1:4M-scale Topographic Database of the National Fundamental Geographic Information System of China:


   The 1:4M-scale Topographic Database of the National Fundamental Geographic Information System of China(1:4M DB) is derived from the 1:1M-scale Topographic Database of the National Fundamental Geographic Information System of China. The contents of the 1:4M DB are: main rivers (level 5 and above), main roads, railways,cities (county and above), boundaries (county boundary and above) and so on. The data are divided into 6 layers.
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  • Standards and Specifications
  • Metadata
  • Service
  • Documents