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. In reality, the whole 230,000km2 of the country is updated on a rolling programme. This means that areas of greatest change, like cities, will be amended first and others with a lower priority,...Explore the subscription options here to get full access to isurv, including downloads.
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