'Contour interval' selection for a topographic survey depends on:
Choose the correct answer
Only the surveyors'' experience
Map scale, terrain relief, and purpose — large scale detailed engineering survey uses small CI; small scale planning uses large CI
Number of available survey instruments
Only the drawing paper size
Correct Answer
B. Map scale, terrain relief, and purpose — large scale detailed engineering survey uses small CI; small scale planning uses large CI
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Contour interval CI = difference in elevation between successive contours. Selection factors: (1) Scale of map (smaller scale → larger CI); (2) Nature of terrain (hilly = large CI, flat = small CI); (3) Purpose (detailed engineering = small CI 0.5–1 m; planning = 5–10 m); (4) Resources (time and cost). Typical: 1:1000 flat = 0.5–1 m CI; 1:50,000 hilly = 20 m CI. Small CI = more detail but more fieldwork.
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