What useful plot can be derived from a contour map?

What useful plot can be derived from a contour map?

• A. Profile plot
• B. Elevation diagram
• C. Heat map
• D. Slope map

Answer: (A)

Contour maps encode how elevation changes over horizontal space, so a cross-sectional view along a line is a natural, direct way to visualize that terrain. This cross-section, called a profile plot, shows elevation as a function of distance along a chosen transect. To make it, pick a straight line across the map, read off or interpolate the elevations where that line intersects the contour lines, and plot those elevations against distance along the line. The resulting curve clearly displays hills and valleys, flat stretches, and where slopes are steep or gentle—the contour line spacing tells you that: closely spaced lines indicate steep rises, widely spaced lines indicate gradual slopes.

This is the most straightforward plot you can derive directly from a contour map. A heat map represents a different kind of information (overall intensity over an area) and isn’t a direct cross-section of elevation. An elevation diagram isn’t a standard, universally used term for a plot derived from contours, and a slope map comes from processing elevation data to show gradient over an area, which is a broader, map-based representation rather than a single transect profile.