Topographic Maps, Mid-Continent Mapping Center, Geography Division, U.S. Geological Survey, U.S. Department of the Interior
Data Center Description
The National Mapping Program of the U.S. Geological Survey (USGS) is the descendent of the Corps of Topographical Engineers, formed in 1838. The USGS took over responsibility for mapping the country in 1879 and has been the primary civilian mapping agency of the United States ever since.
The most common and used USGS maps are the 1:24,000-scale topographic maps, also known as 7.5-minute quadrangles. More than 55,000 7.5-minute maps were made to cover the 48 conterminous States. This is the only in detail map series that covers the entire area of the United States in a considerable amount of detail. The National Map provides public access to consistent, high quality, geospatial data and information from multiple partners to help inform decision making by resource managers and the public.