Geographical Information Systems (GIS) are software packages that analyze and classify data for a particular geographical location. This technology has many applications, "from predicting houses in danger of flooding to analysing crime patterns." The GIS Files, operated by Britain's national mapping agency, is a site that gives a good introduction to the basic concepts of GIS. A sequence of seven tutorials explain how the technology came about and how it works. The last chapter provides insight into what might be possible in the future. After looking over the GIS Files, readers should have a reasonable understanding of computer mapping processes and its benefits.
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