American Institute of Certified Planners (AICP) Practice Exam

What do contour lines represent on a topographical map?

1. The zoning districts of a municipality

2. The elevation and slope of the land

3. Property boundaries and easements

4. Statistical data for land use

The correct answer is: The elevation and slope of the land

Contour lines on a topographical map are a crucial feature used to represent the elevation and slope of the land. Each line connects points of equal elevation, indicating how high or low the terrain is relative to a standard reference point, typically sea level. The spacing between these lines illustrates the steepness of the slope: closely spaced lines indicate a steep slope, while lines that are farther apart suggest a more gradual incline. Understanding contour lines is fundamental for planners and geographers as it helps them visualize the three-dimensional landscape on a two-dimensional surface. They allow for important assessments such as drainage patterns, potential buildable areas, and challenges related to erosion or flooding. The elevation information gleaned from contour lines is critical for various applications, including land development, infrastructure planning, and environmental conservation efforts. While zoning districts, property boundaries, and statistical data may be important aspects of land management and planning, they do not convey the specific topographical features that contour lines provide.