OSGB36 is a coordinate system used for mapping in Britain, based on the Airy 1830 ellipsoid and the OSGB36 datum.
OSGB36 is a coordinate system used for mapping in Britain, based on the Airy 1830 ellipsoid and the OSGB36 datum.
Airy 1830 is an ellipsoid that best fits Britain, with a semi-major axis of 6377563.396 metres and a flattening of 1/299.3249646.
The OSGB36 datum is set of conventions that define the origin, orientation and scale of the OSGB36 coordinate system, based on the position and orientation of the Airy 1830 ellipsoid at the fundamental point of the Royal Observatory, Greenwich in 1936.