| Digital Chart Of The World |
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Information AboutDigital Chart Of The World |
| CATEGORIES ABOUT DIGITAL CHART OF THE WORLD | |
| geographic information systems | |
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ORIGIN OF THE DIGITAL CHART OF THE WORLD The primary source for this database is the , 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 database is divided into 2,094 tiles that represent 5-degree by 5-degree areas of the globe, although if the data set is obtained from the University of Pennsylvania the data is broken up by pre-1992 national boundaries, whilst NIMA distributes the data set in just 5 tiles. The data currency varies from place to place, ranging from the mid 1960s to the early 1990s. Digital Chart of the World thematic layers are:
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