Chapter 4 (SCHUURMAN):

-Measurement and calculation of distance are the most simple and important function of GIS. As GIS gone through lots of changes overlay of large areas has become GIS common feature. Raster data is used to overlay maps/areas.

-Set theory is defined as the basis for analysis in information sciences including GIS. It uses spatial entities and areas as basis of GIS to formally express relationships.

-GIS helps to make decision for spatial locations. People use GIS map spatial data in graphical form. This help them visualize the geographical data.

-Population health can be understood by analyzing the spatial pattern and by allowing the attribute to express themselves.

-As GIS is used by governments too. Scanning passport and taking finger prints has helped them accumulate tons of digital data.

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