Lake george contour map10/3/2023 ![]() You can keep it on the screen while you try our suggestions. Move the mouse around and try clicking on things. To help you scale this short (we hope) learning curve, we have compiled this list of common tasks. If you haven't worked any mapping websites, operation might not be obvious to you. Especially sites as unique as Historic Aerials. The color black is represented in a number of features including: boundaries, buildings, bridges, viaducts, tunnels, crossings, control data, monuments, dams, piers, break waters, foreshore and offshore features, mine symbols, roads, highways, trails, railroads, drive-in theatres, oil sumps, telephone lines, pipelines and wells. ![]() Although, no longer used the color (purple) found on the historical topo maps represent feature changes. The five (5) plates include vegetation (green), water (blue), public land survey lines and densely built-up areas (red), roads and buildings (black), contours and other elevation features (brown). There are five (5) color plates which were used in the film-based reproduction process. In fact, there are nearly 200 features represented by unique symbols and separated into color groups. The USGS Topographic Maps use symbols or colors to represent features, and this Topographic Map Key explains what they mean.Ĭontour lines are distinctive to the topographic maps but there are other features shown on the maps including buildings, water and vegetation. Interpreting the colored lines, areas and other symbols is necessary in using the topographic maps. United States Geologic Service (USGS) Topographic Map Key (Legend)
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