How is data matched at the external edges to positional accuracy improved blocks?
Whatever the size of the block that has undergone positional accuracy improvement (PAI), there will be an external edge to it and, during the course of the (PAI) programme, this may sometimes abut a 1:2500 scale map tile that has yet to be improved. Where this occurs, there will inevitably be some discrepancies between detail across tile edges. At the external edge, any improved data (where the position has changed and the feature extends beyond the edge) is improved into the adjacent 1:2500 map tile (collar tile) if it is currently unimproved. This prevents movement again at the tile edge of the improved map when its neighbour is subsequently positional accuracy improved. As a consequence this results in small positional shifts on the unimproved tile to certain lines of detail. This feathering of changes into the collar tile are restricted to the point where decreasing shifts for PAI no longer need to be made to still meet relative accuracy standards or to where revision can be taken
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