North American Datum

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HandWiki. North American Datum. Encyclopedia. Available online: https://encyclopedia.pub/entry/30460 (accessed on 26 September 2026).

HandWiki. North American Datum. Encyclopedia. Available at: https://encyclopedia.pub/entry/30460. Accessed September 26, 2026.

HandWiki. "North American Datum" Encyclopedia, https://encyclopedia.pub/entry/30460 (accessed September 26, 2026).

HandWiki. (2022, October 20). North American Datum. In Encyclopedia. https://encyclopedia.pub/entry/30460

HandWiki. "North American Datum." Encyclopedia. Web. 20 October, 2022.

North American Datum

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The content is sourced from: https://handwiki.org/wiki/North_American_Datum

The North American Datum (NAD) is the horizontal datum now used to define the geodetic network in North America. A datum is a formal description of the shape of the Earth along with an "anchor" point for the coordinate system. In surveying, cartography, and land-use planning, two North American Datums are in use for making lateral or "horizontal" measurements: the North American Datum of 1927 (NAD 27) and the North American Datum of 1983 (NAD 83). Both are geodetic reference systems based on slightly different assumptions and measurements. Vertical measurements, based on distances above or below Mean High Water (MHW), are calculated using the North American Vertical Datum of 1988 (NAVD 88). NAD 83, along with NAVD 88, is set to be replaced with a new GPS- and gravimetric geoid model-based geometric reference frame and geopotential datum in 2022.

geodetic network lateral land-use

References

Shalowitz, USC&GS Field Engineers Bulletin, December 1938
Craig, Cindy (October 2013) "Where Theory Meets Practice: United States Standard Datum" Professional Surveyor Magazine Frederick, Maryland http://archives.profsurv.com/magazine/article.aspx?i=71429
US Coast & Geodetic Survey, "Triangulation in Kansas", Special Publication No. 70 (1921) ftp://ftp.library.noaa.gov/docs.lib/htdocs/rescue/cgs_specpubs/QB275U35no701921.pdf
Bulletin of the National Research Council, Issues 77-80, p. 230
Van Zandt, Boundaries of the United States and the several states, p. 265
Walter H. Schoewe, "Kansas and the geodetic datum of North America", Transactions of the Kansas Academy of Science 51 (1948) 117–124, www.jstor.org https://www.jstor.org/stable/pdfplus/3625750.pdf
NGS data http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=kg0640
Waldo http://www.ngs.noaa.gov/cgi-bin/ds_mark.prl?PidBox=kg0648
Cardarelli, Francois Encydopaedia of scientific units, weights, and measures: their SI equivalences and origins, Springer-Verlag London Limited 2003, ISBN:1-85233-682-X, p. 5, table 2.1, data from Giacomo, P., Du platine a la lumiere, Bull. Bur. Nat. Metrologie, 102 (1995) 5–14.
NOAA's NAD 27 vs. NAD 83 converter http://www.ngs.noaa.gov/cgi-bin/nadcon.prl
New Datums: Replacing NAVD 88 and NAD 83 https://www.ngs.noaa.gov/datums/newdatums/index.shtml

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