![]() Although there is no set standard on symbology for all maps, especially among thematic maps, various conventions (such as using contour lines for elevation or blue for water) are commonly followed for some classes of maps. When designing a map, the cartographer determines that a certain combination of these variables-a symbol (e.g., a dashed 0.5pt blue line)-represents a certain class of geographic feature (e.g., an intermittent stream). ![]() ![]() Map symbols are created by controlling Visual variables such as color, shape, and size the range of such variables was set forth by Jaques Bertin and subsequent cartographers. In this map the point represents populated places, the line represents roads, and the area represents urban areas Examples of point, line and area features on a map.
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