Digital line graphs from 1:100,000-scale maps
Data Users Guide
2
By: Water Resources Division, U.S. Geological Survey
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Abstract
The National Cartographic Information Center (NCIC) distributes digital cartographic/geographic data files produced by the U.S. Geological Survey (USGS) as part of the National Mapping Program. Digital cartographic data files may be grouped into four basic types. The first of these, called a Digital Line Graph (DLG), is line map information in digital form. These data files include information on planimetric base categories, such as transportation, hydrography, and boundaries. The second form, called a Digital Elevation Model (OEM), consists of a sampled array of elevations for ground positions that are usually, but not always, at regularly spaced intervals. The third type is Land Use and Land Cover digital data, which provides information on nine major classes of land use such as urban, agricultural, or forest as well as associated map data such as political units and Federal land ownership. The fourth type, the Geographic Names Information System, provides primary information for known places, features, and areas in the United States identified by a proper name.
Suggested Citation
Water Resources Division, U.S. Geological Survey, 1989, Digital line graphs from 1:100,000-scale maps: U.S. Geological Survey Data Users Guide 2, 92 p., https://doi.org/10.3133/70046345.
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Digital line graphs from 1:100,000-scale maps |
| Series title | Data Users Guide |
| Series number | 2 |
| DOI | 10.3133/70046345 |
| Year Published | 1989 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 92 p. |
| Country | United States |