HOME ENV510 Landscape Ecology and GIS

Definitions & descriptions | Concepts & issues | Setting up GIS | Using GIS | Applications
Representation | Concept models | Data models | Spatial data | Referencing | Data issues | Accuracy | Error | Management

Spatial representation

Real world objects can be represented in the GIS as points, lines, areas and surfaces.

• Points (eg. trees, houses, road intersections)
  
  
• Lines are one dimensional ( eg. roads, rivers, regional boundaries, fences )
  
  
• Areas are two-dimensional ( eg. administrative regions, land cover types, geological regions)
  
  
• Surfaces are three dimensional ( eg. hills, valleys)
  

Objects are represented within conceptual models and translated into a computer format using data models.

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