What is digital line graph (DLG) data?
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Question: What is digital line graph (DLG) data?

Answer:

Digital line graph (DLG) data are digital representations of cartographic information. DLG's of map features are digital vectors converted from maps and related sources. The U.S. Geological Survey (USGS) DLG data are classified as large, intermediate, and small scale.

Source of this FAQ:
http://mac.usgs.gov/isb/pubs/factsheets/fs07896t.html

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