EPSG:11006

London Survey Grid 2025

Attributes

Geodetic CRS: London Survey Grid 2025

Data source: EPSG

Information source: Transport for London, Topographic surveys and mapping Standard S1026, issue A4, May 2025.

Revision date: 2025-10-28

Scope: Engineering survey and topographic mapping for transport applications.

Remarks: Replaces the London Survey Grid (LSG), which was formerly also known as the LU Grid, the LUL Grid or the Crossrail Grid. The LSG2025 is a re-baselined definition of LSG which recognises the CORS network revision from OSNet v2001 to OSNet v2009 made in 2016 but maintains the original map projection and transformation parameter values. Due to the differences in coordinate values derived from the original Xrail84 control network, through OSNet v2001 or through OSNet v2009, horizontal positions of old data may differ from LSG2025 by up to 12mm in Eastings and 2mm in Northings. Vertically, LSG2025 maintains LSG heights (derived by applying the OSGM02 geoid model to OSNet v2001 ellipsoidal coordinates) through use of the LGGM2025 geoid model applied to ETRS89-GBR [OSNet v2009].

Area of use: United Kingdom (UK) - Greater London and surrounding area.

Covered area powered by MapTiler MapTiler logo
SimpleMap

Center coordinates
70826.42 39884.88

Projected bounds:
-3845.59 -10185.49
145353.46 90596.74

WGS84 bounds:
-1.33 51.1
0.8 52.0

United Kingdom (UK) - Greater London and surrounding area.
MapTiler banner

Definition: OGC Well Known Text

COMPD_CS["London Survey Grid 2025",
    PROJCS["Xrail84 / London Survey Grid TM",
        GEOGCS["Xrail84",
            DATUM["Xrail84",
                SPHEROID["WGS 84",6378137,298.257223563,
                    AUTHORITY["EPSG","7030"]],
                AUTHORITY["EPSG","1408"]],
            PRIMEM["Greenwich",0,
                AUTHORITY["EPSG","8901"]],
            UNIT["degree",0.0174532925199433,
                AUTHORITY["EPSG","9122"]],
            AUTHORITY["EPSG","10993"]],
        PROJECTION["Transverse_Mercator"],
        PARAMETER["latitude_of_origin",51.1666666666667],
        PARAMETER["central_meridian",-0.158333333333333],
        PARAMETER["scale_factor",0.9999999],
        PARAMETER["false_easting",78250],
        PARAMETER["false_northing",-2800],
        UNIT["metre",1,
            AUTHORITY["EPSG","9001"]],
        AXIS["Easting",EAST],
        AXIS["Northing",NORTH],
        AUTHORITY["EPSG","10995"]],
    VERT_CS["London Survey Grid height",
        VERT_DATUM["London Survey Grid height datum",2005,
            AUTHORITY["EPSG","1423"]],
        UNIT["metre",1,
            AUTHORITY["EPSG","9001"]],
        AXIS["Gravity-related height",UP],
        AUTHORITY["EPSG","10989"]],
    AUTHORITY["EPSG","11006"]]

Definition: OGC Well Known Text 2 (2019)

COMPOUNDCRS["London Survey Grid 2025",
    PROJCRS["Xrail84 / London Survey Grid TM",
        BASEGEOGCRS["Xrail84",
            DATUM["Xrail84",
                ELLIPSOID["WGS 84",6378137,298.257223563,
                    LENGTHUNIT["metre",1]]],
            PRIMEM["Greenwich",0,
                ANGLEUNIT["degree",0.0174532925199433]],
            ID["EPSG",10993]],
        CONVERSION["London Survey Grid TM",
            METHOD["Transverse Mercator",
                ID["EPSG",9807]],
            PARAMETER["Latitude of natural origin",51.1666666666667,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8801]],
            PARAMETER["Longitude of natural origin",-0.158333333333333,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8802]],
            PARAMETER["Scale factor at natural origin",0.9999999,
                SCALEUNIT["unity",1],
                ID["EPSG",8805]],
            PARAMETER["False easting",78250,
                LENGTHUNIT["metre",1],
                ID["EPSG",8806]],
            PARAMETER["False northing",-2800,
                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["London Survey Grid height",
        VDATUM["London Survey Grid height datum"],
        CS[vertical,1],
            AXIS["gravity-related height (H)",up,
                LENGTHUNIT["metre",1]]],
    USAGE[
        SCOPE["Engineering survey and topographic mapping for transport applications."],
        AREA["United Kingdom (UK) - Greater London and surrounding area."],
        BBOX[51.1,-1.33,52,0.8]],
    ID["EPSG",11006]]

Definition: ESRI Well Known Text

PROJCS["Xrail84_London_Survey_Grid_TM",
    GEOGCS["GCS_Xrail84",
        DATUM["D_Xrail84",
            SPHEROID["WGS_1984",6378137.0,298.257223563]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["False_Easting",78250.0],
    PARAMETER["False_Northing",-2800.0],
    PARAMETER["Central_Meridian",-0.158333333333333],
    PARAMETER["Scale_Factor",0.9999999],
    PARAMETER["Latitude_Of_Origin",51.1666666666667],
    UNIT["Meter",1.0]],
VERTCS["London_Survey_Grid_height",
    VDATUM["London_Survey_Grid_height_datum"],
    PARAMETER["Vertical_Shift",0.0],
    PARAMETER["Direction",1.0],
    UNIT["Meter",1.0]]

Definition: PROJ.4

+proj=tmerc +lat_0=51.1666666666667 +lon_0=-0.158333333333333 +k=0.9999999 +x_0=78250 +y_0=-2800 +ellps=WGS84 +units=m +vunits=m +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:11006","+proj=tmerc +lat_0=51.1666666666667 +lon_0=-0.158333333333333 +k=0.9999999 +x_0=78250 +y_0=-2800 +ellps=WGS84 +units=m +vunits=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "CompoundCRS",
    "name": "London Survey Grid 2025",
    "components": [
        {
            "type": "ProjectedCRS",
            "name": "Xrail84 / London Survey Grid TM",
            "base_crs": {
                "type": "GeographicCRS",
                "name": "Xrail84",
                "datum": {
                    "type": "GeodeticReferenceFrame",
                    "name": "Xrail84",
                    "ellipsoid": {
                        "name": "WGS 84",
                        "semi_major_axis": 6378137,
                        "inverse_flattening": 298.257223563
                    }
                },
                "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": 10993
                }
            },
            "conversion": {
                "name": "London Survey Grid TM",
                "method": {
                    "name": "Transverse Mercator",
                    "id": {
                        "authority": "EPSG",
                        "code": 9807
                    }
                },
                "parameters": [
                    {
                        "name": "Latitude of natural origin",
                        "value": 51.1666666666667,
                        "unit": "degree",
                        "id": {
                            "authority": "EPSG",
                            "code": 8801
                        }
                    },
                    {
                        "name": "Longitude of natural origin",
                        "value": -0.158333333333333,
                        "unit": "degree",
                        "id": {
                            "authority": "EPSG",
                            "code": 8802
                        }
                    },
                    {
                        "name": "Scale factor at natural origin",
                        "value": 0.9999999,
                        "unit": "unity",
                        "id": {
                            "authority": "EPSG",
                            "code": 8805
                        }
                    },
                    {
                        "name": "False easting",
                        "value": 78250,
                        "unit": "metre",
                        "id": {
                            "authority": "EPSG",
                            "code": 8806
                        }
                    },
                    {
                        "name": "False northing",
                        "value": -2800,
                        "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": "London Survey Grid height",
            "datum": {
                "type": "VerticalReferenceFrame",
                "name": "London Survey Grid height datum"
            },
            "coordinate_system": {
                "subtype": "vertical",
                "axis": [
                    {
                        "name": "Gravity-related height",
                        "abbreviation": "H",
                        "direction": "up",
                        "unit": "metre"
                    }
                ]
            }
        }
    ],
    "scope": "Engineering survey and topographic mapping for transport applications.",
    "area": "United Kingdom (UK) - Greater London and surrounding area.",
    "bbox": {
        "south_latitude": 51.1,
        "west_longitude": -1.33,
        "north_latitude": 52,
        "east_longitude": 0.8
    },
    "id": {
        "authority": "EPSG",
        "code": 11006
    }
}

Definition: GeoServer

11006=COMPD_CS["London Survey Grid 2025",PROJCS["Xrail84 / London Survey Grid TM",GEOGCS["Xrail84",DATUM["Xrail84",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","1408"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","10993"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",51.1666666666667],PARAMETER["central_meridian",-0.158333333333333],PARAMETER["scale_factor",0.9999999],PARAMETER["false_easting",78250],PARAMETER["false_northing",-2800],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","10995"]],VERT_CS["London Survey Grid height",VERT_DATUM["London Survey Grid height datum",2005,AUTHORITY["EPSG","1423"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","10989"]],AUTHORITY["EPSG","11006"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=tmerc"
	"lat_0=51.1666666666667"
	"lon_0=-0.158333333333333"
	"k=0.9999999"
	"x_0=78250"
	"y_0=-2800"
	"ellps=WGS84"
	"units=m"
	"vunits=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=tmerc +lat_0=51.1666666666667 +lon_0=-0.158333333333333 +k=0.9999999 +x_0=78250 +y_0=-2800 +ellps=WGS84 +units=m +vunits=m +no_defs +type=crs">
	<Layer srs="+proj=tmerc +lat_0=51.1666666666667 +lon_0=-0.158333333333333 +k=0.9999999 +x_0=78250 +y_0=-2800 +ellps=WGS84 +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 ( 11006, 'EPSG', 11006, '+proj=tmerc +lat_0=51.1666666666667 +lon_0=-0.158333333333333 +k=0.9999999 +x_0=78250 +y_0=-2800 +ellps=WGS84 +units=m +vunits=m +no_defs +type=crs', 'COMPD_CS["London Survey Grid 2025",PROJCS["Xrail84 / London Survey Grid TM",GEOGCS["Xrail84",DATUM["Xrail84",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","1408"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","10993"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",51.1666666666667],PARAMETER["central_meridian",-0.158333333333333],PARAMETER["scale_factor",0.9999999],PARAMETER["false_easting",78250],PARAMETER["false_northing",-2800],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","10995"]],VERT_CS["London Survey Grid height",VERT_DATUM["London Survey Grid height datum",2005,AUTHORITY["EPSG","1423"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","10989"]],AUTHORITY["EPSG","11006"]]');