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The chief problem with a choropleth map that uses too many classes is that

  • A.the map can no longer be printed in colour
  • B.the areal units must all be the same size
  • C.adjacent tones become hard to tell apart
  • D.the underlying data are altered by classing

Answer: C

Beyond roughly seven steps most readers cannot match a shade on the map to the right box in the legend. Fewer classes read more clearly, at the cost of grouping together values that genuinely differ. Between four and seven classes is the usual compromise.

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