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Learn about the different methods and locations of measuring the center of the U.S., including the contiguous and the 50 states. Find out the coordinates, markers, and cultural references of the geographic center of the U.S.
Find out the location and coordinates of the geographic center of each U.S. state and territory, as well as the contiguous 48 states and North America. The list is based on the method used by the U.S. Geological Survey in the early 1920s.
The web page lists the principal and guide meridians and base lines of the United States, with their longitudes, latitudes, and adoption dates. It does not contain any information about admissibly meridian, which is not a valid term or concept in surveying or geography.
The Public Land Survey System (PLSS) is the surveying method used in the United States to divide real property for sale and settling. It was created by the Land Ordinance of 1785 and covers most of the states west of Pennsylvania, except for some territories and states that use other systems.
Learn about the history and features of the North American Datum, a horizontal reference system for surveying and mapping in North America. Compare the differences between NAD 27 and NAD 83, the two datums in use, and their relation to the Clarke and GRS ellipsoids.
SPCS is a set of 125 geographic zones or coordinate systems for specific regions of the United States. It uses a simple Cartesian coordinate system to specify locations and is widely used for geographic data by state and local governments.
The contiguous United States are the 48 adjoining states and the District of Columbia of the U.S. in central North America. They exclude Alaska, Hawaii and other insular areas, and have a population of about 328 million.
Learn about the history, mission, and organization of the USGS, a federal agency that studies the Earth and its natural resources. Find out how the USGS conducts research, maps, monitors, and provides data on various topics such as earthquakes, volcanoes, water, and climate.
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