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The word mapping has several senses:

• In cartography, creating maps depicting features on the earth's surface by various means, such as land surveying or photogrammetry.
• In mathematics and related technical fields, especially topology and geometry, it is some kind of function: see map (mathematics).
• In computer science, it can be any computable function, a procedure, or a table, e.g. relating a key to its value in an associative array.
• In computer games, the process of buiding a virtual environment for a new game.
• In formal logic, it is sometimes used for a functional predicate.
• In cognitive psychology, it is the relationship between a source domain and target domain, typically reflecting a conceptual metaphor.
• In genetics, gene mapping reveals the relative position of genes in a genome.

Specific senses of mapping in computer science include

• A correspondence between transient data structures (e.g. objects) to persistent data structures (e.g. relational data tables).
• In 3D computer graphics, texture mapping refers to the process of applying a 2D image to the surfaces of a 3D object.
• Many computers and operating systems implement some form of address mapping or page mapping, that automatically translates addresses from the address space of a computer process to actual addresses in real or virtual memory.
• Similarly cache mapping translates process addresses to locations in the cache memory of a processor.
• The technique of memory mapping allows convenient access to a peripheral device by means of memory read/write operations. (See also memory-mapped I/O.)
• Through network mapping one can obtain a visual or textual description of a computer network.
• Peripheral devices are assigned names or letters through device mapping.

External links

• Google Maps
• Master index of Open Source GIS applications
• R24 Maps
• StreetMaps Germany

See also: map, cartography

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