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