Topographic Maps Review

Front

What is a topographic map?

Back

A topographic map is a detailed and accurate graphic representation of cultural and natural features on the ground, showing elevation changes through contour lines.

Front

What do contour lines represent on a topographic map?

Back

Contour lines represent elevation and the shape of the terrain. Lines that are close together indicate steep slopes, while lines that are far apart indicate gentle slopes.

Front

How can you determine the direction of a stream on a topographic map?

Back

Streams flow downhill, and on a topographic map, they typically flow from higher elevation to lower elevation, often indicated by the V-shape of contour lines pointing upstream.

Front

What does a gradient measure?

Back

Gradient measures the steepness or incline of a slope, calculated as the change in elevation over the distance.

Front

How do you calculate the gradient between two points on a topographic map?

Back

Gradient = (Change in elevation) / (Horizontal distance). It is often expressed in feet per mile or meters per kilometer.

Front

What is the significance of elevation in topographic maps?

Back

Elevation indicates how high a point is above sea level, which is crucial for understanding terrain, water flow, and land use.

Front

What does it mean if a contour line forms a closed loop on a topographic map?

Back

A closed loop indicates a hill or a mountain. If the contour lines are hachured (with small lines on the inside), it indicates a depression.

Front

What is the purpose of a benchmark on a topographic map?

Back

A benchmark is a point of known elevation used as a reference for surveying and mapping.

Front

What is the difference between a hill and a valley on a topographic map?

Back

A hill is represented by concentric closed contour lines, while a valley is indicated by V-shaped contour lines that point uphill.

Front

How can you identify the steepness of a slope using contour lines?

Back

The closer the contour lines are to each other, the steeper the slope. Wider spaced lines indicate a gentler slope.