Question

With respect to the representation of natural features on a topographical map, consider the following statements and choose the option that comprises an incorrect one.

• A. Contour lines: They are imaginary lines joining places having the same elevation above the sea level.
• B. Spot height: Heights of inaccessible areas are shown by contours drawn in broken lines.
• C. Triangulated height: Height of a point surveyed by the triangulation method.
• D. Form lines: The height of a particular point above the sea level.

Answer 1

Answer: (B), (D)

Form lines: The height of a particular point above the sea level.

Representation of relief, height or elevation:

1. Spot height: The height of a particular point above the sea level.
2. Triangulated height: Height of a point surveyed by the triangulation method; indicated by a small triangle beside the number showing height.
3. Contour lines: Lines shown in brown, joining places of equal height above the sea level. The distance between the two contours is normally 20 m.
4. Form lines: Heights of inaccessible areas are shown by contours drawn in broken lines. These indicate approximate heights.
5. Depression: Often found in sandy regions at the top of a mound or dune, where the wind easily blows the sand away thus, leaving a hollow.