To determine the difference in elevation between two points, determine the. In addition to obeying the set contour interval for a map, contour lines should never branch (split) or simply end inside of the mapped region. Contour lines are the continuous brown lines found on topographic maps. Benchmark locations will normally be found in the area between contour lines. For example, a benchmark of 236ft will be found somewhere between the 230ft and 240ft contour line (if the contour interval is 10ft), or between the 235ft and 240ft contour line (if the contour interval is 5ft). These benchmarks are rarely located on a contour line and instead are usually identified by a black “x” or identified with the letters “BM” and with the elevations included in black numbers (as opposed to the brown numbers on index contours). Contour lines are the continuous brown lines found on topographic maps that give information about elevation. These surveyed points are exact elevations above sea level and are commonly used to mark the elevations of mountains, hilltops, road intersections, and airport runways. In addition to contour lines, topographic maps will also have benchmarks (actual surveyed points) in various locations on your map. Remember to use the contour lines to determine the elevations, and the bar scale on your map to measure the distance.
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