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Symbology is defined in geographic information systems (GIS) as the set of conventions, rules, or encoding systems that define how geographic information is represented with symbols on a map. A characteristic of a map feature may influence the size, color, and shape of the symbol used.
Generically, a symbol is something such as an object, picture, written word, sound, or particular mark that represents something else by association, resemblance, or convention. For example, a red octagon may be a symbol for "STOP". On maps, crossed sabres may indicate a battlefield. Numerals are symbols for numbers (amounts). All language consists of symbols. Personal names are symbols representing individuals.
Maps typically include symbols that represent such features as streets, buildings, streams, and vegetation. Features are shown as points, lines, or areas, depending on their size and extent. Many features are shown by lines that may be straight, curved, solid, dashed, dotted, or in any ...
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