A digital line graph (DLG) is a cartographic map feature represented in digital vector form that is distributed by the U.S. Geological survey (USGS). DLGs are collected from USGS maps and are then distributed in various scales, and can have up to nine different categories of features depending on the chosen scale. This DLG example shows a section of Ottawa, Canada transformed into a digital vector form. This type of graph can be put into a GIS and used to maintain databases of relevant information.
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