I have just (last week) attended a lecture by Dr Waldo Tobler which addressed this very topic! Dr Tobler spoke at the AGI on the subject of Vector fields, and one of his examples was plotting inaccuracies of perceptions by students. In more detail, the exercise was to have students locate cities on a map of the USA. The errors for each city were then used to construct a map of distortion as a vector field - it is much easier to see than to attempt to describe! It provided a neat, quantitative method of depicting the inaccuracies of perception and/or knowledge.
To create such a map would require an approriate study in which people from the South East were asked to sketch a map showing some specified features. For each feature, the errors would be averaged, and then a vector field created. This vector field could then be used to distort a more comprehensive map, to provide a final output. You could do this using facilities in ARC/INFO (for example) with little difficulty.
Paul Cooper
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