Sistemas de Informação Geográfica Algumas Defi niçõ es: Os SIG são vistos como um conjunto de ferramentas: …a powerful set of tools f or storing and retrievi ng at will, transforming anddisplaying spatia l data from the real world for a part icular set of pur poses… (Burrough, 1986, p.6) … automated systems for the capture, storage, retrieval, analysis, and display of spatial data… (Clarke, 1995, p.13) Os SIG são vistos como Sistemas de Informação: … an inf ormat ion sys tem that i s design to work with da ta refe renced by spat ial or geographic coordinates. In other words, a GIS is both a database system with specific capabilities for spatially-referenced data, as well as a set of operations for working with the dat a… (Jack Estes and Jeffrey Star, 1990, p.2) A Geographic Informat ion System is a special case of I nformation systems where the database consist of observations on spatially case of uted features, activities or events, which are definable in space as points, lines or areas. A Geographic Information System manipulates data abo ut these points, lines and areas to retrieve data for ad hoc queries and analysis. (Duecker, 1979, p.106)
