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Coordinate reference systems
AddressBase products have two coordinate reference systems (CRS) present within the data:
British National Grid (BNG): 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.
European Terrestrial Reference System 89 (ETRS89): ETRS89 is the EU-recommended frame of reference for European data and is represented as Latitude and Longitude values. ETRS89 is a horizontal spatial reference system only; it does not specify a vertical (height) reference system.
View our guide to coordinate systems in Great Britain for more information.
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