Sistema de información geográfica -- See Geographic information systems Refers to combined software and hardware systems that relate and display collected information concerning phenomena associated with location relative to the Earth. They often have the ability to overlay temporal information or information related to geology, ecology, weather, land use, demographics, transportation, or other data on top of existing geographic base data. The data are typically presented in the form of maps or tables, displayed in color on a computer screen or printed out.
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Sistema de irrigación -- See Irrigation systems Artificial systems that water land to supply moisture for plant growth.
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Sistema de Posicionamiento Global -- See Global Positioning System Refers to the technology originally developed by the U.S. Department of Defense and consisting of 24 satellites that continuously transmit signals globally. In conjunction with receivers on Earth, the system uses triangulation to quickly and accurately determine the latitude, longitude, and altitude of a point on or above the Earth's surface. In addition to military applications, the system is primarily used to gather spatial data needed for making maps and to calculate geographic positions for travelers on Earth who have GPS receivers. The system was originally called "NAVSTAR" (Navigation System with Timing And Ranging).
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Sistema de seguridad -- See Security systems Building systems that secure or protect a premises from unwanted intruders.
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Sistema de seguridad electrónico -- See Electronic security systems Designates security systems dependent on electronic devices, such as card readers.
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Sistema de telecomunicaciones -- See Telecommunication systems Systems for communicating at a distance, often a collection of individual communications networks, transmission systems, relay stations, subsidiary stations, data terminal equipment, and other facilities for disseminating information. Examples include telephone, telegraph, radio, television, optical communications, internet, etc.