A digital line graph is a digital vector
representations which are derived using information from topographic maps or
hypsographic data. The DLG maps can show topography, hydrography and utility
lines just to name a few.
The example map is of a Portion of three Digital Line Graph (DLG)
layers for USGS Bushkill, PA quadrangle; imaged with Global Mapper (dlgv32 Pro)
software. Transportation features are arbitrarily colored red, hydrography
blue, and hypsography brown. The square symbols are nodes and the triangles
represent polygon centroids.
Reference URL: https://www.e-education.psu.edu/natureofgeoinfo/c7_p7.html
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