Map Symbols
In a very real sense, the whole map is a symbol, representing the world or a part of it. It is a reduced representation of the earth; each of the world's features--cities rivers, etc.-is represented on the map by a symbol. Map symbols may take the form of points, such as dots or squares (often used for cities, capital cities, or points of interest), or lines (roads, railroads, rivers). Symbols may also occupy an area, showing extent of coverage (terrain, forests, deserts). They seldom look like the feature they represent and therefore must be identified and interpreted. For instance, the maps in this atlas define political units by colored tints. Neither the colors nor the boundary lines are actually found on the surface of the earth, but because countries and states are such important political components of the world, strong symbols are used to represent them. On the maps in this atlas the surface configuration of the earth is represented by hill-shading, which gives the three-dimensional impression of landforms. This terrain representation conveys a realistic and readily visualized impression of the surface. A complete legend to the right provides a key to the other symbols on the maps in this atlas.
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