https://www.e-education.psu.edu/natureofgeoinfo/c7_p7.html
A DLG (Digital Line Graph) is a digital vector data. Data about map features are stored in lines, points, and areas. DLGs contain a wide variety of information including: topograpy, hydrography, boundaries, roads, utility lines, etc. Above is a portion of three digital line graph layers for USGS Bushkill, PA quadrangle.
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