Contour Lines and Elevation Estimation

This video tutorial explains how to determine the actual or estimated elevation of points on a topographic map. It covers identifying contour intervals, calculating elevations for specific points, and estimating elevations for points not directly on contour lines. The video also previews the next topic on estimating slope steepness using contour lines.

What is the primary goal of the video?

• To discuss the uses of topographic maps

• To teach how to draw a topographic map

• To determine the elevation of points on a topographic map

• To explain the history of topographic maps

What elements are missing from the topographic map discussed in the video?

• Legend and title

• Elevation markers and grid lines

• Map scale and compass rose

• Contour lines and index contours

How is the contour interval determined on the map?

• By measuring the distance between contour lines

• By counting the number of contour lines between index contours

• By using a compass rose

• By checking the map legend

What is the contour interval on the map?

• 200

• 150

• 100

• 50

What is the elevation of Point A?

• 1700

• 1200

• 1000

• 1500

How is the elevation of Point B determined?

• By measuring the distance from Point A

• By using a compass

• By using a labeled index contour

• By extrapolating from nearby index contours

What is the elevation of Point B?

• 1600

• 1500

• 1700

• 1800

What is the elevation of Point C?

• 1000

• 1200

• 1400

• 1600

How is the elevation of Point C determined?

• By estimating from the trend of contour lines

• By using a labeled index contour

• By measuring the distance from Point B

• By using a compass

What is the estimated elevation range for Point D?

• 900 to 1000

• 1100 to 1200

• 1000 to 1100

• 800 to 900