EPSG:4300

TM75

Available transformations
to EPSG:4258
EPSG:4258 - ETRS89

Selected transformation

Method: General polynomial of degree 6

Remarks: Derived at 183 points, accuracy 0.4m (95%). Use iteration for reverse transformation ETRS89 to TM75. Emulated by NTv2 method (code 6946) and used as approximate CT to WGS 84 (code 1042).

Information source: Ordnance Survey of Great Britain, http://www.gps.gov.uk

Revision date: 2020-03-14

Attributes

Unit: degree (supplier to define representation)

Geodetic CRS: TM75

Datum: Geodetic Datum of 1965

Ellipsoid: Airy Modified 1849

Prime meridian: Greenwich

Data source: EPSG

Information source: "The Irish Grid - A Description of the Co-ordinate Reference System" published by Ordnance Survey of Ireland, Dublin and Ordnance Survey of Northern Ireland, Belfast.

Revision date: 2004-01-06

Scope: Basis for topographic mapping.

Remarks: Uses Geodetic Datum of 1965 which should not be confused with the 1965 adjustment (TM65, datum code 6299 and CRS code 4299). Replaces OSNI52 (CRS code 4188) and TM65 (CRS code 4299). Replaced by IRENET95 (CRS code 4173).

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

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

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Center coordinates
-7.95 53.41

WGS84 bounds:
-10.56 51.39
-5.34 55.43

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

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"]]

Definition: OGC Well Known Text 2 (2019)

GEOGCRS["TM75",
    DATUM["Geodetic Datum of 1965",
        ELLIPSOID["Airy Modified 1849",6377340.189,299.3249646,
            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["Basis for topographic mapping."],
        AREA["Ireland - onshore. United Kingdom (UK) - Northern Ireland (Ulster) - onshore."],
        BBOX[51.39,-10.56,55.43,-5.34]],
    ID["EPSG",4300]]

Definition: ESRI Well Known Text

GEOGCS["GCS_TM75",
    DATUM["D_TM75",
        SPHEROID["Airy_Modified",6377340.189,299.3249646]],
    PRIMEM["Greenwich",0.0],
    UNIT["Degree",0.0174532925199433]]

Definition: PROJ.4

+proj=longlat +a=6377340.189 +rf=299.3249646 +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:4300","+proj=longlat +a=6377340.189 +rf=299.3249646 +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeographicCRS",
    "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"
            }
        ]
    },
    "scope": "Basis for 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": 4300
    }
}

Definition: GeoServer

4300=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"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"a=6377340.189"
	"rf=299.3249646"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +a=6377340.189 +rf=299.3249646 +no_defs +type=crs">
	<Layer srs="+proj=longlat +a=6377340.189 +rf=299.3249646 +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 4300, 'EPSG', 4300, '+proj=longlat +a=6377340.189 +rf=299.3249646 +no_defs +type=crs', '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"]]');