GISuser Guide to downloading Free USGS 1:100K DLGs
Written by GISuser
26 February 2004
Digital Line Graphs (DLGs) are digital vector representations of cartographic information derived from USGS maps and related sources. Intermediate-scale DLG's are derived from USGS 1:100,000-scale 30- by 60- minute quadrangle maps.
If these maps are not available, Bureau of Land Management planimetric maps at 1:100,000 scale are used, followed by archival compilation materials. Depending on scale, the following layers may be available:
Public Land Survey System (PLSS) - Township, range, and section lines
Boundaries - State, county, city, and other national and State lands such as forests and parks
Transportation - Roads and trails, railroads, pipelines and transmission lines
Hydrography - Flowing water, standing water, and wetlands
Hypsography - Contours and supplementary spot elevations
Non-vegetative features - Glacial moraine, lava, sand, and gravel
Survey control and markers - Horizontal and vertical monuments (third order or better)
Manmade features - Cultural features, such as building, not collected in other data categories
Vegetative surface cover
1:100,000-scale DLGs are derived from USGS 30- by 60-minute quadrangle maps and are referenced to either NAD27 or NAD83.
To access and download 1:100K USGS DLG data, please select a State on the map below.
Note: The image used to create this map was provided by the USGS
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Digital Line Graphs (DLGs) are digital vector representations of cartographic information derived from USGS maps and related sources. Intermediate-scale DLG's are derived from USGS 1:100,000-scale 30- by 60- minute quadrangle maps.
If these maps are not available, Bureau of Land Management planimetric maps at 1:100,000 scale are used, followed by archival compilation materials. Depending on scale, the following layers may be available:
