EPSG:9920

OSGB36 / British National Grid + BI height

Attributes

Geodetic CRS: OSGB36 / British National Grid + BI height

Data source: EPSG

Information source: Ordnance Survey of Great Britain.

Revision date: 2022-01-24

Scope: Spatial referencing.

Remarks: BI height is based on an ensemble including ODN, ODN (Offshore) and island vertical datums.

Area of use: 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.

Center coordinates
305055.15 610582.2

Projected bounds:
-104728.76 -16703.89
688806.01 1256616.32

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

COMPD_CS["OSGB36 / British National Grid + BI height",
    PROJCS["OSGB36 / British National Grid",
        GEOGCS["OSGB36",
            DATUM["Ordnance_Survey_of_Great_Britain_1936",
                SPHEROID["Airy 1830",6377563.396,299.3249646,
                    AUTHORITY["EPSG","7001"]],
                AUTHORITY["EPSG","6277"]],
            PRIMEM["Greenwich",0,
                AUTHORITY["EPSG","8901"]],
            UNIT["degree",0.0174532925199433,
                AUTHORITY["EPSG","9122"]],
            AUTHORITY["EPSG","4277"]],
        PROJECTION["Transverse_Mercator"],
        PARAMETER["latitude_of_origin",49],
        PARAMETER["central_meridian",-2],
        PARAMETER["scale_factor",0.9996012717],
        PARAMETER["false_easting",400000],
        PARAMETER["false_northing",-100000],
        UNIT["metre",1,
            AUTHORITY["EPSG","9001"]],
        AXIS["Easting",EAST],
        AXIS["Northing",NORTH],
        AUTHORITY["EPSG","27700"]],
    VERT_CS["BI height",
        VERT_DATUM["British Isles height ensemble",2005,
            AUTHORITY["EPSG","1288"]],
        UNIT["metre",1,
            AUTHORITY["EPSG","9001"]],
        AXIS["Gravity-related height",UP],
        AUTHORITY["EPSG","9451"]],
    AUTHORITY["EPSG","9920"]]

Definition: OGC Well Known Text 2 (2019)

COMPOUNDCRS["OSGB36 / British National Grid + BI height",
    PROJCRS["OSGB36 / British National Grid",
        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["British National Grid",
            METHOD["Transverse Mercator",
                ID["EPSG",9807]],
            PARAMETER["Latitude of natural origin",49,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8801]],
            PARAMETER["Longitude of natural origin",-2,
                ANGLEUNIT["degree",0.0174532925199433],
                ID["EPSG",8802]],
            PARAMETER["Scale factor at natural origin",0.9996012717,
                SCALEUNIT["unity",1],
                ID["EPSG",8805]],
            PARAMETER["False easting",400000,
                LENGTHUNIT["metre",1],
                ID["EPSG",8806]],
            PARAMETER["False northing",-100000,
                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["BI height",
        ENSEMBLE["British Isles height ensemble",
            MEMBER["Malin Head"],
            MEMBER["Belfast Lough"],
            MEMBER["Ordnance Datum Newlyn"],
            MEMBER["Ordnance Datum Newlyn (Offshore)"],
            MEMBER["Ordnance Datum Newlyn (Orkney Isles)"],
            MEMBER["Lerwick"],
            MEMBER["Stornoway"],
            MEMBER["Douglas"],
            MEMBER["St. Marys"],
            ENSEMBLEACCURACY[0.4]],
        CS[vertical,1],
            AXIS["gravity-related height (H)",up,
                LENGTHUNIT["metre",1]]],
    USAGE[
        SCOPE["Spatial referencing."],
        AREA["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."],
        BBOX[49.75,-9.01,61.01,2.01]],
    ID["EPSG",9920]]

Definition: ESRI Well Known Text

PROJCS["British_National_Grid",
    GEOGCS["GCS_OSGB_1936",
        DATUM["D_OSGB_1936",
            SPHEROID["Airy_1830",6377563.396,299.3249646]],
        PRIMEM["Greenwich",0.0],
        UNIT["Degree",0.0174532925199433]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["False_Easting",400000.0],
    PARAMETER["False_Northing",-100000.0],
    PARAMETER["Central_Meridian",-2.0],
    PARAMETER["Scale_Factor",0.9996012717],
    PARAMETER["Latitude_Of_Origin",49.0],
    UNIT["Meter",1.0]],
VERTCS["BI_height",
    VDATUM["British_Isles_height_ensemble"],
    PARAMETER["Vertical_Shift",0.0],
    PARAMETER["Direction",1.0],
    UNIT["Meter",1.0]]

Definition: PROJ.4

+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +units=m +vunits=m +no_defs +type=crs

Definition: JavaScript (Proj4js)

proj4.defs("EPSG:9920","+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +units=m +vunits=m +no_defs +type=crs");

Definition: JSON

{
    "$schema": "https://proj.org/schemas/v0.7/projjson.schema.json",
    "type": "CompoundCRS",
    "name": "OSGB36 / British National Grid + BI height",
    "components": [
        {
            "type": "ProjectedCRS",
            "name": "OSGB36 / British National Grid",
            "base_crs": {
                "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": "British National Grid",
                "method": {
                    "name": "Transverse Mercator",
                    "id": {
                        "authority": "EPSG",
                        "code": 9807
                    }
                },
                "parameters": [
                    {
                        "name": "Latitude of natural origin",
                        "value": 49,
                        "unit": "degree",
                        "id": {
                            "authority": "EPSG",
                            "code": 8801
                        }
                    },
                    {
                        "name": "Longitude of natural origin",
                        "value": -2,
                        "unit": "degree",
                        "id": {
                            "authority": "EPSG",
                            "code": 8802
                        }
                    },
                    {
                        "name": "Scale factor at natural origin",
                        "value": 0.9996012717,
                        "unit": "unity",
                        "id": {
                            "authority": "EPSG",
                            "code": 8805
                        }
                    },
                    {
                        "name": "False easting",
                        "value": 400000,
                        "unit": "metre",
                        "id": {
                            "authority": "EPSG",
                            "code": 8806
                        }
                    },
                    {
                        "name": "False northing",
                        "value": -100000,
                        "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": "BI height",
            "datum_ensemble": {
                "name": "British Isles height ensemble",
                "members": [
                    {
                        "name": "Malin Head",
                        "id": {
                            "authority": "EPSG",
                            "code": 5130
                        }
                    },
                    {
                        "name": "Belfast Lough",
                        "id": {
                            "authority": "EPSG",
                            "code": 5131
                        }
                    },
                    {
                        "name": "Ordnance Datum Newlyn",
                        "id": {
                            "authority": "EPSG",
                            "code": 5101
                        }
                    },
                    {
                        "name": "Ordnance Datum Newlyn (Offshore)",
                        "id": {
                            "authority": "EPSG",
                            "code": 1164
                        }
                    },
                    {
                        "name": "Ordnance Datum Newlyn (Orkney Isles)",
                        "id": {
                            "authority": "EPSG",
                            "code": 5138
                        }
                    },
                    {
                        "name": "Lerwick",
                        "id": {
                            "authority": "EPSG",
                            "code": 5140
                        }
                    },
                    {
                        "name": "Stornoway",
                        "id": {
                            "authority": "EPSG",
                            "code": 5144
                        }
                    },
                    {
                        "name": "Douglas",
                        "id": {
                            "authority": "EPSG",
                            "code": 5148
                        }
                    },
                    {
                        "name": "St. Marys",
                        "id": {
                            "authority": "EPSG",
                            "code": 5147
                        }
                    }
                ],
                "accuracy": "0.4",
                "id": {
                    "authority": "EPSG",
                    "code": 1288
                }
            },
            "coordinate_system": {
                "subtype": "vertical",
                "axis": [
                    {
                        "name": "Gravity-related height",
                        "abbreviation": "H",
                        "direction": "up",
                        "unit": "metre"
                    }
                ]
            }
        }
    ],
    "scope": "Spatial referencing.",
    "area": "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.",
    "bbox": {
        "south_latitude": 49.75,
        "west_longitude": -9.01,
        "north_latitude": 61.01,
        "east_longitude": 2.01
    },
    "id": {
        "authority": "EPSG",
        "code": 9920
    }
}

Definition: GeoServer

9920=COMPD_CS["OSGB36 / British National Grid + BI height",PROJCS["OSGB36 / British National Grid",GEOGCS["OSGB36",DATUM["Ordnance_Survey_of_Great_Britain_1936",SPHEROID["Airy 1830",6377563.396,299.3249646,AUTHORITY["EPSG","7001"]],AUTHORITY["EPSG","6277"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4277"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",49],PARAMETER["central_meridian",-2],PARAMETER["scale_factor",0.9996012717],PARAMETER["false_easting",400000],PARAMETER["false_northing",-100000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27700"]],VERT_CS["BI height",VERT_DATUM["British Isles height ensemble",2005,AUTHORITY["EPSG","1288"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","9451"]],AUTHORITY["EPSG","9920"]]

Definition: MapServer - MAPfile

PROJECTION
	"proj=tmerc"
	"lat_0=49"
	"lon_0=-2"
	"k=0.9996012717"
	"x_0=400000"
	"y_0=-100000"
	"ellps=airy"
	"units=m"
	"vunits=m"
	"no_defs"
	"type=crs"
END

Definition: Mapnik

<?xml version="1.0" encoding="utf-8"?>
<Map srs="+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +units=m +vunits=m +no_defs +type=crs">
	<Layer srs="+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +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 ( 9920, 'EPSG', 9920, '+proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +units=m +vunits=m +no_defs +type=crs', 'COMPD_CS["OSGB36 / British National Grid + BI height",PROJCS["OSGB36 / British National Grid",GEOGCS["OSGB36",DATUM["Ordnance_Survey_of_Great_Britain_1936",SPHEROID["Airy 1830",6377563.396,299.3249646,AUTHORITY["EPSG","7001"]],AUTHORITY["EPSG","6277"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4277"]],PROJECTION["Transverse_Mercator"],PARAMETER["latitude_of_origin",49],PARAMETER["central_meridian",-2],PARAMETER["scale_factor",0.9996012717],PARAMETER["false_easting",400000],PARAMETER["false_northing",-100000],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Easting",EAST],AXIS["Northing",NORTH],AUTHORITY["EPSG","27700"]],VERT_CS["BI height",VERT_DATUM["British Isles height ensemble",2005,AUTHORITY["EPSG","1288"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],AXIS["Gravity-related height",UP],AUTHORITY["EPSG","9451"]],AUTHORITY["EPSG","9920"]]');