![]() Highest point in Brengle Terrace Park (white area near center-west portion of map) e. ![]() Water tank (far northeastern comer of map) d. Lake San Marcos (very bottom of map spot elevation given) c. San Marcos Junior High School (bottom center of map) b. Also, it helps to zoom in quite a bit when answering these questions. Before you begin, check the contour interval at the bottom of the map. On the 1996 San Marcos Quadrangle found in our Canvas module find the approximate elevation for the following locations. View the legend at any time to review them. As with spot elevations, the exact benchmarked location should be marked with a "x." There are many other symbols on topographic maps. With benchmarks, the elevation is preceded by the initials BM, such as "BM1224". Sometimes the elevation is followed by the letter T, such as "856T". Spot elevations will simply show the elevation for a particular point, accompanied by a " x " to mark the exact spot. FIGURE 1: Estimating elevation between contours' Elevation can also be denoted on a map as spot elevations and benchmarks. while the approximate elevation for location " Y " = 45 ft. In Figure 1, the approximate elevation for location " X " = 70 ft. contour interval might have a sequence of contour lines at 20 ft, 40 ft, 60 ft, 80 ft, and higher as needed. ![]() Therefore, a topographic map with a 20 ft. For example, a common contour interval used is 20 ft. Contour lines are drawn with a constant elevation interval. Topography is a term referring to the general shape of the land surface. Their primary purpose is to allow us to interpret the elevation and topography for any point or region. Contour lines are lines drawn at a constant or equal elevation on a topographic map.
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