Geographic Information Systems

 Geographic Information Systems : 

A geographic information system (GIS) is a

 versatile innovation that stores geographic databases, supports spatial data analysis, and facilitates the production of digital maps. It is a computer-based technology that assists the user in the entry, analysis, manipulation, and display of geographic information derived from combining any number of digital map layers, each composed of a specific thematic map .

          It is a computer system  that analyses and displays geographically referenced information.

Uses of GIS : 

1.A GIS can be used to make the scale and map projection ofthese map layers identical, thus allowing the information fromseveral or all layers to be combined into new and more meaningfulcomposite maps.  

2.GIS is especially useful to geographers

as they work to address problems that require large amounts of spatial data from a variety of sources.

3.Many geographers are employed in careers that apply GIS technology. The capacity of a GIS to integrate and analyze a wide variety of geographic information, from census data to landform characteristics, makes it useful to both human and physical geographers.

4.With nearly unlimited applications in geography and other disciplines, GIS will continue to be an important tool for spatial analysis.

Benefits of a GIS :

         A GIS can display any layer or any combination of layers, geometrically registered (fitted) to any map projection and at any scale that you specify.

        A GIS can digitally overlay any set of thematic map layers that are needed.