The aim of GIS is to store ...

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The aim of GIS is to store geographically refence data as different layers. These different data layers may be manipulated and visualy accessed as output data. The usefulness of output data, is depend on the input data. Using GIS for ground water quantity assessment is relatively old method, but while depending on the areal photos you need to get ground survey done for ground truths too. Geographical mapping id done and then you can study these map. I am posting here a paper which will give you a detail idea on that.http://upetd.up.ac.za/thesis/submitted/etd-01312007-152347/unrestricted/02chapter2.pdf hope it is useful