Anchoring
I just heard a really interesting talk by Antony Galton and James Hood here at GIScience. They developed a model for vague spatial information. For instance, it is hard to define the boundaries of central London. What we do know though is that central London lies inside greater London, and that the most important subway stations are inside central London. Spoken in anchoring terms, central London is anchored in greater London, and anchored over the subway stations of Picadilly Circus, Notting Hill Gate, etc. So the basic idea is to anchore vague spatial information in certain spatial information, and thus make it a bit more certain. This approach finally allows us to include these vague data in computations now.
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