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Geographic Information Systems
cover (figs. 3 and 4). Likewise, census or hydrologic tabular data can be converted to a maplike form and serve as layers of thematic information in a GIS (figs. 5 and 6). Figure 1a. U.S. Geological Survey (USGS) digital line graph (DLG) data of roads. Figure 1b. USGS DLG of rivers....
erg.usgs.gov/isb/pubs/gis_poster/
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