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Snapping, in digitising, means

  • A.breaking a long line into shorter segments
  • B.removing every duplicate feature from a layer
  • C.converting a curve into a series of arcs
  • D.forcing nearby vertices to a common position

Answer: D

Correct answer: forcing nearby vertices to a common position

Snapping pulls a vertex within a stated tolerance onto an existing one, so that lines meant to meet actually share a point rather than merely appearing to. Without it a digitised network is full of tiny gaps and overshoots, invisible on screen and fatal to any analysis that depends on connectivity.

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