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Geodetic CRS: SZCTW Grid + ODN height
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.
Area of use: United Kingdom (UK) - Sizewell power station site and rail and road routes related to the site.
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Center coordinates
75487.56 49826.39
Projected bounds:
63498.97 35917.24
87466.57 63754.1
WGS84 bounds:
1.35 52.13
1.7 52.38
Definition: OGC Well Known Text
COMPD_CS["SZCTW Grid + ODN height", PROJCS["SZCTW Grid", 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"]], PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",52.25], PARAMETER["central_meridian",1.55], PARAMETER["scale_factor",1], PARAMETER["false_easting",77194.7386], PARAMETER["false_northing",49269.7375], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AXIS["Easting",EAST], AXIS["Northing",NORTH], AUTHORITY["EPSG","11469"]], VERT_CS["ODN height", VERT_DATUM["Ordnance Datum Newlyn",2005, AUTHORITY["EPSG","5101"]], UNIT["metre",1, AUTHORITY["EPSG","9001"]], AXIS["Gravity-related height",UP], AUTHORITY["EPSG","5701"]], AUTHORITY["EPSG","11470"]]
Definition: OGC Well Known Text 2 (2019)
COMPOUNDCRS["SZCTW Grid + ODN height", PROJCRS["SZCTW Grid", BASEGEOGCRS["SZCTW-IRF", DATUM["SZCTW Intermediate Reference Frame", ELLIPSOID["GRS 1980",6378137,298.257222101, LENGTHUNIT["metre",1]]], PRIMEM["Greenwich",0, ANGLEUNIT["degree",0.0174532925199433]], ID["EPSG",11466]], CONVERSION["SZCTW-TM", METHOD["Transverse Mercator", ID["EPSG",9807]], PARAMETER["Latitude of natural origin",52.25, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8801]], PARAMETER["Longitude of natural origin",1.55, ANGLEUNIT["degree",0.0174532925199433], ID["EPSG",8802]], PARAMETER["Scale factor at natural origin",1, SCALEUNIT["unity",1], ID["EPSG",8805]], PARAMETER["False easting",77194.7386, LENGTHUNIT["metre",1], ID["EPSG",8806]], PARAMETER["False northing",49269.7375, LENGTHUNIT["metre",1], ID["EPSG",8807]]], CS[Cartesian,2], AXIS["(E)",east, ORDER[1], LENGTHUNIT["metre",1]], AXIS["(N)",north, ORDER[2], LENGTHUNIT["metre",1]]], VERTCRS["ODN height", VDATUM["Ordnance Datum Newlyn"], CS[vertical,1], AXIS["gravity-related height (H)",up, LENGTHUNIT["metre",1]]], 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",11470]]
Definition: ESRI Well Known Text
PROJCS["SZCTW_Grid", 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]], PROJECTION["Transverse_Mercator"], PARAMETER["False_Easting",77194.7386], PARAMETER["False_Northing",49269.7375], PARAMETER["Central_Meridian",1.55], PARAMETER["Scale_Factor",1.0], PARAMETER["Latitude_Of_Origin",52.25], UNIT["Meter",1.0]], VERTCS["Newlyn", VDATUM["Ordnance_Datum_Newlyn"], PARAMETER["Vertical_Shift",0.0], PARAMETER["Direction",1.0], UNIT["Meter",1.0]]
Definition: JSON
{ "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json", "type": "CompoundCRS", "name": "SZCTW Grid + ODN height", "components": [ { "type": "ProjectedCRS", "name": "SZCTW Grid", "base_crs": { "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" } ] }, "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)." }, "conversion": { "name": "SZCTW-TM", "method": { "name": "Transverse Mercator", "id": { "authority": "EPSG", "code": 9807 } }, "parameters": [ { "name": "Latitude of natural origin", "value": 52.25, "unit": "degree", "id": { "authority": "EPSG", "code": 8801 } }, { "name": "Longitude of natural origin", "value": 1.55, "unit": "degree", "id": { "authority": "EPSG", "code": 8802 } }, { "name": "Scale factor at natural origin", "value": 1, "unit": "unity", "id": { "authority": "EPSG", "code": 8805 } }, { "name": "False easting", "value": 77194.7386, "unit": "metre", "id": { "authority": "EPSG", "code": 8806 } }, { "name": "False northing", "value": 49269.7375, "unit": "metre", "id": { "authority": "EPSG", "code": 8807 } } ] }, "coordinate_system": { "subtype": "Cartesian", "axis": [ { "name": "Easting", "abbreviation": "E", "direction": "east", "unit": "metre" }, { "name": "Northing", "abbreviation": "N", "direction": "north", "unit": "metre" } ] } }, { "type": "VerticalCRS", "name": "ODN height", "datum": { "type": "VerticalReferenceFrame", "name": "Ordnance Datum Newlyn" }, "coordinate_system": { "subtype": "vertical", "axis": [ { "name": "Gravity-related height", "abbreviation": "H", "direction": "up", "unit": "metre" } ] } } ], "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": 11470 } }
Definition: GeoServer
11470=COMPD_CS["SZCTW Grid + ODN height",PROJCS["SZCTW Grid",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"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",52.25],PARAMETER["central_meridian",1.55],PARAMETER["scale_factor",1],PARAMETER["false_easting",77194.7386],PARAMETER["false_northing",49269.7375],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","11469"]],VERT_CS["ODN height",VERT_DATUM["Ordnance Datum Newlyn",2005,AUTHORITY["EPSG","5101"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","5701"]],AUTHORITY["EPSG","11470"]]
Definition: Mapnik
<?xml version="1.0" encoding="utf-8"?> <Map srs="+proj=tmerc +lat_0=52.25 +lon_0=1.55 +k=1 +x_0=77194.7386 +y_0=49269.7375 +ellps=GRS80 +units=m +vunits=m +no_defs +type=crs"> <Layer srs="+proj=tmerc +lat_0=52.25 +lon_0=1.55 +k=1 +x_0=77194.7386 +y_0=49269.7375 +ellps=GRS80 +units=m +vunits=m +no_defs +type=crs"> </Layer> </Map>
Definition: SQL (PostGIS)
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 11470, 'EPSG', 11470, '+proj=tmerc +lat_0=52.25 +lon_0=1.55 +k=1 +x_0=77194.7386 +y_0=49269.7375 +ellps=GRS80 +units=m +vunits=m +no_defs +type=crs', 'COMPD_CS["SZCTW Grid + ODN height",PROJCS["SZCTW Grid",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"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",52.25],PARAMETER["central_meridian",1.55],PARAMETER["scale_factor",1],PARAMETER["false_easting",77194.7386],PARAMETER["false_northing",49269.7375],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","11469"]],VERT_CS["ODN height",VERT_DATUM["Ordnance Datum Newlyn",2005,AUTHORITY["EPSG","5101"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","5701"]],AUTHORITY["EPSG","11470"]]');
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