US Topo quadrangles are digital topographic maps produced by the National Geospatial Program of the U.S. Geological Survey (USGS). Created in the familiar 7.5-minute quadrangle format like the legacy paper maps, US Topo maps support frequent updating, wide and fast public distribution, and basic, on-screen geographic analysis.
Users can turn US Topo data layers on and off as needed, zoom in and out to examine specific features or see a broader area, and print the maps in their entirety or in customized sections on a broad array of printing devices. Viewing and analytical tools are available for free download from Adobe and TerraGo Technologies. File size for each US Topo is about 15-20 megabytes.
US Topo maps are produced by the USGS National Geospatial Technical Operations Center. The first US Topo prototypes, "Digital Maps - Beta," were made in June 2009. A limited number of these maps were made spanning 18 states. As of October 2012, the prototype maps were replaced by US Topo maps and the "Digital Maps - Beta" prototype maps are no longer available. More information about US Topo maps can be found here.
Introduction to US Topo — a video The National Geospatial Program has released an informative and entertaining video to demonstrate the advantages, capabilities and opportunities provided by US Topo electronic maps. http://gallery.usgs.gov/videos/568
Current US Topo map coverage (click image for status)
US Topo three-year Work Plan (click image for larger version)
How US Topos Differ from Traditional USGS Topographic Maps
Made from nationally consistent data that are quality assured to high standards
Downloadable free from the USGS Store
Free downloadable user tools
Selectable reference systems:
UTM (Universal Transverse Mercator)
MGRS (Military Grid Reference System)
Interactive capabilities with Google Maps®
A planned 3-year revision cycle, facilitating incorporation of additional data layers