EPSG:4712

Ascension Island 1958

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

  • St Helena, Ascension and Tristan da Cunha , accuracy 44.0 m, code 15797 (default) [3]

Selected transformation

Method: Geocentric translations (geog2D domain)

Remarks: Derived at 2 satellite stations. Accuracy 25m in each axis.

Information source: DMA / NIMA / NGA TR8350.2 (3rd edition, Amendment 1, 3 January 2000)

Revision date: 2020-03-14

Attributes

Unit: degree (supplier to define representation)

Geodetic CRS: Ascension Island 1958

Datum: Ascension Island 1958

Ellipsoid: International 1924

Prime meridian: Greenwich

Data source: EPSG

Information source: DMA / NIMA / NGA TR8350.2 (3rd edition, January 2000).

Revision date: 2006-01-26

Scope: Military survey.

Area of use: St Helena, Ascension and Tristan da Cunha - Ascension Island - onshore.

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

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SimpleMap

Center coordinates
-14.35 -7.93

WGS84 bounds:
-14.46 -8.03
-14.24 -7.83

St Helena, Ascension and Tristan da Cunha - Ascension Island - onshore.
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Definition: OGC Well Known Text

GEOGCS["Ascension Island 1958",
    DATUM["Ascension_Island_1958",
        SPHEROID["International 1924",6378388,297],
        TOWGS84[-205,107,53,0,0,0,0]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]],
    UNIT["degree",0.0174532925199433,
        AUTHORITY["EPSG","9122"]],
    AUTHORITY["EPSG","4712"]]

Definition: OGC Well Known Text 2 (2019)

GEOGCRS["Ascension Island 1958",
    DATUM["Ascension Island 1958",
        ELLIPSOID["International 1924",6378388,297,
            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["St Helena, Ascension and Tristan da Cunha - Ascension Island - onshore."],
        BBOX[-8.03,-14.46,-7.83,-14.24]],
    ID["EPSG",4712]]

Definition: ESRI Well Known Text

GEOGCS["GCS_Ascension_Island_1958",
    DATUM["D_Ascension_Island_1958",
        SPHEROID["International_1924",6378388.0,297.0]],
    PRIMEM["Greenwich",0.0],
    UNIT["Degree",0.0174532925199433]]

Definition: PROJ.4

+proj=longlat +ellps=intl +towgs84=-205,107,53,0,0,0,0 +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4712","+proj=longlat +ellps=intl +towgs84=-205,107,53,0,0,0,0 +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeographicCRS",
    "name": "Ascension Island 1958",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "Ascension Island 1958",
        "ellipsoid": {
            "name": "International 1924",
            "semi_major_axis": 6378388,
            "inverse_flattening": 297
        }
    },
    "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": "St Helena, Ascension and Tristan da Cunha - Ascension Island - onshore.",
    "bbox": {
        "south_latitude": -8.03,
        "west_longitude": -14.46,
        "north_latitude": -7.83,
        "east_longitude": -14.24
    },
    "id": {
        "authority": "EPSG",
        "code": 4712
    }
}

Definition: GeoServer

4712=GEOGCS["Ascension Island 1958",DATUM["Ascension_Island_1958",SPHEROID["International 1924",6378388,297],TOWGS84[-205,107,53,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4712"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"ellps=intl"
	"towgs84=-205,107,53,0,0,0,0"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=intl +towgs84=-205,107,53,0,0,0,0 +no_defs +type=crs">
	<Layer srs="+proj=longlat +ellps=intl +towgs84=-205,107,53,0,0,0,0 +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4712, 'EPSG', 4712, '+proj=longlat +ellps=intl +towgs84=-205,107,53,0,0,0,0 +no_defs +type=crs', 'GEOGCS["Ascension Island 1958",DATUM["Ascension_Island_1958",SPHEROID["International 1924",6378388,297],TOWGS84[-205,107,53,0,0,0,0]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4712"]]');