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  2. 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.

  3. Libre Map Project - Wikipedia

    en.wikipedia.org/wiki/Libre_Map_Project

    The Libre Map Project was started by Jared Benedict and around 100 additional individuals contributing money to purchase (or "liberate") a full set of 1:24K scale USGS topographic maps in Digital raster graphic form. [1] The map files were then hosted by archive.org to ensure the map data will continue to be freely available to everyone ...

  4. United States National Grid - Wikipedia

    en.wikipedia.org/wiki/United_States_National_Grid

    In addition to providing a convenient means to identify and communicate specific locations (points and areas), an overlaid USNG grid also provides an orientation, and—because it is distance based—a scale of distance that is present across the map. USGS topographic maps have for decades been published with 1000-meter UTM tick marks in the ...

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

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

    Brass marker with the shapes of the three states is located in a monument box beneath the surface of a rural road. Was set in 1999 [20] and is referenced by a granite marker 20 feet to the east on the Michigan-Ohio line. [21] Iowa: Minnesota: South Dakota

  6. The National Map - Wikipedia

    en.wikipedia.org/wiki/The_National_Map

    The National Map is a significant contribution to the U.S. National Spatial Data Infrastructure (NSDI) from the Federal Geographic Data Committee (FGDC) and currently is being transformed to better serve the geospatial community by providing high quality, integrated geospatial data and improved products and services including new generation ...

  7. Survey marker - Wikipedia

    en.wikipedia.org/wiki/Survey_marker

    NGS Survey Data Explorer is an interactive map that will find markers in a selected location. Marker types identified. Marker links to data sheet. This website provides a state-by-state mapping of NGS survey marks on to Google Maps, enabling one to search for these marks visually. Description and history of the types of markers used in the ...

  8. United States Coast and Geodetic Survey - Wikipedia

    en.wikipedia.org/wiki/United_States_Coast_and...

    United States Coast and Geodetic Survey emblem from 1891 map Coast and Geodetic Survey headquarters—the Richards Building—in 1902, with the United States Capitol visible in the distance. On February 5, 1889, by a joint resolution of Congress, the U.S. government accepted an invitation by the government of the German Empire to become a party ...

  9. Digital raster graphic - Wikipedia

    en.wikipedia.org/wiki/Digital_raster_graphic

    Libre Map Project. All 50 States USGS Topographic Maps on the Internet Archive; USGS Topographic Maps of ALL 50 States; USGS Sites Digital Raster Graphics Archived 2005-05-21 at the Wayback Machine; Earth Explorer (GeoTIFFs) Map Locator (GeoPDFs) Kentucky Raster Graphics Image Download Center Archived 2006-09-25 at the Wayback Machine