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  2. Section (United States land surveying) - Wikipedia

    en.wikipedia.org/wiki/Section_(United_States...

    The primary grid pattern is of quarter sections (1 ⁄ 2 mi × 1 ⁄ 2 mi (800 m × 800 m)). In U.S. land surveying under the Public Land Survey System (PLSS), a section is an area nominally one square mile (2.6 square kilometers), containing 640 acres (260 hectares), with 36 sections making up one survey township on a rectangular grid.

  3. Quadrangle (geography) - Wikipedia

    en.wikipedia.org/wiki/Quadrangle_(geography)

    These maps employ the 1927 North American Datum (NAD27); conversion or a change in settings is necessary when using a GPS which by default employ the WGS84 geodetic datum. Beginning in 2009, the USGS made available digital versions of 7.5 minute quadrangle maps based on GIS data that use the NAD83 datum, which is typically within one meter of ...

  4. Public Land Survey System - Wikipedia

    en.wikipedia.org/wiki/Public_Land_Survey_System

    For example, SW1/4 NW1/4 S13, T1SR20E refers to the southwest quarter of the northwest quarter of section 13 of Township 1 South Range 20 East (a 40-acre parcel). See further discussion below. Base Line : A parallel of latitude, referenced to and established from a designated initial point, upon which all rectangular surveys in a defined area ...

  5. The National Map - Wikipedia

    en.wikipedia.org/wiki/The_National_Map

    The USGS also utilizes data from The National Map Corps, which consists of volunteers who devote some of their time to provide cartographic information on structures. [ 4 ] The National Map is the official replacement for the USGS topographic map program .

  6. National Atlas of the United States - Wikipedia

    en.wikipedia.org/wiki/National_Atlas_of_the...

    The National Atlas data was taken down from the USGS website; however, the site indicates that printable maps are archived on The Internet Archive's Wayback Machine. The maps can be printed or downloaded, but not previewed. [7] The USGS has updated a handful of the Atlas datasets on its pages since the Atlas retired. [7]

  7. 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 ...

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  9. 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.