Question

What is the primary difference between a Contour Line and a Form Line?

• A. There is no difference; they are used interchangeably.
• B. Contour lines use the triangle symbol, while form lines use dots.
• C. Contour lines are only for mountains, while form lines are for valleys.
• D. Contour lines are solid (continuous), while form lines are broken (dashed).

Answer 1

Answer:

D. Contour lines are solid (continuous), while form lines are broken (dashed).

• The visual style distinguishes surveyed data (solid) from estimated data (broken). • Contour lines are isarithmic lines connecting points of equal, surveyed elevation based on a vertical datum. • Form lines are non-isarithmic sketches used to show topographical features like spurs or depressions that are visible to the eye but haven't been measured against sea level. • They do not necessarily follow the map's set contour interval.