Abstract
The U.S. Geological Survey formed a Digital Applications Team in 1977 and started development of a Digital Cartographic Applications Program. The objectives are to produce, manage, and distribute cartographic data in computer compatible form. The principal types of data are similar in content and accuracy to the categories found on the standard 1:24,000-scale 7.5-minute topographic maps. Activity is also underway to produce a national small-scale data base at 1:2,000,000 scale. The data is organized into a Digital Elevation Model (DEM) data base and a Digital Line Graph (DLG) data base and standard file formats and attribute codes have been developed. The data will become of major importance for map preparation and revision and will allow the development of geographic information systems.
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