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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
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.
&stroke=red&width=2&path=1.4,-3.79|6.06,-3.79|6.06,2.1|1.4,2.1|1.4,-3.79)
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
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: 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: 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"]]');
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