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The Pennsylvania Geological Survey, or Bureau of Topographic and Geologic Survey (BTGS), is a geological survey enacted by the Pennsylvania General Assembly "to serve the citizens of Pennsylvania by collecting, preserving, and disseminating impartial information on the Commonwealth's geology, geologic resources, and topography in order to contribute to the understanding, wise use, and ...
The Public Land Survey System (PLSS) is the surveying method developed and used in the United States to plat, or divide, real property for sale and settling. Also known as the Rectangular Survey System, it was created by the Land Ordinance of 1785 to survey land ceded to the United States by the Treaty of Paris in 1783, following the end of the ...
Andrew Ellicott (January 24, 1754 – August 28, 1820) was an American land surveyor who helped map many of the territories west of the Appalachians, surveyed the boundaries of the District of Columbia, continued and completed Pierre (Peter) Charles L'Enfant's work on the plan for Washington, D.C., and served as a teacher in survey methods for Meriwether Lewis.
The survey is claimed to be the first major cadastral survey undertaken by any nation. The point now lies underwater on the state line between Ohio and Pennsylvania. Because it is submerged, a monument commemorating the point is adjacent to the nearest roadway and located on the state line between East Liverpool, Ohio and Ohioville, Pennsylvania.
The Public Land Survey System was not the first to define and implement a survey grid. A number of similar systems were established, often using terms like section and township but not necessarily in the same way. For example, the lands of the Holland Purchase in western New York were surveyed into a township grid before the PLSS was established.
The Depreciation Lands were a tract of land within a part of western Pennsylvania that was purchased by the Commonwealth from Native Americans in 1784. The area was located west of the Allegheny River, north of the Ohio River, and was bordered to the north by the east–west line that stretched from the mouth of Mahoning Creek (then known as Mogulbughtiton Creek) to the western border of ...
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Gaps and gores are portions of land areas that do not conform to boundaries found in cadastre and other land surveys based upon imprecise measurements and other ambiguities of metes and bounds. A gap, also known as a hiatus , occurs where the descriptions in deeds describing adjacent properties (unintentionally) overlook a space or "gap ...