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Geographic Information Systems (GIS): [GIS dictionary] GIS is a computer-based tool that analyzes, stores, manipulates and visualizes geographic information on a map. GIS links geographic locations on Earth with attribute information enabling users to visualize patterns, understand relationships and trends.
Projection is referred as Coordinate Reference System (CRS) or Spatial Reference System (SRS) within QGIS. Coordinate systems are categorized in 2 types: Geographic Coordinate Systems and Projected Coordinate Systems. Geographic Coordinate Systems use Latitude and Longitude as coordinates and use different ellipsoids.