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An isopleth map differs from an isometric map in that its lines are interpolated from

  • A.elevations that were measured directly in the field
  • B.readings taken at fixed instrument stations
  • C.boundaries digitised from an older published sheet
  • D.values that apply to areas rather than points

Answer: D

Isometric lines join points where the value was actually measured, such as temperature at a weather station. Isopleths are built from area-based ratios assigned to a notional centre, which makes them a step further removed from observation.

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