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TopoQuest is a free web mapping service built on open source software that provides internet-based topographic map for most of the United States.. The site is one of three internet services used by Wikipedia for providing topographic maps.
A topographic map series uses a common specification that includes the range of cartographic symbols employed, as well as a standard geodetic framework that defines the map projection, coordinate system, ellipsoid and geodetic datum. Official topographic maps also adopt a national grid referencing system.
The National Map Corps consists of volunteers who devote some of their time to provide cartographic information to the U.S. Geological Survey.The only requirements to participate are having access to the Internet and a current familiarity with the area being mapped. [6]
The United States remains virtually the only developed country in the world without a standardized civilian topographic map series in the standard 1:25,000 or 1:50,000 metric scales, making coordination difficult in border regions (the U.S. military does issue 1:50,000 scale topo maps of the continental United States, though only for use by ...
The logo of the United States Geological Survey (USGS) The Geographic Names Information System (GNIS) is a database of name and location information about more than two million physical and cultural features throughout the United States and its territories; the associated states of the Marshall Islands, Federated States of Micronesia, and Palau; and Antarctica.
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Records of select geological societies are also maintained in the collection, such as the Geological Society of Washington, which was founded by John Wesley Powell and other noted scientists after the Civil War. Of special note are many 19th century maps with topics such as American political boundaries, transportation, geology, and mining.
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