Question

What precautions will you take while drawing contours?

Answer 1

While drawing contours on a map, the following precautions should be taken:

1. Use uniform vertical interval: Keep the vertical interval, the difference in height between contours, constant across the map.
2. Smooth curves: Contour lines should be presented as smooth, flowing curves rather than sharp or broken lines, unless they represent cliffs or ridges.
3. Lines should not cross: Contour lines must never meet or cross each other, with the exception of overhanging cliffs.
4. Join equal elevations: Ensure that each contour line appropriately connects locations of equal height.
5. Use appropriate scale: Determine the appropriate scale and contour interval based on the terrain’s characteristics.
6. Label clearly: To provide clarity, contour lines should be clearly labelled with their corresponding elevations.
7. Spacing reflects slope: Make sure the distance between contours reflects the slope closer for steep slopes and wider for moderate slopes.