Quick Answer
Some areas may appear flat on a map even if they're not due to a process called contour smoothing, which rounds off minor hills and valleys to simplify the map's representation.
Understanding Contour Smoothing
Contour smoothing is a technique used in cartography to reduce the number of contour lines on a map, making it easier to read and understand. This process involves analyzing the terrain and removing minor features, such as small hills and valleys, to create a smoother appearance. The resulting map may show areas as flat that are actually not, as the minor features are lost in the smoothing process.
How Contour Smoothing Affects Map Accuracy
The smoothing process can affect the accuracy of a map, particularly in areas with complex terrain. In these cases, the map may not accurately represent the terrain, leading to confusion for users who rely on the map for navigation. To give you an idea of the scale, a map with a contour interval of 10 meters may smooth out features as small as 2-3 meters, which can be significant in areas with dense vegetation or rocky terrain.
How to Identify Contour Smoothing on a Map
To identify contour smoothing on a map, look for areas with an unusual number of contour lines, such as multiple lines that are very close together. This can be an indication that the map has been smoothed, and the minor features have been lost. Additionally, check the contour interval, which is the distance between each contour line. A lower contour interval, such as 5 meters, will show more detail than a higher interval, such as 20 meters.
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