• Traditional representations in computers
  • every possible map into one
  • endless possibilities
    
    
• Layers
  • collection of similar geographic objects
  • what's needed for map or analysis
    
    
• Contains Features
  • individual objects
    • each city, each river, each school
    • information by clicking
      
  • variety of shapes and surfaces
    • points, lines, polygon
      
  
  
• Locations
  • coordinate systems
  • georeferenced images
    
    
• Scale & Projections
  • zoom in or out
  • matches almost any map
    
    
• Linked to Attributes
  • features linked to information
    • usually in attribute tables
    • relational databases, Geodatabases, CAD files...
    • dynamic with changes
  • useful for queries and analysis
    
    
• Spatial Analysis
  • understand spatial relationships among features
    • proximity, adjacency, overlays
    • create new maps
      
      

Index