The same is done for your target point within its own cluster (finding paths from all its border points to your actual destination).
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One farmer in Somerset told the BBC that he was living on a "knife edge" as his crops were days away from rotting in the floodwater.
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It then uses the standard Dijkstra algorithm on the detailed local map within your start cluster to find the best paths from your actual start location to all border points of that starting cluster.