EPSG:9920 — OSGB36 / British National Grid + BI height

Compound · UK - Britain and UKCS 49°45'N to 61°N, 9°W to 2°E

Export Formats

OGC WKT

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"]
]

WKT2

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,ID["EPSG",9001]],
                    ID["EPSG",7001]
                ],
                ID["EPSG",6277]
            ],
            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",9102]],
                ID["EPSG",8801]
            ],
            PARAMETER[
                "Longitude of natural origin",
                -2,
                ANGLEUNIT["degree",0.0174532925199433,ID["EPSG",9102]],
                ID["EPSG",8802]
            ],
            PARAMETER[
                "Scale factor at natural origin",
                0.9996012717,
                SCALEUNIT["unity",1,ID["EPSG",9201]],
                ID["EPSG",8805]
            ],
            PARAMETER[
                "False easting",
                400000,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",8806]
            ],
            PARAMETER[
                "False northing",
                -100000,
                LENGTHUNIT["metre",1,ID["EPSG",9001]],
                ID["EPSG",8807]
            ],
            ID["EPSG",19916]
        ],
        CS[Cartesian,2,ID["EPSG",4400]],
        AXIS["Easting (E)",east],
        AXIS["Northing (N)",north],
        LENGTHUNIT["metre",1,ID["EPSG",9001]],
        ID["EPSG",27700]
    ],
    VERTCRS[
        "BI height",
        ENSEMBLE[
            "British Isles height ensemble",
            MEMBER["Malin Head",ID["EPSG",5130]],
            MEMBER["Belfast Lough",ID["EPSG",5131]],
            MEMBER["Ordnance Datum Newlyn",ID["EPSG",5101]],
            MEMBER["Ordnance Datum Newlyn (Offshore)",ID["EPSG",1164]],
            MEMBER["Ordnance Datum Newlyn (Orkney Isles)",ID["EPSG",5138]],
            MEMBER["Lerwick",ID["EPSG",5140]],
            MEMBER["Stornoway",ID["EPSG",5144]],
            MEMBER["Douglas",ID["EPSG",5148]],
            MEMBER["St. Marys",ID["EPSG",5147]],
            ENSEMBLEACCURACY[0.4],
            ID["EPSG",1288]
        ],
        CS[vertical,1,ID["EPSG",6499]],
        AXIS["Gravity-related height (H)",up],
        LENGTHUNIT["metre",1,ID["EPSG",9001]],
        GEOIDMODEL["ETRS89 to BI height (1)",ID["EPSG",9914]],
        GEOIDMODEL["ETRS89 to BI height (2)",ID["EPSG",9916]],
        GEOIDMODEL["ETRS89 to BI height (3)",ID["EPSG",9918]],
        ID["EPSG",9451]
    ],
    ID["EPSG",9920]
]

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

Proj4js

How to add a projection to 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");

JSON

{
  "type": "CoordinateReferenceSystem",
  "code": 9920,
  "name": "OSGB36 / British National Grid + BI height",
  "kind": "compound",
  "area": "UK - Britain and UKCS 49°45'N to 61°N, 9°W to 2°E",
  "unit": null,
  "bbox": [
    49.75,
    -9.01,
    61.01,
    2.01
  ],
  "proj4": "+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"
}

PostGIS

How to add a projection to 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"]]');

MapServer

How to add a projection to MapServer? →

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

GeoServer

How to add a projection to 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"]]

Frequently Asked Questions

How do I add EPSG:9920 to GeoServer?

Add the following definition to your GeoServer configuration:

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"]]

Read the full GeoServer guide →

How do I add EPSG:9920 to PostGIS?

Add the following definition to your PostGIS configuration:

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"]]');

Read the full PostGIS guide →

How do I add EPSG:9920 to MapServer?

Add the following definition to your MapServer configuration:

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

Read the full MapServer guide →

How do I use EPSG:9920 with Proj4js?

Add the following definition to your Proj4js configuration:

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");

Read the full Proj4js guide →