The contour interval on a topographic map is selected based on:
Choose the correct answer
Budget only
Scale of map, nature of terrain (flat vs hilly), and purpose of survey
Colour of the soil
Number of surveyors
Correct Answer
B. Scale of map, nature of terrain (flat vs hilly), and purpose of survey
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Contour interval CI = (contour value) based on: scale (CI = 0.1 x scale denominator / 1000 m for hilly; smaller CI for flat ground); typical values: 1:50,000 map with 20 m CI for hilly, 5 m for flat. Large CI for reconnaissance; small CI for detailed engineering designs.
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