Abstract The role of spatial data for decision making has increased the need for geographic information systems. This chapter starts by briefly describing the theory of geographic information systems. After that we present the interactions of geographic information systems with remote sensing and global navigation, positioning, and timing satellite systems. This is done with the idea to illustrate how geographic information systems (GISs), remote sensing, and global navigation satellite systems work together in order to generate final products. Then, we focus on the capability of GIS to analyze spatial data. We finally present examples of applications of GIS and current trends of research in the area. The examples presented through this chapter capture how GIS can be used for decision-making tasks in different areas of knowledge.


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