A DLG, Digital Line Graph, is digital vector data that represents cartographic information. This information can include but not limited to topography, hydrography, boundaries, roads, and utility lines. The data about the maps features are stored as lines, points and areas with the data being digital vector data. These maps have the ability to contain a wide variety of information depicting geographic data. This can be seen in the map above. It show a range of different data represented as different colored lines within the map or area being analyzed. I am almost certain that the yellow lines represent boundaries but the meaning of the other lines is unknown.
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