Quick Answer
To estimate travel time on a route using elevation data, you can utilize contour lines on a topographic map to calculate the total elevation gain, then apply a formula that accounts for factors like terrain difficulty and your physical condition. This approach is particularly useful when route information is lacking. It provides a reasonable estimate of travel time.
Understanding Contour Lines
Contour lines on a topographic map represent the elevation of the terrain, with a standard interval of 20 feet (6 meters) or more. By counting the number of contour lines between two points, you can estimate the total elevation gain. For example, if the contour interval is 20 feet and there are 10 contour lines between two points, the total elevation gain is approximately 10 x 20 = 200 feet.
Calculating Elevation Gain
To estimate elevation gain, start by measuring the horizontal distance between two points (in feet or meters). Then, count the number of contour lines between these points. Multiply the number of contour lines by the contour interval to get the total elevation gain. For example, if the horizontal distance is 1 mile (5,280 feet) and there are 10 contour lines between two points with a contour interval of 20 feet, the total elevation gain is approximately 10 x 20 = 200 feet.
Applying Difficulty Factors
When calculating travel time, you must consider factors like terrain difficulty, your physical condition, and the weight of your backpack. A more accurate estimate can be obtained by applying a difficulty factor to the elevation gain. For example, if the elevation gain is 1,000 feet, a difficulty factor of 2 might be applied for a steep climb or a heavily loaded backpack, resulting in an estimated total elevation gain of 2,000 feet. This value can then be used to estimate travel time based on your physical condition and the terrain difficulty.
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