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3 days ago · The U.S. Geological Survey (USGS) maintains a database of historical shoreline positions for the United States coasts derived from historical sources, such as aerial photographs or topographic surveys, and contemporary sources, such as modern orthophotography, light detection and ranging (lidar) point clouds, and digital elevation models.
2 days ago · Geography Map of the boundary stones. The District of Columbia (initially, the Territory of Columbia) was originally specified to be a square 100 square miles (260 km 2) in area, with the axes between the corners of the square running north-south and east-west, The square had its southern corner at the southern tip of Jones Point in Alexandria, Virginia, at the confluence of the Potomac River ...
6 days ago · GeMS is intended to provide a stepping stone toward development of multimap databases, in particular the National Geologic Map Database (NGMDB). Please visit our GeMS site. Related, Older Database Designs. This list focuses on the work by USGS and AASG staff, ca. 1998-2010, to define conceptual data models and physical implementations, mostly ...
3 days ago · A zipped folder ‘GroundwaterDepletion.zip’ provides groundwater depletion information by county, crop, and year. The time period is from 2008 to 2020. Irrigation volumes are given in units of ...
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4 days ago · Volcano Hazards Program. There are about 170 potentially active volcanoes in the U.S. The mission of the USGS Volcano Hazards Program is to enhance public safety and minimize social and economic disruption from volcanic unrest and eruption through our National Volcano Early Warning System.
1 day ago · In May 2001, the U.S. Geological Survey, Yellowstone National Park, and the University of Utah created the Yellowstone Volcano Observatory (YVO), a partnership for long-term monitoring of the geological processes of the Yellowstone Plateau volcanic field, for disseminating information concerning the potential hazards of this geologically active ...
4 days ago · They include all United States Geological Survey topographic maps at scales of 1:62,500 and 1:24,000 except for California; WWII-era Army Map Service maps; and series produced by national mapping agencies from numerous countries throughout the world.
