Ordnance Survey National Grid - Summary Parameters of The Coordinate System

Summary Parameters of The Coordinate System

Datum: OSGB36
Map projection: Transverse Mercator
True Origin: 49°N, 2°W
False Origin: 400 km west, 100 km north of True Origin
Scale Factor: 0.9996012717+
EPSG Code: EPSG:27700
Ellipsoid: Airy 1830
Semi-major axis a: 6377563.396 m
Semi-minor axis b: 6356256.909 m
Flattening (derived constant): 1/299.3249646

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