Each customer opts to receive polygons in
either a 'topological' or an 'independent' format - the result after
translation is the same for the initial supply. OS MasterMap does not
use tiles, but is supplied in chunks that contain all the features
wholly or partly within arbitrary squares. As a result, adjacent chunks
contain duplicate features. Features overlapping the edges of chunks are
identified and de-duplicated. Each feature is identified by its TOID
and version number. These are suitable for associating your own
information, and each feature includes comprehensive attribute data.
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