EPSG:29901

OSNI 1952 / Irish National Grid

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

Selected transformation

Method: Position Vector transformation (geog2D domain)

Remarks: Parameter values from TM75 to ETRS89 (2) (code 1953). Assumes each pair of (i) OSNI 1952 and TM75, and (ii) ETRS89 and WGS 84, can be considered the same to within the accuracy of the transformation.

Information source: OGP

Revision date: 2020-03-14

Attributes

Unit: metre

Geodetic CRS: OSNI 1952

Datum: OSNI 1952

Ellipsoid: Airy 1830

Prime meridian: Greenwich

Data source: EPSG

Information source: Ordnance Survey of Northern Ireland.

Revision date: 2001-11-06

Scope: Engineering survey, topographic mapping.

Remarks: Not used in Republic of Ireland. Replaced in 1975 by TM75 / Irish Grid (CRS code 29903).

Area of use: United Kingdom (UK) - Northern Ireland (Ulster) - onshore.

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

Center coordinates
280071.4 379804.09

Projected bounds:
188233.38 301191.9
368729.33 460249.96

WGS84 bounds:
-8.18 53.96
-5.34 55.36

United Kingdom (UK) - Northern Ireland (Ulster) - onshore.
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Definition: Well Known Text (WKT)

PROJCS["OSNI 1952 / Irish National Grid",
    GEOGCS["OSNI 1952",
        DATUM["OSNI_1952",
            SPHEROID["Airy 1830",6377563.396,299.3249646],
            TOWGS84[482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.14999999998]],
        PRIMEM["Greenwich",0],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4188"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",53.5],
    PARAMETER["central_meridian",-8],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",200000],
    PARAMETER["false_northing",250000],
    UNIT["metre",1],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","29901"]]

Definition: ESRI WKT

PROJCS["OSNI_1952_Irish_National_Grid",GEOGCS["GCS_OSNI_1952",DATUM["D_OSNI_1952",SPHEROID["Airy_1830",6377563.396,299.3249646]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["False_Easting",200000.0],PARAMETER["False_Northing",250000.0],PARAMETER["Central_Meridian",-8.0],PARAMETER["Scale_Factor",1.0],PARAMETER["Latitude_Of_Origin",53.5],UNIT["Meter",1.0]]

Definition: PROJ.4

+proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1 +x_0=200000 +y_0=250000 +ellps=airy +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.14999999998456 +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:29901","+proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1 +x_0=200000 +y_0=250000 +ellps=airy +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.14999999998456 +units=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.4/projjson.schema.json",
    "type": "ProjectedCRS",
    "name": "OSNI 1952 / Irish National Grid",
    "base_crs": {
        "name": "OSNI 1952",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "OSNI 1952",
            "ellipsoid": {
                "name": "Airy 1830",
                "semi_major_axis": 6377563.396,
                "inverse_flattening": 299.3249646
            }
        },
        "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": 4188
        }
    },
    "conversion": {
        "name": "Irish National Grid",
        "method": {
            "name": "Transverse Mercator",
            "id": {
                "authority": "EPSG",
                "code": 9807
            }
        },
        "parameters": [
            {
                "name": "Latitude of natural origin",
                "value": 53.5,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8801
                }
            },
            {
                "name": "Longitude of natural origin",
                "value": -8,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8802
                }
            },
            {
                "name": "Scale factor at natural origin",
                "value": 1,
                "unit": "unity",
                "id": {
                    "authority": "EPSG",
                    "code": 8805
                }
            },
            {
                "name": "False easting",
                "value": 200000,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8806
                }
            },
            {
                "name": "False northing",
                "value": 250000,
                "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": "United Kingdom (UK) - Northern Ireland (Ulster) - onshore.",
    "bbox": {
        "south_latitude": 53.96,
        "west_longitude": -8.18,
        "north_latitude": 55.36,
        "east_longitude": -5.34
    },
    "id": {
        "authority": "EPSG",
        "code": 29901
    }
}

Definition: GeoServer

29901=PROJCS["OSNI 1952 / Irish National Grid",GEOGCS["OSNI 1952",DATUM["OSNI_1952",SPHEROID["Airy 1830",6377563.396,299.3249646],TOWGS84[482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.14999999998]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4188"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",53.5],PARAMETER["central_meridian",-8],PARAMETER["scale_factor",1],PARAMETER["false_easting",200000],PARAMETER["false_northing",250000],UNIT["metre",1],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","29901"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=tmerc"
	"lat_0=53.5"
	"lon_0=-8"
	"k=1"
	"x_0=200000"
	"y_0=250000"
	"ellps=airy"
	"towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.14999999998456"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1 +x_0=200000 +y_0=250000 +ellps=airy +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.14999999998456 +units=m +no_defs +type=crs">
	<Layer srs="+proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1 +x_0=200000 +y_0=250000 +ellps=airy +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.14999999998456 +units=m +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 29901, 'EPSG', 29901, '+proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1 +x_0=200000 +y_0=250000 +ellps=airy +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.14999999998456 +units=m +no_defs +type=crs', 'PROJCS["OSNI 1952 / Irish National Grid",GEOGCS["OSNI 1952",DATUM["OSNI_1952",SPHEROID["Airy 1830",6377563.396,299.3249646],TOWGS84[482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.14999999998]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4188"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",53.5],PARAMETER["central_meridian",-8],PARAMETER["scale_factor",1],PARAMETER["false_easting",200000],PARAMETER["false_northing",250000],UNIT["metre",1],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","29901"]]');

Definition: OGC WKT

PROJCS["OSNI 1952 / Irish National Grid",GEOGCS["OSNI 1952",DATUM["OSNI_1952",SPHEROID["Airy 1830",6377563.396,299.3249646],TOWGS84[482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.14999999998]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4188"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",53.5],PARAMETER["central_meridian",-8],PARAMETER["scale_factor",1],PARAMETER["false_easting",200000],PARAMETER["false_northing",250000],UNIT["metre",1],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","29901"]]

Definition: OGC WKT 2 (2019)

PROJCRS["OSNI 1952 / Irish National Grid",BASEGEOGCRS["OSNI 1952",DATUM["OSNI 1952",ELLIPSOID["Airy 1830",6377563.396,299.3249646,LENGTHUNIT["metre",1]]],PRIMEM["Greenwich",0,ANGLEUNIT["degree",0.0174532925199433]],ID["EPSG",4188]],CONVERSION["Irish National Grid",METHOD["Transverse Mercator",ID["EPSG",9807]],PARAMETER["Latitude of natural origin",53.5,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8801]],PARAMETER["Longitude of natural origin",-8,ANGLEUNIT["degree",0.0174532925199433],ID["EPSG",8802]],PARAMETER["Scale factor at natural origin",1,SCALEUNIT["unity",1],ID["EPSG",8805]],PARAMETER["False easting",200000,LENGTHUNIT["metre",1],ID["EPSG",8806]],PARAMETER["False northing",250000,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["United Kingdom (UK) - Northern Ireland (Ulster) - onshore."],BBOX[53.96,-8.18,55.36,-5.34]],ID["EPSG",29901]]