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Coordinate reference system
Coordinate reference system
OS Open TOID and its associated geometry data layer use the British National Grid (BNG) coordinate reference system (CRS).
BNG uses the OSGB36 geodetic datum and a single Transverse Mercator projection for the whole of Great Britain. Positions on this projection are described using Easting and Northing coordinates in units of metres. The BNG is a horizontal spatial reference system only; it does not specify a vertical (height) reference system.
Please view our 'Guide to Coordinate Systems in Great Britain' for more information on CRSs.
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