Contour interval (CI) for a topographic survey is selected based on:
Choose the correct answer
Only the type of surveying instrument
Scale of map, purpose, accuracy required, and terrain steepness
Weather conditions during survey
Color of map
Correct Answer
B. Scale of map, purpose, accuracy required, and terrain steepness
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Contour interval (vertical distance between successive contours) depends on: scale of map, purpose, accuracy, and relief (terrain steepness). Steep terrain → larger CI; flat terrain → smaller CI. Typical: 1:25,000 scale map CI = 5 m or 10 m; engineering surveys 0.5–1 m. Formula guidance: CI ≈ H/500 (H = total relief, map).
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