EPSG:4278 OSGB70
Geographic system in latitude and longitude, in use: UK - Great Britain onshore and nearshore; Isle of Man. Datum, ellipsoid and transformation to WGS 84 below.
EPSG publishes no simple transformation to WGS 84 for this datum: conversion works on the ellipsoid alone and can be off by tens of metres.
| Code | EPSG:4278 |
|---|---|
| Name | OSGB70 |
| Type | Geographic system |
| Area of use |
UK - Great Britain onshore and nearshore; Isle of Man United Kingdom (UK) - Great Britain - England and Wales onshore, Scotland onshore and Western Isles nearshore including Sea of the Hebrides and The Minch; Isle of Man onshore. |
| Bounds | W -8,82° · S 49,79° · E 1,92° · N 60,94° |
| Countries | United Kingdom |
| Datum | OSGB 1970 (SN) |
| Ellipsoid | Airy 1830 a = 6377563.396 m · 1/f = 299.3249646 |
| Unit | degree (Lat north, Lon east) |
| Transformation to WGS 84 | No simple transformation published (ellipsoid alone) |
| Scope | Geodesy. |
proj4 definition
+proj=longlat +a=6377563.3959999997 +rf=299.3249646 +no_defsPaste it into QGIS, proj4js, PostGIS (spatial_ref_sys) or GDAL. +towgs84 carries the EPSG transformation to WGS 84; the official code stays EPSG:4278.
WKT (ESRI format, the .prj content)
GEOGCS["GCS_OSGB_1970_SN",DATUM["D_OSGB_1970_SN",SPHEROID["Airy_1830",6377563.396,299.3249646]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]Other systems — United Kingdom
- EPSG:2157IRENET95 / Irish Transverse Mercator
- EPSG:2158IRENET95 / UTM zone 29N
- EPSG:4173IRENET95
- EPSG:4188OSNI 1952
- EPSG:4277OSGB36
- EPSG:4279OS(SN)80
- EPSG:4299TM65
- EPSG:4300TM75
- EPSG:9299HS2-IRF
- EPSG:9300HS2 Survey Grid
- EPSG:9364TPEN11-IRF
- EPSG:9367TPEN11 Grid
- EPSG:9372MML07-IRF
- EPSG:9373MML07 Grid
- EPSG:9384AbInvA96_2020-IRF
- EPSG:9387AbInvA96_2020 Grid
- EPSG:9453GBK19-IRF
- EPSG:9456GBK19 Grid
Source: EPSG registry v11.022 (IOGP), through the PROJ database. Always check a code on epsg.org before contractual work.