EPSG:1461

SZCTW Intermediate Reference Frame

Attributes

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: Created in 2026 to support intermediate CRS "SZCTW-IRF" in the emulation of the SZCTW Snake map projection.

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

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WGS84 bounds:
1.7 52.13
1.35 52.38

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Definition: OGC Well Known Text

DATUM["SZCTW_Intermediate_Reference_Frame",
    SPHEROID["GRS 1980",6378137,298.257222101,
        AUTHORITY["EPSG","7019"]],
    AUTHORITY["EPSG","1461"]]

Definition: OGC Well Known Text 2 (2019)

DATUM["SZCTW Intermediate Reference Frame",
    ELLIPSOID["GRS 1980",6378137,298.257222101,
        LENGTHUNIT["metre",1]],
    ID["EPSG",1461]]

Definition: ESRI Well Known Text

DATUM["D_SZCTW_Intermediate_Reference_Frame",
    SPHEROID["GRS_1980",6378137.0,298.257222101]]

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "GeodeticReferenceFrame",
    "name": "SZCTW Intermediate Reference Frame",
    "ellipsoid": {
        "name": "GRS 1980",
        "semi_major_axis": 6378137,
        "inverse_flattening": 298.257222101
    },
    "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": 1461
    }
}

Definition: GeoServer

1461-datum=DATUM["SZCTW_Intermediate_Reference_Frame",SPHEROID["GRS 1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],AUTHORITY["EPSG","1461"]]