Digital Chart of the World
Encyclopedia
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.
The thematic layers of the Digital Chart of the World are:
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, pipelinePipeline transportPipeline transport is the transportation of goods through a pipe. Most commonly, liquids and gases are sent, but pneumatic tubes that transport solid capsules using compressed air are also used....
s) - Drainage system
- Hypsographic data
- Land cover
- Ocean features
- Physiography
- Cultural landmarks
- Transportation structure
- Vegetation
- Data location
See also
- Vector mapVector MapThe Vector Map , also called Vector Smart Map, is a vector-based collection of Geographic information system data about Earth at various levels of detail. Level 0 coverage is global and entirely in the public domain...
(VMAP0 and VMAP1 data) - Digital elevation modelDigital elevation modelA digital elevation model is a digital model or 3-D representation of a terrain's surface — commonly for a planet , moon, or asteroid — created from terrain elevation data....
- Digital terrain model