These maps are modeled on the familiar 7.5-minute quadrangle maps of the period 1947-1992, but are mass-produced from national GIS databases on a repeating cycle. The project was launched in late 2009, and the term “US Topo” refers specifically to quadrangle topographic maps published in 2009 and later. US Topo topographic maps are produced by the National Geospatial Program of the U.S. Building on the success of more than 130 years of USGS topographic mapping, the US Topo series is a new generation of maps of the American landscape.
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