Latest Earthquakes Chat Share. Topographic maps became a signature product of the USGS because the public found them - then and now - to be a critical and versatile tool for viewing the nation's vast landscape. The USGS was entrusted with the responsibility for mapping the country in and has been the primary civilian mapping agency of the United States ever since.
The best known USGS maps are the ,scale topographic maps, also known as 7. From approximately to , more than 55, 7. Similar maps at varying scales were produced during the same time period for Alaska, Hawaii, and US Territories. The 7. Map revision continued, though in decreasing quantities, through the s.
The last printed USGS topographic maps were published in In , a new USGS quadrangle topographic map series was defined. At about the same time, a separate project was started to scan the entire historic library of traditional topographic maps.
US Topo is the current topographic map series. These are modeled on the legacy 7. In addition to topographic quadrangles, the USGS publishes many other kinds of geospatial data and imagery.
For further information, see The National Map home page. Science Explorer. Field surveyors have years of experience in the selection of AGM locations that are the most suitable for the type of inspection being employed. EDGE has industry leading proprietary software that facilitates the collection of a wide range of data for every AGM location.
The data collection procedure and software have several redundancy features that allow quality control of the data to eliminate field errors. Park Passes. News Releases. Featured Stories. Science Snippets. Technical Announcements. Employees in the News. Get Our News. Media Contacts.
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