EPSG:9741 — EOS21 Grid

Projected · UK - Tweedmouth to Aberdeen

Export Formats

OGC WKT

PROJCS[
    "EOS21 Grid",
    GEOGCS[
        "EOS21-IRF",
        DATUM[
            "EOS21_Intermediate_Reference_Frame",
            SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],
            AUTHORITY["EPSG","1308"]
        ],
        PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","9739"]
    ],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",56.35],
    PARAMETER["central_meridian",-2.75],
    PARAMETER["scale_factor",1],
    PARAMETER["false_easting",74996.927],
    PARAMETER["false_northing",133508.35],
    UNIT["metre",1,AUTHORITY["EPSG","9001"]],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","9741"]
]

WKT2

PROJCRS[
    "EOS21 Grid",
    BASEGEOGCRS[
        "EOS21-IRF",
        DATUM[
            "EOS21 Intermediate Reference Frame",
            ELLIPSOID[
                "GRS 1980",
                6378137,
                298.257222101,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",7019]
            ],
            ID["EPSG",1308]
        ],
        DEFININGTRANSFORMATION[
            "ETRS89-GBR [OSNet v2009] to EOS21-IRF (1)",
            ID["EPSG",9740]
        ],
        ID["EPSG",9739]
    ],
    CONVERSION[
        "EOS21-TM",
        METHOD["Transverse Mercator",ID["EPSG",9807]],
        PARAMETER[
            "Latitude of natural origin",
            56.3500000000003,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8801]
        ],
        PARAMETER[
            "Longitude of natural origin",
            -2.75000000000028,
            ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
            ID["EPSG",8802]
        ],
        PARAMETER[
            "Scale factor at natural origin",
            1,
            SCALEUNIT["unity",1,ID["EPSG",9201]],
            ID["EPSG",8805]
        ],
        PARAMETER[
            "False easting",
            74996.927,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8806]
        ],
        PARAMETER[
            "False northing",
            133508.35,
            LENGTHUNIT["metre",1,ID["EPSG",9001]],
            ID["EPSG",8807]
        ],
        ID["EPSG",9738]
    ],
    CS[Cartesian,2,ID["EPSG",4400]],
    AXIS["Easting (E)",east],
    AXIS["Northing (N)",north],
    LENGTHUNIT["metre",1,ID["EPSG",9001]],
    ID["EPSG",9741]
]

PROJ.4

+proj=tmerc +lat_0=56.35 +lon_0=-2.75 +k=1 +x_0=74996.927 +y_0=133508.35 +ellps=GRS80 +units=m +no_defs +type=crs

Proj4js

How to add a projection to Proj4js? →

proj4.defs("EPSG:9741", "+proj=tmerc +lat_0=56.35 +lon_0=-2.75 +k=1 +x_0=74996.927 +y_0=133508.35 +ellps=GRS80 +units=m +no_defs +type=crs");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 9741,
  "name": "EOS21 Grid",
  "kind": "projected",
  "area": "UK - Tweedmouth to Aberdeen",
  "unit": "metre",
  "bbox": [
    55.55,
    -3.56,
    57.21,
    -1.94
  ],
  "proj4": "+proj=tmerc +lat_0=56.35 +lon_0=-2.75 +k=1 +x_0=74996.927 +y_0=133508.35 +ellps=GRS80 +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 (9741, 'EPSG', 9741, '+proj=tmerc +lat_0=56.35 +lon_0=-2.75 +k=1 +x_0=74996.927 +y_0=133508.35 +ellps=GRS80 +units=m +no_defs +type=crs', 'PROJCS["EOS21 Grid",GEOGCS["EOS21-IRF",DATUM["EOS21_Intermediate_Reference_Frame",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","1308"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","9739"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",56.35],PARAMETER["central_meridian",-2.75],PARAMETER["scale_factor",1],PARAMETER["false_easting",74996.927],PARAMETER["false_northing",133508.35],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","9741"]]');

MapServer

How to add a projection to MapServer? →

PROJECTION
  "+proj=tmerc"
  "+lat_0=56.35"
  "+lon_0=-2.75"
  "+k=1"
  "+x_0=74996.927"
  "+y_0=133508.35"
  "+ellps=GRS80"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

GeoServer

How to add a projection to GeoServer? →

9741=PROJCS["EOS21 Grid",GEOGCS["EOS21-IRF",DATUM["EOS21_Intermediate_Reference_Frame",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","1308"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","9739"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",56.35],PARAMETER["central_meridian",-2.75],PARAMETER["scale_factor",1],PARAMETER["false_easting",74996.927],PARAMETER["false_northing",133508.35],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","9741"]]

Related Coordinate Systems

Available Transformations (1)

Transformations inherited from base CRS: EPSG:9739 (EOS21-IRF)

Transformation	Source → Target	Accuracy (m)
ETRS89-GBR [OSNet v2009] to EOS21-IRF (1)	11009 → 9739	0

Other CRS using EOS21 Intermediate Reference Frame

Frequently Asked Questions

How do I add EPSG:9741 to GeoServer?

Add the following definition to your GeoServer configuration:

9741=PROJCS["EOS21 Grid",GEOGCS["EOS21-IRF",DATUM["EOS21_Intermediate_Reference_Frame",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","1308"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","9739"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",56.35],PARAMETER["central_meridian",-2.75],PARAMETER["scale_factor",1],PARAMETER["false_easting",74996.927],PARAMETER["false_northing",133508.35],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","9741"]]

Read the full GeoServer guide →

How do I add EPSG:9741 to PostGIS?

Add the following definition to your PostGIS configuration:

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (9741, 'EPSG', 9741, '+proj=tmerc +lat_0=56.35 +lon_0=-2.75 +k=1 +x_0=74996.927 +y_0=133508.35 +ellps=GRS80 +units=m +no_defs +type=crs', 'PROJCS["EOS21 Grid",GEOGCS["EOS21-IRF",DATUM["EOS21_Intermediate_Reference_Frame",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","1308"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","9739"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",56.35],PARAMETER["central_meridian",-2.75],PARAMETER["scale_factor",1],PARAMETER["false_easting",74996.927],PARAMETER["false_northing",133508.35],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","9741"]]');

Read the full PostGIS guide →

How do I add EPSG:9741 to MapServer?

Add the following definition to your MapServer configuration:

PROJECTION
  "+proj=tmerc"
  "+lat_0=56.35"
  "+lon_0=-2.75"
  "+k=1"
  "+x_0=74996.927"
  "+y_0=133508.35"
  "+ellps=GRS80"
  "+units=m"
  "+no_defs"
  "+type=crs"
END

Read the full MapServer guide →

How do I use EPSG:9741 with Proj4js?

Add the following definition to your Proj4js configuration:

proj4.defs("EPSG:9741", "+proj=tmerc +lat_0=56.35 +lon_0=-2.75 +k=1 +x_0=74996.927 +y_0=133508.35 +ellps=GRS80 +units=m +no_defs +type=crs");

Read the full Proj4js guide →

Type

Projected

Unit

metre

Geodetic CRS

EOS21-IRF

Datum

EOS21 Intermediate Reference Frame

Ellipsoid

GRS 1980

Prime Meridian

Greenwich

Area of Use

UK - Tweedmouth to Aberdeen

United Kingdom (UK) - on or related to the complex of rail routes in the East of Scotland, incorpora…

Coordinate System

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

Center Coordinates

74996.93 136848.80

Projected Bounds

229565.31 23873.75123944.12 44733.62

WGS84 Bounds

57.21 -3.56-1.94 55.55

Data Source

EPSG

Information Source

Network Rail.

Revision Date

2026-02-10

Scope

Engineering survey and topographic mapping for railway applications.

Remarks

The CRS's definition through transformation ETRS89-GBR [OSNet v2009] to EOS21-IRF (1) (code 9740) and map projection EOS21-TM (code 9738) emulates the EOS21 Snake projection applied to ETRS89 as realized through OSNet v2009.

EPSG

9741