The geographical information system is a computer-based tool used to present, describe and analise data regarding physical data such as land, zoning, and area on an electronic map in the computer. As it presents data more accurately,this tool is used by a number of development agencies. The GIS presents two important data such Vector and also rector data. Vector data consist of a number of information analising on computer software. This information is presened in three diffrent format such as point, polygon an line. Ususallly these kind of information is linked by coordinates X and Y. Roster data is a cell-based representation of map features and are data consisting of satelite imagery,aerial photograph,and scanned pictures of a specific area or location.
For urban Planners, or other planning disciplines, the GIS is a very handy tool as it can be used easily and more accurately to make a spatial analysis, attribute analysis, conbined analysis of both spatial and atribute ( Boolean). The GIS is also handy for boffering data, measuring distance of a two areas, matching specific addresses. It is also used for combining and comparing spatial features on two or more map layers,and also used for determining the appropriateness of a given area for a particular use.
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