EPSG:11390

OSGB36 / Heathrow Airport GIS Grid 2026

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Available transformations
to EPSG:4326
EPSG:4326 - WGS 84

Selected transformation

Name: OSGB36 to WGS 84 (9)

Method: NTv2

Grid Files: OSTN15_NTv2_OSGBtoETRS.gsb

Remarks: Parameter values taken from OSGB36 to ETRS89 (2) (tfm code 7709) assuming that ETRS89 is coincident with WGS 84 within the accuracy of the tfm. Replaces OSGB36 to WGS 84 (7) (tfm code 5339).

Information source: EPSG

Revision date: 2021-08-19

Attributes

Unit: metre

Geodetic CRS: OSGB36

Datum: Ordnance Survey of Great Britain 1936

Ellipsoid: Airy 1830

Prime meridian: Greenwich

Data source: EPSG

Information source: Ordnance Survey of Great Britain on behalf of ESRI (UK).

Revision date: 2026-03-05

Scope: GIS.

Remarks: Heathrow Airport GIS Grid 2026 approximates Heathrow Airport Grid (HAG) (CRS code 11378) to an accuracy of better than 12mm within airport area and 89 mm across full area of use (2D RMS 0.007 and 0.039 m respectively derived through comparison of coordinates at 100m spacing throughout the airport area). Created for use in GIS applications that do not support the true HAG definition through engineering CRS (code 11378) and similarity transformation to British National Grid (code 11388). Accuracy of approximation deteriorates beyond airport extent - do not use this CRS beyond that area.

Area of use: UK - Heathrow airport and surrounding area.

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

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Center coordinates
-183404.94 445426.84

Projected bounds:
-572161.43 -185809.87
147733.6 977320.71

WGS84 bounds:
-9.01 49.75
2.01 61.01

United Kingdom (UK) - offshore to boundary of UKCS within 49°45'N to 61°N and 9°W to 2°E; onshore Great Britain (England, Wales and Scotland). Isle of Man onshore.
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Definition: OGC Well Known Text

PROJCS["OSGB36 / Heathrow Airport GIS Grid 2026",
    GEOGCS["OSGB36",
        DATUM["Ordnance_Survey_of_Great_Britain_1936",
            SPHEROID["Airy 1830",6377563.396,299.3249646],
            EXTENSION["PROJ4_GRIDS","uk_os_OSTN15_NTv2_OSGBtoETRS.tif"]],
        PRIMEM["Greenwich",0,
            AUTHORITY["EPSG","8901"]],
        UNIT["degree",0.0174532925199433,
            AUTHORITY["EPSG","9122"]],
        AUTHORITY["EPSG","4277"]],
    PROJECTION["Local Orthographic"],
    PARAMETER["latitude_of_center",51.4701102238889],
    PARAMETER["longitude_of_center",-0.451656585555556],
    PARAMETER["azimuth",359.700932272222],
    PARAMETER["scale_factor",1.000002816],
    PARAMETER["false_easting",7334.818],
    PARAMETER["false_northing",5637.421],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AXIS["Easting",EAST],
    AXIS["Northing",NORTH],
    AUTHORITY["EPSG","11390"]]

Definition: OGC Well Known Text 2 (2019)

PROJCRS["OSGB36 / Heathrow Airport GIS Grid 2026",
    BASEGEOGCRS["OSGB36",
        DATUM["Ordnance Survey of Great Britain 1936",
            ELLIPSOID["Airy 1830",6377563.396,299.3249646,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,
            ANGLEUNIT["degree",0.0174532925199433]],
        ID["EPSG",4277]],
    CONVERSION["Heathrow Airport GIS Grid 2026",
        METHOD["Local Orthographic",
            ID["EPSG",1130]],
        PARAMETER["Latitude of projection centre",51.4701102238889,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8811]],
        PARAMETER["Longitude of projection centre",-0.451656585555556,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8812]],
        PARAMETER["Azimuth at projection centre",359.700932272222,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8813]],
        PARAMETER["Scale factor at projection centre",1.000002816,
            SCALEUNIT["unity",1],
            ID["EPSG",8815]],
        PARAMETER["Easting at projection centre",7334.818,
            LENGTHUNIT["metre",1],
            ID["EPSG",8816]],
        PARAMETER["Northing at projection centre",5637.421,
            LENGTHUNIT["metre",1],
            ID["EPSG",8817]]],
    CS[Cartesian,2],
        AXIS["(E)",east,
            ORDER[1],
            LENGTHUNIT["metre",1]],
        AXIS["(N)",north,
            ORDER[2],
            LENGTHUNIT["metre",1]],
    USAGE[
        SCOPE["GIS."],
        AREA["UK - Heathrow airport and surrounding area."],
        BBOX[51.42,-0.56,51.52,-0.37]],
    ID["EPSG",11390]]

Definition: ESRI Well Known Text

PROJCS["OSGB36_Heathrow_Airport_GIS_Grid_2026",
    GEOGCS["GCS_OSGB_1936",
        DATUM["D_OSGB_1936",
            SPHEROID["Airy_1830",6377563.396,299.3249646],
            EXTENSION["PROJ4_GRIDS","uk_os_OSTN15_NTv2_OSGBtoETRS.tif"]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Local"],
    PARAMETER["False_Easting",7334.818],
    PARAMETER["False_Northing",5637.421],
    PARAMETER["Scale_Factor",1.000002816],
    PARAMETER["Azimuth",-0.299067727777981],
    PARAMETER["Longitude_Of_Center",-0.451656585555556],
    PARAMETER["Latitude_Of_Center",51.4701102238889],
    UNIT["Meter",1.0]]

Definition: PROJ.4

+proj=ortho +lat_0=51.4701102238889 +lon_0=-0.451656585555556 +alpha=359.700932272222 +k=1.000002816 +x_0=7334.818 +y_0=5637.421 +ellps=airy +nadgrids=uk_os_OSTN15_NTv2_OSGBtoETRS.tif +units=m +no_defs +type=crs

Definition: JavaScript (Proj4js) 

proj4.defs("EPSG:11390","+proj=ortho +lat_0=51.4701102238889 +lon_0=-0.451656585555556 +alpha=359.700932272222 +k=1.000002816 +x_0=7334.818 +y_0=5637.421 +ellps=airy +nadgrids=uk_os_OSTN15_NTv2_OSGBtoETRS.tif +units=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "ProjectedCRS",
    "name": "OSGB36 / Heathrow Airport GIS Grid 2026",
    "base_crs": {
        "type": "GeographicCRS",
        "name": "OSGB36",
        "datum": {
            "type": "GeodeticReferenceFrame",
            "name": "Ordnance Survey of Great Britain 1936",
            "ellipsoid": {
                "name": "Airy 1830",
                "semi_major_axis": 6377563.396,
                "inverse_flattening": 299.3249646
            }
        },
        "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": 4277
        }
    },
    "conversion": {
        "name": "Heathrow Airport GIS Grid 2026",
        "method": {
            "name": "Local Orthographic",
            "id": {
                "authority": "EPSG",
                "code": 1130
            }
        },
        "parameters": [
            {
                "name": "Latitude of projection centre",
                "value": 51.4701102238889,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8811
                }
            },
            {
                "name": "Longitude of projection centre",
                "value": -0.451656585555556,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8812
                }
            },
            {
                "name": "Azimuth at projection centre",
                "value": 359.700932272222,
                "unit": "degree",
                "id": {
                    "authority": "EPSG",
                    "code": 8813
                }
            },
            {
                "name": "Scale factor at projection centre",
                "value": 1.000002816,
                "unit": "unity",
                "id": {
                    "authority": "EPSG",
                    "code": 8815
                }
            },
            {
                "name": "Easting at projection centre",
                "value": 7334.818,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8816
                }
            },
            {
                "name": "Northing at projection centre",
                "value": 5637.421,
                "unit": "metre",
                "id": {
                    "authority": "EPSG",
                    "code": 8817
                }
            }
        ]
    },
    "coordinate_system": {
        "subtype": "Cartesian",
        "axis": [
            {
                "name": "Easting",
                "abbreviation": "E",
                "direction": "east",
                "unit": "metre"
            },
            {
                "name": "Northing",
                "abbreviation": "N",
                "direction": "north",
                "unit": "metre"
            }
        ]
    },
    "scope": "GIS.",
    "area": "UK - Heathrow airport and surrounding area.",
    "bbox": {
        "south_latitude": 51.42,
        "west_longitude": -0.56,
        "north_latitude": 51.52,
        "east_longitude": -0.37
    },
    "id": {
        "authority": "EPSG",
        "code": 11390
    }
}

Definition: GeoServer

11390=PROJCS["OSGB36 / Heathrow Airport GIS Grid 2026",GEOGCS["OSGB36",DATUM["Ordnance_Survey_of_Great_Britain_1936",SPHEROID["Airy 1830",6377563.396,299.3249646],EXTENSION["PROJ4_GRIDS","uk_os_OSTN15_NTv2_OSGBtoETRS.tif"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4277"]],PROJECTION["Local Orthographic"],PARAMETER["latitude_of_center",51.4701102238889],PARAMETER["longitude_of_center",-0.451656585555556],PARAMETER["azimuth",359.700932272222],PARAMETER["scale_factor",1.000002816],PARAMETER["false_easting",7334.818],PARAMETER["false_northing",5637.421],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","11390"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=ortho"
	"lat_0=51.4701102238889"
	"lon_0=-0.451656585555556"
	"alpha=359.700932272222"
	"k=1.000002816"
	"x_0=7334.818"
	"y_0=5637.421"
	"ellps=airy"
	"nadgrids=uk_os_OSTN15_NTv2_OSGBtoETRS.tif"
	"units=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=ortho +lat_0=51.4701102238889 +lon_0=-0.451656585555556 +alpha=359.700932272222 +k=1.000002816 +x_0=7334.818 +y_0=5637.421 +ellps=airy +nadgrids=uk_os_OSTN15_NTv2_OSGBtoETRS.tif +units=m +no_defs +type=crs">
	<Layer srs="+proj=ortho +lat_0=51.4701102238889 +lon_0=-0.451656585555556 +alpha=359.700932272222 +k=1.000002816 +x_0=7334.818 +y_0=5637.421 +ellps=airy +nadgrids=uk_os_OSTN15_NTv2_OSGBtoETRS.tif +units=m +no_defs +type=crs">
	</Layer>
</Map>

Definition: SQL (PostGIS)

INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext) values ( 11390, 'EPSG', 11390, '+proj=ortho +lat_0=51.4701102238889 +lon_0=-0.451656585555556 +alpha=359.700932272222 +k=1.000002816 +x_0=7334.818 +y_0=5637.421 +ellps=airy +nadgrids=uk_os_OSTN15_NTv2_OSGBtoETRS.tif +units=m +no_defs +type=crs', 'PROJCS["OSGB36 / Heathrow Airport GIS Grid 2026",GEOGCS["OSGB36",DATUM["Ordnance_Survey_of_Great_Britain_1936",SPHEROID["Airy 1830",6377563.396,299.3249646],EXTENSION["PROJ4_GRIDS","uk_os_OSTN15_NTv2_OSGBtoETRS.tif"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4277"]],PROJECTION["Local Orthographic"],PARAMETER["latitude_of_center",51.4701102238889],PARAMETER["longitude_of_center",-0.451656585555556],PARAMETER["azimuth",359.700932272222],PARAMETER["scale_factor",1.000002816],PARAMETER["false_easting",7334.818],PARAMETER["false_northing",5637.421],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","11390"]]');