666666667 +lon_0=-1 +k=0.99975 +x_0=274319.739163358 +y_0=0 +a=6378300 +rf=296 +towgs84=-171.16,17.29,325.21,0,0,0.814,-0.38 +to_meter=0.304799710181509 +no_defs +type=crs', 'PROJCS["Accra / Ghana National Grid",GEOGCS["Accra",DATUM["Accra",SPHEROID["War Office",6378300,296],TOWGS84[-171.16,17.29,325.21,0,0,0.814,-0.38]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4168"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",4.66666666666667],PARAMETER["central_meridian",-1],PARAMETER["scale_factor",0.99975],PARAMETER["false_easting",900000],PARAMETER["false_northing",0],UNIT["Gold Coast foot",0.304799710181509],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","2136"]]');