Knowing how to read a topographic map is an essential skill for navigating the backcountry. Make sure you understand how to follow a topographic map before your hike — especially if you plan to be in a remote area.
Here we’ll cover the basics and provide some online sources for finding topographic hiking maps. We will also feature some external sites that teach map skills & orienteering in greater detail.
Topographic maps render the three-dimensional ups and downs of the terrain on a two-dimensional map. The topographic map shows a cross-sectional view of the terrain, known as a topographic profile.
If you sliced through and pulled back a portion of the earth, and viewed it from the side, the surface would be a topographic profile. In this example, the concentric circle shows the profile of a hill.
Topographic maps describe the shape of the land and portray both natural and significant manmade features. These include mountains, valleys, waterways, dams, roads, boundaries, and bridges.
Due to their level of detail, the topographic map remains an indispensable tool for measuring and navigating the terrain.
A topographic map uses three major factors to help you visualize and navigate the terrain:
Once you understand how to decipher and combine these elements, not only will you become more skilled in navigating the trail, but you’ll have a more accurate view of the surrounding territory. For instance, if your knees start aching, and the map shows the elevation rises on the trail ahead, you can look at the topographic map for an alternative trail with less of a climb. And if you are looking for a good spot to pitch a tent, you can look at the map for a flatter area.
Brown contour lines represent the shape and elevation, or contours of the land. The contour lines connect points of equal heights, so elevation remains constant if you physically follow a contour line. And, if you cross these contour lines, you will either be climbing or descending.
The equal spacing between the contour lines is the contour interval. Depending on the terrain, this interval may depict a small vertical rise or a large vertical rise. For instance, in a mountainous area, a 100-foot contour interval will indicate a 100-foot elevation rise for each line. The contour interval is defined in the margin area of the map.
To determine elevation, pay attention to the amount of space in between the contour lines. The lines get closer together when there is a steep slope, representing an ascent or descent. The only way to tell if the slope is going up or down is to look at the elevation numbers printed on the index contour lines. If the numbers are increasing, the slope goes up which means you will be climbing; if decreasing, the slope goes down, and you will be descending.
Features of the land, either man-made or natural, are represented by colored symbols. See the margin of the map for a definition of the symbols. Most topographic maps use standard colors to represent the following features:
Black: man-made features such as trails, railroads, wilderness boundaries, and roads
Blue: Waterways such as a river, lake, stream, or swamp
Green: Vegetation or cleared vegetation, such as forests, vineyards, and orchards
Brown: Contour lines, contour elevations
Red: Main roads, urban development, and unique features
See a complete list of topographic symbols
Scale refers to the relationship between distance on a map and the corresponding distance on the ground. The scale represents this ratio in a fraction format. For instance, a 1:24,000 scale means 1 unit of measure on the map equals 24,000 of the same units of measure on the ground. Therefore, a 1:24,000 scale means that one inch on the map equals 24,000 inches (2,000 feet or 609.6 meters).
There are many different map scales produced. The United States Geological Survey (USGS) provides the most widely distributed topographic maps in the U.S. These are the 7.5-minute 1:24,000 scale, where 1 inch represents 2,000 feet. A scale of 1:25,000 is the standard for countries that use metric units, where 1 centimeter = 0.25 kilometers. Other common scales include the 1:100,000 and the 1:250,000 scale.
Medium-scale maps (e.g., 1:24,000) cover smaller areas in greater detail, whereas smaller-scale maps (e.g., 1:250,000) cover larger areas in less detail. The most important consideration in choosing a map is picking the correct scale. Ensure the scale will provide the level of detail required for its intended use. A few examples:
Look for maps printed on durable poly art material, which is tear-resistant and waterproof.
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