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Discussion

Consider the following statements about interpreting a topographic sheet.
1. Several kinds of evidence should be weighed together.
2. An inference from a map is a hypothesis rather than a fact.
3. A map records everything present on the ground at the survey date.

  • A.3 only
  • B.1 only
  • C.All of them
  • D.1 and 2 only

Answer: D

The first two describe sound practice. The third ignores selection and generalisation, which mean a sheet shows what its specification called for and omits a great deal that was undoubtedly present on the ground when the surveyor passed.

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