EPSG:11466

SZCTW-IRF

Attributes

Unit: degree (supplier to define representation)

Geodetic CRS: SZCTW-IRF

Datum: SZCTW Intermediate Reference Frame

Ellipsoid: GRS 1980

Prime meridian: Greenwich

Data source: EPSG

Information source: Severn Partnership on behalf of Civil Works Alliance / AtkinsRealis.

Revision date: 2026-05-19

Scope: Engineering survey, GIS, topographic mapping.

Remarks: Intermediate CRS created in 2026 to assist the emulation of the ETRS89 / SZCTW SnakeGrid projected CRS through transformation ETRS89-GBR [OSNet v2009] to SZCTW-IRF (1) (code 11467) used in conjunction with the SZCTW-TM map projection (code 11468).

Area of use: United Kingdom (UK) - Sizewell power station site and rail and road routes related to the site.

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

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SimpleMap

Center coordinates
1.52 52.26

WGS84 bounds:
1.35 52.13
1.7 52.38

United Kingdom (UK) - Sizewell power station site and rail and road routes related to the site.
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Definition: OGC Well Known Text

GEOGCS["SZCTW-IRF",
    DATUM["SZCTW_Intermediate_Reference_Frame",
        SPHEROID["GRS 1980",6378137,298.257222101,
            AUTHORITY["EPSG","7019"]],
        AUTHORITY["EPSG","1461"]],
    PRIMEM["Greenwich",0,
        AUTHORITY["EPSG","8901"]],
    UNIT["degree",0.0174532925199433,
        AUTHORITY["EPSG","9122"]],
    AUTHORITY["EPSG","11466"]]

Definition: OGC Well Known Text 2 (2019)

GEOGCRS["SZCTW-IRF",
    DATUM["SZCTW Intermediate Reference Frame",
        ELLIPSOID["GRS 1980",6378137,298.257222101,
            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["Engineering survey, GIS, topographic mapping."],
        AREA["United Kingdom (UK) - Sizewell power station site and  rail and road routes related to the site."],
        BBOX[52.13,1.35,52.38,1.7]],
    ID["EPSG",11466],
    REMARK["Intermediate CRS created in 2026 to assist the emulation of the ETRS89 / SZCTW SnakeGrid projected CRS through transformation ETRS89-GBR [OSNet v2009] to SZCTW-IRF (1) (code 11467) used in conjunction with the SZCTW-TM map projection (code 11468)."]]

Definition: ESRI Well Known Text

GEOGCS["GCS_SZCTW-IRF",
    DATUM["D_SZCTW_Intermediate_Reference_Frame",
        SPHEROID["GRS_1980",6378137.0,298.257222101]],
    PRIMEM["Greenwich",0.0],
    UNIT["Degree",0.0174532925199433]]

Definition: PROJ.4

+proj=longlat +ellps=GRS80 +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:11466","+proj=longlat +ellps=GRS80 +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeographicCRS",
    "name": "SZCTW-IRF",
    "datum": {
        "type": "GeodeticReferenceFrame",
        "name": "SZCTW Intermediate Reference Frame",
        "ellipsoid": {
            "name": "GRS 1980",
            "semi_major_axis": 6378137,
            "inverse_flattening": 298.257222101
        }
    },
    "coordinate_system": {
        "subtype": "ellipsoidal",
        "axis": [
            {
                "name": "Geodetic latitude",
                "abbreviation": "Lat",
                "direction": "north",
                "unit": "degree"
            },
            {
                "name": "Geodetic longitude",
                "abbreviation": "Lon",
                "direction": "east",
                "unit": "degree"
            }
        ]
    },
    "scope": "Engineering survey, GIS, topographic mapping.",
    "area": "United Kingdom (UK) - Sizewell power station site and  rail and road routes related to the site.",
    "bbox": {
        "south_latitude": 52.13,
        "west_longitude": 1.35,
        "north_latitude": 52.38,
        "east_longitude": 1.7
    },
    "id": {
        "authority": "EPSG",
        "code": 11466
    },
    "remarks": "Intermediate CRS created in 2026 to assist the emulation of the ETRS89 / SZCTW SnakeGrid projected CRS through transformation ETRS89-GBR [OSNet v2009] to SZCTW-IRF (1) (code 11467) used in conjunction with the SZCTW-TM map projection (code 11468)."
}

Definition: GeoServer

11466=GEOGCS["SZCTW-IRF",DATUM["SZCTW_Intermediate_Reference_Frame",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","1461"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","11466"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=longlat"
	"ellps=GRS80"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=longlat +ellps=GRS80 +no_defs +type=crs">
	<Layer srs="+proj=longlat +ellps=GRS80 +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 11466, 'EPSG', 11466, '+proj=longlat +ellps=GRS80 +no_defs +type=crs', 'GEOGCS["SZCTW-IRF",DATUM["SZCTW_Intermediate_Reference_Frame",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","1461"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","11466"]]');