世界土壌マップ

• Global Soil Regions Map (Natural Resources Conservation Service U.S. Department of Agriculture)
  http://soils.usda.gov/use/worldsoils/mapindex/order.html
  
  - Free, downloadable; a 2 minute grid cell resolutions; Production Date: April, 1997 Revised: September, 2005. Geographic Coverage: Global; Minimum Scale: 1:5,000,000.
  
  
• World soil information (国際土壌照会情報センター; International Soil Reference and Information Centre)
  
  http://www.isric.org/NR/exeres/545B0669-6743-402B-B79A-DBF57E9FA67F.htm
  
  
• Digital Soil Map of the World and Derived Soil Properties
  The Land and Water Development Division, FAO (国連食糧農業機関)
  
  >http://www.fao.org/AG/AGL/agll/dsmw.stm