• Source: Digital Chart of the World

      • The Digital Chart of the World (DCW) is a comprehensive digital map of Earth. It is the most comprehensive geographical information system (GIS) global database that is freely available as of 2006, although it has not been updated since 1992.


      Origin


      The primary source for this database is the United States Defense Mapping Agency's (DMA) operational navigation chart (ONC) 1:1,000,000 scale paper map series produced by the US, Australia, Canada, and the United Kingdom. These charts were designed to meet the needs of pilots and air crews in medium-and low-altitude en route navigation and to support military operational planning, intelligence briefings, and other needs.


      Data structure


      The data is divided into 2,094 tiles that represent 5 × 5-degree areas of the globe, except data obtained from Penn State which is broken up by pre-1992 national boundaries, and data from the National Imagery and Mapping Agency (NIMA) which is broken into just five tiles. The data currency varies from place to place, ranging from the mid-1960s to the early 1990s.
      The thematic layers of the Digital Chart of the World are:

      Political/ocean (country boundaries)
      Populated places (urbanized areas and points)
      Roads
      Railroads
      Aeronautical structures
      Utilities (electrical, telephone, pipelines)
      Drainage system
      Hypsographic data
      Land cover
      Ocean features
      Physiography
      Cultural landmarks
      Transportation structure
      Vegetation
      Data location


      See also


      Vector map (VMAP0 and VMAP1 data)
      Digital elevation model
      Digital terrain model


      External links


      Digital Chart of the World specification (PDF)
      Digital Chart of the World Data Quality Project
      Digital Chart of the World (Countries) at WorldMap, Harvard University

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