GISuser Guide to downloading Free USGS 1:100K DLGs
Written by GISuser
Thursday, 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
See more threads and details about Glenn's AnyGeo Weblog HERE The Editor (Glenn) started the AnyGeo blog some time ago and the threads are now also mirrored here at GISuser.com - RSS feed is available to add to your favorite news reader.
Featured Events
GITA 17th Annual GIS for Oil & Gas Conference and Exhibition, set for Sept. 21-24, 2008 - The conference is the only event of its kind, devoted exclusively to geospatial applications and technologies for all aspects of the oil and gas industry.
GeoInt 2008 - Join us for the 5-year anniversary of the GEOINT SYMPOSIUM October 27-30 in Nashville, Tenn., where you'll have an unparalleled opportunity to learn, network and discover as we discuss the importance of being Mission Focused while Transitioning to the Future.
ASPRS Potomac Region GeoTech Conference - Geotech 2008 theme of "Emerging Geospatial Technologies and Applications." Technical session topics will include new data acquisition, distribution, and application technologies, each featuring presentations by well-known experts. 7&8 October in Silver Spring, MD
GITA's First Annual GIS for Oil & Gas Conference - The GIS for Oil & Gas Calgary Conference will build on the momentum from GITA’s GIS for Oil & Gas Conference held in Houston, Texas, every September. Nov. 6-7, 2008, Calgary Marriott Hotel, Calgary, Alberta, Canada
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:
See more threads and details about 
Get GISuser news & updates via RSS
