The legend on the inside cover of the DeLorme Atlas and Gazetteer explains the colors and categories of information displayed on the map. Convert the metric units to traditional English units, and you'll discover that 40 meters is roughly 131 feet. Note that the contour intervals in the DeLorme Atlas and Gazetteer are in meters. Once you get the hang of it, you can see how the lines display the location of hills and valleys. Such maps show the elevation of mountains and valleys with contour lines, with the elevation differences represented by light brown lines illustrating the height of the land above sea level. The DeLorme Atlas and Gazetteer, like the 1:24,000 quadrangle (quad) maps of USGS, provides "topographic" (topo) maps.
Source: US Geological Survey (USGS), Warm Springs, VA 7.5-minute topographical map (2016) Topographic map showing contour lines near Warm Springs in Bath County (contour interval: 20 feet) If your background is in another discipline, this might provide a useful refresher. NOTE: if you are a geography major, this material will be "old hat" to you. Get Familiar With the Brown Lines on the Topographic Maps Get Familiar With the Brown Lines on the Topographic Maps
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