EPSG:29903 — TM75 / Irish Grid

Projected · Europe - Ireland (Republic and Ulster) - onshore

Export Formats

OGC WKT

PROJCS[
    "TM75 / Irish Grid",
    GEOGCS[
        "TM75",
        DATUM[
            "Geodetic_Datum_of_1965",
            SPHEROID["Airy Modified 1849",6377340.189,299.3249646],
            TOWGS84[482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15]
        ],
        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"]
]

WKT2

PROJCRS[
    "TM75 / Irish Grid",
    BASEGEOGCRS[
        "TM75",
        DATUM[
            "Geodetic Datum of 1965",
            ELLIPSOID[
                "Airy Modified 1849",
                6377340.189,
                299.3249646,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7002]
            ],
            ID["EPSG",6300]
        ],
        ID["EPSG",4300]
    ],
    CONVERSION[
        "Irish Grid",
        METHOD["Transverse Mercator",ID["EPSG",9807]],
        PARAMETER[
            "Latitude of natural origin",
            53.5000000000003,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8801]
        ],
        PARAMETER[
            "Longitude of natural origin",
            -8,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8802]
        ],
        PARAMETER[
            "Scale factor at natural origin",
            1.000035,
            SCALEUNIT["unity",1,ID["EPSG",9201]],
            ID["EPSG",8805]
        ],
        PARAMETER[
            "False easting",
            200000,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8806]
        ],
        PARAMETER[
            "False northing",
            250000,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8807]
        ],
        ID["EPSG",19972]
    ],
    CS[Cartesian,2,ID["EPSG",4400]],
    AXIS["Easting (E)",east],
    AXIS["Northing (N)",north],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",29903]
]

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 +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15 +units=m +no_defs +type=crs

Proj4js

How to add a projection to 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 +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15 +units=m +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 29903,
  "name": "TM75 / Irish Grid",
  "kind": "projected",
  "area": "Europe - Ireland (Republic and Ulster) - onshore",
  "unit": "metre",
  "bbox": [
    51.39,
    -10.56,
    55.43,
    -5.34
  ],
  "proj4": "+proj=tmerc +lat_0=53.5 +lon_0=-8 +k=1.000035 +x_0=200000 +y_0=250000 +a=6377340.189 +rf=299.3249646 +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15 +units=m +no_defs +type=crs"
}

PostGIS

How to add a projection to 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 +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15 +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],TOWGS84[482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15]],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"]]');

MapServer

How to add a projection to MapServer? →

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"
  "+towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

GeoServer

How to add a projection to GeoServer? →

29903=PROJCS["TM75 / Irish Grid",GEOGCS["TM75",DATUM["Geodetic_Datum_of_1965",SPHEROID["Airy Modified 1849",6377340.189,299.3249646],TOWGS84[482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15]],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"]]

Related Coordinate Systems

Available Transformations (7)

Transformations inherited from base CRS: EPSG:4300 (TM75)

Transformation	Source → Target	Accuracy (m)
TM75 to ETRS89 (1)	4300 → 4258	0.4
TM75 to ETRS89 (3)	4300 → 4258	0.41
TM75 to WGS 84 (1)	4300 → 4326	1
TM75 to ETRS89 (2)	4300 → 4258	1
TM75 to WGS 84 (2)	4300 → 4326	1
TM75 to WGS 84 (4)	4300 → 4326	1
TM75 to WGS 84 (3)	4300 → 4326	6

Other CRS using Geodetic Datum of 1965

Frequently Asked Questions

How do I add EPSG:29903 to GeoServer?

Add the following definition to your GeoServer configuration:

29903=PROJCS["TM75 / Irish Grid",GEOGCS["TM75",DATUM["Geodetic_Datum_of_1965",SPHEROID["Airy Modified 1849",6377340.189,299.3249646],TOWGS84[482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15]],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"]]

Read the full GeoServer guide →

How do I add EPSG:29903 to PostGIS?

Add the following definition to your PostGIS configuration:

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 +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15 +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],TOWGS84[482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15]],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"]]');

Read the full PostGIS guide →

How do I add EPSG:29903 to MapServer?

Add the following definition to your MapServer configuration:

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"
  "+towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

Read the full MapServer guide →

How do I use EPSG:29903 with Proj4js?

Add the following definition to your Proj4js configuration:

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 +towgs84=482.5,-130.6,564.6,-1.042,-0.214,-0.631,8.15 +units=m +no_defs +type=crs");

Read the full Proj4js guide →

Type

Projected

Unit

metre

Geodetic CRS

TM75

Datum

Geodetic Datum of 1965

Ellipsoid

Airy Modified 1849

Prime Meridian

Greenwich

Area of Use

Europe - Ireland (Republic and Ulster) - onshore

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

Coordinate System

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

Center Coordinates

203374.16 239960.74

Projected Bounds

468039.71 21861.71368431.41 18286.84

WGS84 Bounds

55.43 -10.56-5.34 51.39

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.

EPSG

29903