EPSG:29903

TM75 / Irish Grid

Available transformations
to EPSG:4326
EPSG:4326 - WGS 84

Selected transformation

Method: General polynomial of degree 6

Remarks: Parameter values taken from TM75 to ETRS89 (1) (code 1041) assuming that ETRS89 is coincident with WGS 84 within the accuracy of the transformation. Use iteration for reverse transformation WGS 84 to TM75. May be emulated by NTv2 alternative code 6947.

Information source: OGP

Revision date: 2020-03-14

Attributes

Unit: metre

Geodetic CRS: TM75

Datum: Geodetic Datum of 1965

Ellipsoid: Airy Modified 1849

Prime meridian: Greenwich

Data source: EPSG

Information source: Ordnance Survey of Ireland

Revision date: 2001-11-06

Scope: Engineering survey, topographic mapping.

Remarks: Replaces both OSNI 1952 / Irish National Grid (code 29901) and TM65 / Irish Grid (code 29902) from 1975. Replaced by IRENET95 / Irish Transverse Mercator (code 2157) from 1/1/2001.

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

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

Covered area powered by MapTiler MapTiler logo
SimpleMap

Center coordinates
203374.16 239960.74

Projected bounds:
21861.71 15177.48
385198.22 468039.71

WGS84 bounds:
-10.56 51.39
-5.34 55.43

Ireland - onshore. United Kingdom (UK) - Northern Ireland (Ulster) - onshore.
MapTiler banner

Definition: OGC Well Known Text

PROJCS["TM75 / Irish Grid",
    GEOGCS["TM75",
        DATUM["Geodetic_Datum_of_1965",
            SPHEROID["Airy Modified 1849",6377340.189,299.3249646,
                AUTHORITY["EPSG","7002"]],
            AUTHORITY["EPSG","6300"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4300"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",53.5],
    PARAMETER["central_meridian",-8],
    PARAMETER["scale_factor",1.000035],
    PARAMETER["false_easting",200000],
    PARAMETER["false_northing",250000],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","29903"]]

Definition: OGC Well Known Text 2 (2019)

PROJCRS["TM75 / Irish Grid",
    BASEGEOGCRS["TM75",
        DATUM["Geodetic Datum of 1965",
            ELLIPSOID["Airy Modified 1849",6377340.189,299.3249646,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,
            ANGLEUNIT["degree",0.0174532925199433]],
        ID["EPSG",4300]],
    CONVERSION["Irish 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",1.000035,
            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["Ireland - onshore. United Kingdom (UK) - Northern Ireland (Ulster) - onshore."],
        BBOX[51.39,-10.56,55.43,-5.34]],
    ID["EPSG",29903]]

Definition: ESRI Well Known Text

PROJCS["TM75_Irish_Grid",
    GEOGCS["GCS_TM75",
        DATUM["D_TM75",
            SPHEROID["Airy_Modified",6377340.189,299.3249646]],
        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",1.000035],
    PARAMETER["Latitude_Of_Origin",53.5],
    UNIT["Meter",1.0]]

Definition: PROJ.4

+proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1.000035 +x_0=200000 +y_0=250000 +a=6377340.189 +rf=299.3249646 +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:29903","+proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1.000035 +x_0=200000 +y_0=250000 +a=6377340.189 +rf=299.3249646 +units=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "ProjectedCRS",
    "name": "TM75 / Irish Grid",
    "base_crs": {
        "name": "TM75",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Geodetic Datum of 1965",
            "ellipsoid": {
                "name": "Airy Modified 1849",
                "semi_major_axis": 6377340.189,
                "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": 4300
        }
    },
    "conversion": {
        "name": "Irish 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": 1.000035,
                "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": "Ireland - onshore. United Kingdom (UK) - Northern Ireland (Ulster) - onshore.",
    "bbox": {
        "south_latitude": 51.39,
        "west_longitude": -10.56,
        "north_latitude": 55.43,
        "east_longitude": -5.34
    },
    "id": {
        "authority": "EPSG",
        "code": 29903
    }
}

Definition: GeoServer

29903=PROJCS["TM75 / Irish Grid",GEOGCS["TM75",DATUM["Geodetic_Datum_of_1965",SPHEROID["Airy Modified 1849",6377340.189,299.3249646,AUTHORITY["EPSG","7002"]],AUTHORITY["EPSG","6300"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4300"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",53.5],PARAMETER["central_meridian",-8],PARAMETER["scale_factor",1.000035],PARAMETER["false_easting",200000],PARAMETER["false_northing",250000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","29903"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=tmerc"
	"lat_0=53.5"
	"lon_0=-8"
	"k=1.000035"
	"x_0=200000"
	"y_0=250000"
	"a=6377340.189"
	"rf=299.3249646"
	"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=1.000035 +x_0=200000 +y_0=250000 +a=6377340.189 +rf=299.3249646 +units=m +no_defs +type=crs">
	<Layer srs="+proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1.000035 +x_0=200000 +y_0=250000 +a=6377340.189 +rf=299.3249646 +units=m +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 29903, 'EPSG', 29903, '+proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1.000035 +x_0=200000 +y_0=250000 +a=6377340.189 +rf=299.3249646 +units=m +no_defs +type=crs', 'PROJCS["TM75 / Irish Grid",GEOGCS["TM75",DATUM["Geodetic_Datum_of_1965",SPHEROID["Airy Modified 1849",6377340.189,299.3249646,AUTHORITY["EPSG","7002"]],AUTHORITY["EPSG","6300"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4300"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",53.5],PARAMETER["central_meridian",-8],PARAMETER["scale_factor",1.000035],PARAMETER["false_easting",200000],PARAMETER["false_northing",250000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","29903"]]');