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  • 1 Geographical Cognition of the Real World
  • 2 Bit world
  • 3 The abstraction of the real world
  • 1 Metadata of spatial data
  • 2 Measurement scale of data
  • 3 GIS data quality
  • 4 Data meaning and data type
  • 1 Map digitization
  • 2 Processing of spatial data entry