EPSG:2161

Sierra Leone 1968 / UTM zone 28N

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Available transformations
to EPSG:4326
No other targets exist for this CRS

  • Sierra Leone - onshore. , accuracy 26.0 m, code 1614 (default) [3]

Selected transformation

Method: Geocentric translations (geog2D domain)

Remarks: Determined at 8 stations, accuracy +/- 15m in each axis. Info. Source has the source CRS as Sierra Leone 1960. Sierra Leone 1968 is a readjustment of the 1960 network: coordinates changed by less than 3 metres.

Information source: NIMA TR8350.2 revision 3, 1997.

Revision date: 2020-03-14

Attributes

Unit: metre

Geodetic CRS: Sierra Leone 1968

Datum: Sierra Leone 1968

Ellipsoid: Clarke 1880 (RGS)

Prime meridian: Greenwich

Data source: EPSG

Information source: Ordnance Survey International

Revision date: 2001-06-05

Scope: Engineering survey, topographic mapping.

Remarks: Replaces Sierra Leone 1960 / UTM zone 28N. The 1968 readjustment coordinates are within 3m of the 1960 provisional adjustment.

Area of use: Sierra Leone - onshore west of 12°W.

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

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Center coordinates
851895.12 934285.8

Projected bounds:
680876.12 760700.56
1024277.28 1109058.89

WGS84 bounds:
-13.35 6.88
-10.26 10.0

Sierra Leone - onshore.
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Definition: OGC Well Known Text

PROJCS["Sierra Leone 1968 / UTM zone 28N",
    GEOGCS["Sierra Leone 1968",
        DATUM["Sierra_Leone_1968",
            SPHEROID["Clarke 1880 (RGS)",6378249.145,293.465],
            TOWGS84[-88,4,101,0,0,0,0]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4175"]],
    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","2161"]]

Definition: OGC Well Known Text 2 (2019)

PROJCRS["Sierra Leone 1968 / UTM zone 28N",
    BASEGEOGCRS["Sierra Leone 1968",
        DATUM["Sierra Leone 1968",
            ELLIPSOID["Clarke 1880 (RGS)",6378249.145,293.465,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,
            ANGLEUNIT["degree",0.0174532925199433]],
        ID["EPSG",4175]],
    CONVERSION["UTM zone 28N",
        METHOD["Transverse Mercator",
            ID["EPSG",9807]],
        PARAMETER["Latitude of natural origin",0,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8801]],
        PARAMETER["Longitude of natural origin",-15,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8802]],
        PARAMETER["Scale factor at natural origin",0.9996,
            SCALEUNIT["unity",1],
            ID["EPSG",8805]],
        PARAMETER["False easting",500000,
            LENGTHUNIT["metre",1],
            ID["EPSG",8806]],
        PARAMETER["False northing",0,
            LENGTHUNIT["metre",1],
            ID["EPSG",8807]]],
    CS[Cartesian,2],
        AXIS["(E)",east,
            ORDER[1],
            LENGTHUNIT["metre",1]],
        AXIS["(N)",north,
            ORDER[2],
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["Engineering survey, topographic mapping."],
        AREA["Sierra Leone - onshore west of 12°W."],
        BBOX[7.15,-13.35,9.94,-12]],
    ID["EPSG",2161]]

Definition: ESRI Well Known Text

PROJCS["Sierra_Leone_1968_UTM_Zone_28N",
    GEOGCS["GCS_Sierra_Leone_1968",
        DATUM["D_Sierra_Leone_1968",
            SPHEROID["Clarke_1880_RGS",6378249.145,293.465]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["False_Easting",500000.0],
    PARAMETER["False_Northing",0.0],
    PARAMETER["Central_Meridian",-15.0],
    PARAMETER["Scale_Factor",0.9996],
    PARAMETER["Latitude_Of_Origin",0.0],
    UNIT["Meter",1.0]]

Definition: PROJ.4

+proj=utm +zone=28 +a=6378249.145 +rf=293.465 +towgs84=-88,4,101,0,0,0,0 +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:2161","+proj=utm +zone=28 +a=6378249.145 +rf=293.465 +towgs84=-88,4,101,0,0,0,0 +units=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "ProjectedCRS",
    "name": "Sierra Leone 1968 / UTM zone 28N",
    "base_crs": {
        "name": "Sierra Leone 1968",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Sierra Leone 1968",
            "ellipsoid": {
                "name": "Clarke 1880 (RGS)",
                "semi_major_axis": 6378249.145,
                "inverse_flattening": 293.465
            }
        },
        "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": 4175
        }
    },
    "conversion": {
        "name": "UTM zone 28N",
        "method": {
            "name": "Transverse Mercator",
            "id": {
                "authority": "EPSG",
                "code": 9807
            }
        },
        "parameters": [
            {
                "name": "Latitude of natural origin",
                "value": 0,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8801
                }
            },
            {
                "name": "Longitude of natural origin",
                "value": -15,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8802
                }
            },
            {
                "name": "Scale factor at natural origin",
                "value": 0.9996,
                "unit": "unity",
                "id": {
                    "authority": "EPSG",
                    "code": 8805
                }
            },
            {
                "name": "False easting",
                "value": 500000,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8806
                }
            },
            {
                "name": "False northing",
                "value": 0,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8807
                }
            }
        ]
    },
    "coordinate_system": {
        "subtype": "Cartesian",
        "axis": [
            {
                "name": "Easting",
                "abbreviation": "E",
                "direction": "east",
                "unit": "metre"
            },
            {
                "name": "Northing",
                "abbreviation": "N",
                "direction": "north",
                "unit": "metre"
            }
        ]
    },
    "scope": "Engineering survey, topographic mapping.",
    "area": "Sierra Leone - onshore west of 12°W.",
    "bbox": {
        "south_latitude": 7.15,
        "west_longitude": -13.35,
        "north_latitude": 9.94,
        "east_longitude": -12
    },
    "id": {
        "authority": "EPSG",
        "code": 2161
    }
}

Definition: GeoServer

2161=PROJCS["Sierra Leone 1968 / UTM zone 28N",GEOGCS["Sierra Leone 1968",DATUM["Sierra_Leone_1968",SPHEROID["Clarke 1880 (RGS)",6378249.145,293.465],TOWGS84[-88,4,101,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4175"]],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","2161"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=utm"
	"zone=28"
	"a=6378249.145"
	"rf=293.465"
	"towgs84=-88,4,101,0,0,0,0"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=utm +zone=28 +a=6378249.145 +rf=293.465 +towgs84=-88,4,101,0,0,0,0 +units=m +no_defs +type=crs">
	<Layer srs="+proj=utm +zone=28 +a=6378249.145 +rf=293.465 +towgs84=-88,4,101,0,0,0,0 +units=m +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 2161, 'EPSG', 2161, '+proj=utm +zone=28 +a=6378249.145 +rf=293.465 +towgs84=-88,4,101,0,0,0,0 +units=m +no_defs +type=crs', 'PROJCS["Sierra Leone 1968 / UTM zone 28N",GEOGCS["Sierra Leone 1968",DATUM["Sierra_Leone_1968",SPHEROID["Clarke 1880 (RGS)",6378249.145,293.465],TOWGS84[-88,4,101,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4175"]],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","2161"]]');