EPSG:4256

Mahe 1971

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

  • Seychelles - Mahe Island. , accuracy 44.0 m, code 1164 (default) [3]

Selected transformation

Name: Mahe 1971 to WGS 84 (1)

Method: Geocentric translations (geog2D domain)

Remarks: Derived at 1 station. Accuracy 25m in each axis.

Information source: U.S. Defense Mapping Agency TR8350.2 September 1987.

Revision date: 2020-03-14

Attributes

Unit: degree (supplier to define representation)

Geodetic CRS: Mahe 1971

Datum: Mahe 1971

Ellipsoid: Clarke 1880 (RGS)

Prime meridian: Greenwich

Data source: EPSG

Information source: U.S. Defense Mapping Agency TR8350.2 rev 3, January 2000. http://earth-info.nga.mil/GandG/tr8350/tr8350_2.html

Revision date: 2014-09-08

Scope: Military survey.

Remarks: This CRS has no known local application. South East Island 1943 (CRS codes 6892 and 6915) is used for topographic mapping, cadastral and hydrographic survey.

Area of use: Seychelles - Mahe Island.

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

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Center coordinates
55.45 -4.68

WGS84 bounds:
55.3 -4.86
55.59 -4.5

Seychelles - Mahe Island.
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Definition: OGC Well Known Text

GEOGCS["Mahe 1971",
    DATUM["Mahe_1971",
        SPHEROID["Clarke 1880 (RGS)",6378249.145,293.465],
        TOWGS84[41,-220,-134,0,0,0,0]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]],
    UNIT["degree",0.0174532925199433,
        AUTHORITY["EPSG","9122"]],
    AUTHORITY["EPSG","4256"]]

Definition: OGC Well Known Text 2 (2019)

GEOGCRS["Mahe 1971",
    DATUM["Mahe 1971",
        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["Military survey."],
        AREA["Seychelles - Mahe Island."],
        BBOX[-4.86,55.3,-4.5,55.59]],
    ID["EPSG",4256]]

Definition: ESRI Well Known Text

GEOGCS["GCS_Mahe_1971",
    DATUM["D_Mahe_1971",
        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=41,-220,-134,0,0,0,0 +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4256","+proj=longlat +a=6378249.145 +rf=293.465 +towgs84=41,-220,-134,0,0,0,0 +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeographicCRS",
    "name": "Mahe 1971",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Mahe 1971",
        "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": "Military survey.",
    "area": "Seychelles - Mahe Island.",
    "bbox": {
        "south_latitude": -4.86,
        "west_longitude": 55.3,
        "north_latitude": -4.5,
        "east_longitude": 55.59
    },
    "id": {
        "authority": "EPSG",
        "code": 4256
    }
}

Definition: GeoServer

4256=GEOGCS["Mahe 1971",DATUM["Mahe_1971",SPHEROID["Clarke 1880 (RGS)",6378249.145,293.465],TOWGS84[41,-220,-134,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4256"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"a=6378249.145"
	"rf=293.465"
	"towgs84=41,-220,-134,0,0,0,0"
	"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=41,-220,-134,0,0,0,0 +no_defs +type=crs">
	<Layer srs="+proj=longlat +a=6378249.145 +rf=293.465 +towgs84=41,-220,-134,0,0,0,0 +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4256, 'EPSG', 4256, '+proj=longlat +a=6378249.145 +rf=293.465 +towgs84=41,-220,-134,0,0,0,0 +no_defs +type=crs', 'GEOGCS["Mahe 1971",DATUM["Mahe_1971",SPHEROID["Clarke 1880 (RGS)",6378249.145,293.465],TOWGS84[41,-220,-134,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4256"]]');