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The contour lines helps to illustrate 3D information using 2D representations, hence, you may evaluate the changes in height of a terrain on a map. The characteristic of a contour line is that the points located on it have all the same height.
The contour lines, that represent points located at the same height, help you to make connections with other lines having constant characteristics, such as isotherms (lines of constant temperatures) or isobars (lines of constant pressure)
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