What is the contour interval on the topography map?

The contour interval refers to the vertical distance or difference in elevation between consecutive contour lines on a topographic map. Identifying the correct contour interval is crucial for understanding the steepness of the terrain and for navigation purposes.

If 20 feet is designated as the contour interval, it indicates that each contour line represents a change of 20 feet in elevation from one line to the next. This means that if you move from one contour line to the next on the map, the elevation increases or decreases by 20 feet. This interval can help assess the gradient of the area, which is particularly useful in search and rescue operations where terrain may affect accessibility and visibility.

Understanding contour intervals allows for better planning and execution of SAR missions by helping teams gauge the level of difficulty they may face in different sections of the terrain. A proper assessment of these intervals assists in determining how steep the slopes are, which can affect movement, safety, and the potential for locating a missing person or item.

Carefully interpreting the contour intervals is essential for effectively utilizing topographic maps in various applications, including outdoor navigation and rescue operations.