GeoDesign Knowledge Portal

US Geological Survey Digital Line Graphs

The Digital Line Graphs (DLGs) are essentially the lines you see on the USGS topographic maps. The digital data is available at both 1:24,000 and 1:100,000 scales. The files include:
Public Land Survey System (PLSS) lines,
State, county, city, and other national and State lands such as forests and parks,
Roads and trails, railroads, pipelines, and transmission lines,
Flowing water, standing water, and wetlands
Contours and supplementary spot elevations
Glacial moraine, lava, sand, and gravel
Horizontal and vertical monuments (third order or better)
Cultural features, such as buildings, not collected in other data categories
Vegetative surface cover

Graphical Ontology Browser

  • Click on a node to jump to the content of that node
  • Pan to see the rest of the graph
  • Scroll the mousewheel up and down to zoom in and out
  • Rearrange the nodes in the graph by dragging a node to a different position


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