If you’ve ever looked at a topographic map, you’ve probably noticed the curvy lines that cover the surface of the map. These lines are called contour lines, and they represent changes in elevation on the ground. The contour interval is the vertical distance between adjacent contour lines on a map. Understanding the contour interval is important for anyone who needs to read a topographic map, whether for hiking, hunting, or any other activity that requires an understanding of the terrain.
What is the Contour Interval?
The contour interval is the vertical distance between adjacent contour lines on a map. For example, if the contour interval on a map is 20 feet, each contour line represents a change in elevation of 20 feet from the next line. Contour lines that are close together indicate steep terrain, while contouring lines that far apart indicate flatter terrain.
Why is the Contour Interval Important?
The contour interval is important because it allows you to understand the shape of the land on a topographic map. By understanding the contour interval, you can determine the slope of the terrain, identify ridges and valleys, and plan a route that avoids difficult terrain.
For example, if you’re planning a hiking trip, you might use a topographic map to plan your route. By looking at the contour lines, you can identify areas of steep terrain that might be difficult to climb. You can also identify ridges and valleys that might provide good views or shelter from the wind.
In addition to hiking, the contour interval is important for a variety of other activities, such as hunting, fishing, and mountain biking. Understanding the shape of the land can help you identify areas where you’re likely to find game, fish, or good trails.
How to Read a Contour Map
Reading a contour map is fairly straightforward once you understand the basics. Here are the steps to follow:
- Look for the contour interval on the map. This information is usually provided in the legend or key.
- Determine the elevation of the starting point of your trip. This can usually be done by looking at the elevation of a nearby town or city.
- Find the contour line on the map that represents the elevation of your starting point.
- Follow the contour lines to determine the slope of the terrain. Contour lines that are close together indicate steep terrain, while contour lines that far apart indicate flatter terrain.
- Identify ridges and valleys by looking for groups of contour lines that are close together or far apart, respectively.
- Use the contour lines to plan your route. Avoid areas of steep terrain if possible, and look for valleys and ridges that might provide good views or shelter from the wind.
Conclusion
In conclusion, the contour interval is an important concept to understand for anyone who needs to read a topographic map. By understanding the contour interval, you can determine the slope of the terrain, identify ridges and valleys, and plan a route that avoids difficult terrain. Whether you’re hiking, hunting, fishing, or mountain biking, understanding the shape of the land can help you make the most of your outdoor activities.
