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State whether the following is true or false.
Two tints that differ by 10 per cent are reliably distinguishable to a map reader.

  • A.False
  • B.True only at large scales
  • C.False only at small scales
  • D.True

Answer: A

Correct answer: False

Ten per cent is close to the limit of what a reader can judge on a printed sheet, and quite beyond it when the two tints are not adjacent. Steps of twenty per cent or more are needed for classes to be told apart reliably, which is one reason a choropleth map should carry few classes.

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