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Interpolation, in thematic mapping, is the process of

  • A.estimating values between known observations
  • B.converting an area value into a point value
  • C.reducing the number of classes in a legend
  • D.transferring a map from one projection to another

Answer: A

A surface of rainfall or temperature is built by estimating values at places where no reading was taken. The method chosen, whether inverse distance or kriging, changes the surface, so it forms part of the map's documentation.

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