Ordnance Survey MasterMap and VectorMap Local
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Ordnance Survey's website states that MasterMap datasets are created from a single master dataset that is refreshed regularly (currently every 6 weeks). In reality the whole 230,000km2 of the country is updated on a rolling program. This means that areas of greatest change, like cities, will be amended first...Explore the subscription options here to get full access to isurv, including downloads.
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