| Digital Chart Of The World |
Article Index for Digital |
Website Links For Digital |
Information AboutDigital Chart Of The World |
| CATEGORIES ABOUT DIGITAL CHART OF THE WORLD | |
| geographic information systems | |
|
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 Penn State the data is broken up by pre-1992 national boundaries, whilst the National Imagery And Mapping Agency (NIMA) distributes the data set in just five 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:
SEE ALSO
EXTERNAL LINKS
|
|
|