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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.
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 ...
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 WGS84, or within the uncertainty of most GPS coordinate measurements. The USGS also produces quarter quadrangle (QQ) maps of areas 3.75 minutes square. [3] [4] [5] The ...
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 .
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 ...
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.
In the Homestead Act of 1862, one quarter-section of land was the amount allocated to each settler. Stemming from that are the idiomatic expressions , "the lower 40", the 40 acres on a settler's land that is lowest in elevation, in the direction towards which water drains toward a stream, and the " back forty ", the portion farthest from the ...
LSDs can be "quarter-quarter sections" (square land parcels roughly 1 ⁄ 4 mi [400 m] on a side, comprising roughly 40 acres [160,000 m 2] in area)—but this is not necessary. Many are other fractions of a section (a half-quarter section—roughly 80 acres [320,000 m 2] in area is common). LSDs may be square, rectangular, and occasionally ...