EPSG:4175

Sierra Leone 1968

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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: degree (supplier to define representation)

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: 2004-01-06

Scope: Geodesy.

Remarks: Replaces Sierra Leone 1960. The 1968 readjustment coordinates are within 3m of the 1960 provisional adjustment.

Area of use: Sierra Leone - onshore.

Coordinate system: Ellipsoidal 2D CS. Axes: latitude, longitude. Orientations: north, east. UoM: degree

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Center coordinates
-11.8 8.44

WGS84 bounds:
-13.35 6.88
-10.26 10.0

Sierra Leone - onshore.
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Definition: OGC Well Known Text

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"]]

Definition: OGC Well Known Text 2 (2019)

GEOGCRS["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]],
    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["Geodesy."],
        AREA["Sierra Leone - onshore."],
        BBOX[6.88,-13.35,10,-10.26]],
    ID["EPSG",4175]]

Definition: ESRI Well Known Text

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]]

Definition: PROJ.4

+proj=longlat +a=6378249.145 +rf=293.465 +towgs84=-88,4,101,0,0,0,0 +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4175","+proj=longlat +a=6378249.145 +rf=293.465 +towgs84=-88,4,101,0,0,0,0 +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeographicCRS",
    "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"
            }
        ]
    },
    "scope": "Geodesy.",
    "area": "Sierra Leone - onshore.",
    "bbox": {
        "south_latitude": 6.88,
        "west_longitude": -13.35,
        "north_latitude": 10,
        "east_longitude": -10.26
    },
    "id": {
        "authority": "EPSG",
        "code": 4175
    }
}

Definition: GeoServer

4175=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"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"a=6378249.145"
	"rf=293.465"
	"towgs84=-88,4,101,0,0,0,0"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

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

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4175, 'EPSG', 4175, '+proj=longlat +a=6378249.145 +rf=293.465 +towgs84=-88,4,101,0,0,0,0 +no_defs +type=crs', '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"]]');