![]() Find the difference between the two elevations. The highest number shows the uphill rise. These index lines will be marked with their elevation.įind the elevations of two adjacent index lines. Knowing how to calculate the contour interval becomes a useful skill. On most maps, each fifth contour line, shown as a heavier or darker line, is an index line or index contour. Top-Down Construction | What Is a Top-Down Construction | Advantages & Disadvantages of Top-Down ConstructionĪ map legend usually identifies the contour interval on the map, but sometimes only part of a map is available. ![]()
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