EPSG:CODE

EPSG:4277 — OSGB36

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

Export Formats

OGC WKT
GEOGCS[
    "OSGB36",
    DATUM[
        "Ordnance_Survey_of_Great_Britain_1936",
        SPHEROID["Airy 1830",6377563.396,299.3249646],
        EXTENSION["PROJ4_GRIDS","OSTN15_NTv2_OSGBtoETRS.gsb"]
    ],
    PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],
    UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],
    AUTHORITY["EPSG","4277"]
]

Related Coordinate Systems

Available Transformations (12)

Transformation Source → Target Accuracy (m)
OSGB36 to ETRS89 (1)
4277 → 4258 0.03
OSGB36 to ETRS89-GBR [OSNet v2009] (2)
4277 → 11009 0.03
OSGB36 to WGS 84 (7)
4277 → 4326 1
OSGB36 to WGS 84 (9)
4277 → 4326 1
OSGB36 to WGS 84 (6)
4277 → 4326 2
OSGB36 to ED50 (1)
4277 → 4230 2
OSGB36 to WGS 84 (8)
4277 → 4326 3
OSGB36 to WGS 84 (2)
4277 → 4326 10
OSGB36 to WGS 84 (4)
4277 → 4326 18
OSGB36 to WGS 84 (1)
4277 → 4326 21

Other CRS using Ordnance Survey of Great Britain 1936

Frequently Asked Questions

How do I add EPSG:4277 to GeoServer?

Add the following definition to your GeoServer configuration: 

4277=GEOGCS["OSGB36",DATUM["Ordnance_Survey_of_Great_Britain_1936",SPHEROID["Airy 1830",6377563.396,299.3249646],EXTENSION["PROJ4_GRIDS","OSTN15_NTv2_OSGBtoETRS.gsb"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4277"]]
Read the full GeoServer guide →

How do I add EPSG:4277 to PostGIS?

Add the following definition to your PostGIS configuration: 

INSERT INTO spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
VALUES (4277, 'EPSG', 4277, '+proj=longlat +ellps=airy +nadgrids=OSTN15_NTv2_OSGBtoETRS.gsb +no_defs +type=crs', 'GEOGCS["OSGB36",DATUM["Ordnance_Survey_of_Great_Britain_1936",SPHEROID["Airy 1830",6377563.396,299.3249646],EXTENSION["PROJ4_GRIDS","OSTN15_NTv2_OSGBtoETRS.gsb"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4277"]]');
Read the full PostGIS guide →

How do I add EPSG:4277 to MapServer?

Add the following definition to your MapServer configuration: 

PROJECTION
  "+proj=longlat"
  "+ellps=airy"
  "+nadgrids=OSTN15_NTv2_OSGBtoETRS.gsb"
  "+no_defs"
  "+type=crs"
END
Read the full MapServer guide →

How do I use EPSG:4277 with Proj4js?

Add the following definition to your Proj4js configuration: 

proj4.defs("EPSG:4277", "+proj=longlat +ellps=airy +nadgrids=OSTN15_NTv2_OSGBtoETRS.gsb +no_defs +type=crs");
Read the full Proj4js guide →