Ordnance Survey is the national mapping agency of Great Britain, they maintains around 234 000 km≤ of topographic information, ranging from dense urban conurbations to mountain and moorland areas. In order that customers benefit from the most up-to-date mapping, it is essential that they regularly update their data. They constantly strive to improve the quality, accuracy and content of their products even further.
Revision policy for large-scale products link: OS Revision Policy PDF
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