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  2. State Plane Coordinate System - Wikipedia

    en.wikipedia.org/wiki/State_Plane_Coordinate_System

    Thus the state plane coordinate system is still useful. Originally, the state plane coordinate systems were based on the North American Datum of 1927 (NAD27). Later, the more accurate North American Datum of 1983 (NAD83) became the standard (a geodetic datum is the way a coordinate system is linked to the physical Earth). More recently there ...

  3. List of principal and guide meridians and base lines of the ...

    en.wikipedia.org/wiki/List_of_principal_and...

    Primarily from the United States Government Printing Office Style Manual. [1] State names usually signify only parts of each listed state, unless otherwise indicated. Based on the BLM manual's 1973 publication date, and the reference to Clarke's Spheroid of 1866 in section 2-82, coordinates appear to be in the NAD27 datum.

  4. Module:Location map/data/USA Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Module:Location_map/data/...

    Map of Pennsylvania (click on map to see larger image) Module:Location map/data/USA Pennsylvania is a location map definition used to overlay markers and labels on an equirectangular projection map of the U.S. state of Pennsylvania. The markers are placed by latitude and longitude coordinates on the default map or a similar map image.

  5. United States National Grid - Wikipedia

    en.wikipedia.org/wiki/United_States_National_Grid

    In the first half of the 20th century, State Plane Coordinate Systems (SPCS) brought the simplicity and convenience of Cartesian coordinates to state-level areas, providing high accuracy (low distortion) survey-grade coordinates for use primarily by state and local governments. (Both of these planar systems remain in use today for specialized ...

  6. List of geographic centers of the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_geographic_centers...

    The exact geographic center of the U.S. Virgin Islands is unknown — the default center starting point for the U.S. Virgin Islands on Google Maps is located in the Caribbean Sea, [15] 18.21 miles (29.30 km) south-southeast of Saint Thomas and 18.31 miles (29.47 km) north of Saint Croix — note that this point is the approximate center of the ...

  7. List of cities in Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/List_of_cities_in_Pennsylvania

    Map of the United States with Pennsylvania highlighted. There are 56 municipalities classified as cities in the U.S. state of Pennsylvania. [1] Each city is further classified based on population, with Philadelphia being of the first class, Pittsburgh of the second class, Scranton of the second class A, and the remaining 53 cities being of the third class.

  8. List of tripoints of U.S. states - Wikipedia

    en.wikipedia.org/wiki/List_of_tripoints_of_U.S...

    This is a list of all tripoints in which the boundaries of three (and only three) U.S. states converge at a single geographic point. Of the 60 such points, 36 are on dry land and 24 are in water. [1]

  9. Geography of Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/Geography_of_Pennsylvania

    The Pennsylvania Dutch region in south-central Pennsylvania is a favorite for sightseers. The Pennsylvania Dutch, including the Amish, Mennonites, and at least 15 other sects are common in the rural areas around the cities of Lancaster, York, and Harrisburg with smaller populations extending northeast to the Lehigh Valley and up to the Susquehanna Valley.