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Geographical Data Sets


Vectors & Raster Data Models - Merits & Demerits.

RASTER MODEL VECTOR MODEL
Advantages
  • Simple data structure
  • Easy and efficient overlaying
  • Compatible with RS imagery
  • High spatial variability is efficiently represented
  • Simple for own programming
  • Same grid cells for several attributes 
Disadvantages
  • Inefficient use of computer storage
  • Errors in perimeter, and shape
  • Difficult network analysis
  • Inefficient projection transformations
  • Loss of information when using large cells Less accurate (although interactive) maps
Advantages
  • Compact data structure
  • Efficient for network analysis
  • Efficient projection transformation
  • Accurate map output.
Disadvantages
  • Complex data structure
  • Difficult overlay operations
  • High spatial variability is inefficiently represented
  • Not compatible with RS imagery


Hybrid System
It is an integration of the best of Vector and Raster Models. The GIS technology is fast moving towards Hybrid model GIS.

The Integration of Vector and Raster System Hybird System


Figure 8: The Integration of Vector and Raster System Hybird System

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