Ordnance Survey (Author)
Established in 1791, Ordnance Survey is the world's leading producer of maps. Their vast collection of geographic data has mapped the location of every fixed physical object in Great Britain, from the ground upwards, to within one metre accuracy. While their world-famous and much-loved paper maps remain important, OS produce digital map data, online route planning and sharing services and mobile apps, plus many other location-based products so you know exactly where you are.
www.ordnancesurvey.co.uk