United States Geological Survey, Federal science agency in Reston, United States
The United States Geological Survey is a federal science agency in Reston that focuses on studying the natural resources of the United States. Its work covers the collection and analysis of information about water sources, mineral deposits, earthquakes, and landscape changes across the country.
Congress established this agency in 1879 to survey the geology and mineral resources of public lands in the western territories. Over time its responsibilities grew to include monitoring natural hazards and mapping the entire country.
The USGS maintains an extensive collection of maps, photographs, and scientific data that document the physical features of the United States.
Most scientific reports and maps are freely available online and provide information on geological formations, water quality, and seismic activity. Those looking for specialized data or tools for fieldwork can find guidance and contact points on the website.
More than one million historical aerial photographs dating back to the 1940s document the changing shape of the American landscape and allow comparisons with current satellite images. This collection shows the transformation of cities, river courses, and vegetation over several decades.
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