What does an index contour line indicate when moving from a lower contour line to an upper contour line?

What does an index contour line indicate when moving from a lower contour line to an upper contour line?

• A. Decrease in elevation
• B. No change in elevation
• C. Increase in elevation
• D. Relative elevation of structures

Answer: (C)

An index contour line indicates an increase in elevation when moving from a lower contour line to an upper contour line. Contour lines are used on topographic maps to show the shape and elevation of the terrain. Each contour line represents a specific elevation above sea level, and index contour lines, which are typically marked with a number, are usually spaced at regular intervals to indicate significant changes in elevation. When navigating from a lower contour line to an upper contour line, you are moving upward in elevation, illustrating a rise in the landscape. This concept is fundamental for understanding terrain features and is critical for tasks such as route planning and land navigation in various operations.

An index contour line indicates an increase in elevation when moving from a lower contour line to an upper contour line. Contour lines are used on topographic maps to show the shape and elevation of the terrain. Each contour line represents a specific elevation above sea level, and index contour lines, which are typically marked with a number, are usually spaced at regular intervals to indicate significant changes in elevation.

When navigating from a lower contour line to an upper contour line, you are moving upward in elevation, illustrating a rise in the landscape. This concept is fundamental for understanding terrain features and is critical for tasks such as route planning and land navigation in various operations.