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The readjustment of the North American Datum of 1927 (NAD 27), Old Hawaiian Datum and Puerto Rico Datum to the North American Datum of 1983 (NAD 83 (1986)) in July 1986 was both a change in reference ellipsoid and a "clean up" of nearly 200 years of surveying data held by NGS. Based on this readjustment and...
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www.ngs.noaa.gov/TOOLS/Nadcon/Nadcon.html
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Frequently asked questions (FAQ) about the National Geodetic Survey ... The North American Datum of 1983 (NAD 83) is "The horizontal control datum for the United States, Canada, Mexico, and Central America, based on a geocentric origin and the Geodetic Reference System 1980.
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www.ngs.noaa.gov/faq.shtml
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North American Datum of 1927 (NAD27) is a datum based on the Clarke ellipsoid of 1866. The reference or base station is located at Meades Ranch in Kansas. There are over 50,000 surveying monuments throughout the US and these have served as starting points for more local surveying and mapping efforts.
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www.towermaps.com/nad.htm
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North American Datum - Topic:GIS - Online Encyclopedia ... 1 North American Datum of 1927 ; 2 North American Datum of 1983 ; 3 Comparisons Between NAD-27 and NAD-83 ; 4 External links ; 5 See also ...
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en.mimi.hu/gis/north_american_datum.html
en.mimi.hu/gis/north_american_datum.html
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There are two phases of the North American Datum - NAD27 and NAD83 - one local the other geocentric. Local datum align a spheroid to closely fit the earth's surface in a particular area.
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www.fgdl.org/tutorials/howto_reproject/Definitions.html
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Once the U.S. Standard Datum of 1901 had been established and perpetuated as the North American Datum, all subsequent triangulation work was fit into that network, and all closure errors were taken up by adjustments to the new work, leaving the stations of the 1901 datum unchanged.
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www.holoscenes.com/cgi-bin/moin.cgi/North_American_Datu...
www.holoscenes.com/cgi-bin/moin.cgi/North_American_Datum
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SUMMARY: The National Geodetic Survey (NGS) will publish North American Datum of 1983 (NAD 83) State Plane Coordinate (SPC) grid values in both meters and U.S. Survey Feet (1 ft = 1200/3937 m) in Kansas, for all well defined geodetic survey control monuments maintained by NGS in the National Spatial Reference System...
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www.scribd.com/doc/2794302/Notice-Coastal-zone-manageme...
www.scribd.com/doc/2794302/Notice-Coastal-zone-management-programs-and-estuarine-sanctuariesConsistency-appeals8212-Kansas-grid-data-National-Geodetic-Survey-North-Ameri
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FAQ Home > Geospatial Data > How large is the North American Datum (NAD) 27 to ... ... How large is the North American Datum (NAD) 27 to NAD 83 shift? ... Generally, for the conterminous United States, the North American Datum (NAD) shift amounts to about 210 meters. This shift occurs because of the change in shape of the...
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www.usgs.gov/faq/list_faq_by_category/get_answer.asp?id...
www.usgs.gov/faq/list_faq_by_category/get_answer.asp?id=378
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§ 102‑1.1. Name and description in relation to 1983 North American Datum. ... Whenever plane coordinates are used in the description or identification of surface area or location within this State, the coordinates shall be identified as "NAD 83", indicating North American Datum of 1983, or as "NAD 27",
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www.ncga.state.nc.us/EnactedLegislation/Statutes/HTML/B...
www.ncga.state.nc.us/EnactedLegislation/Statutes/HTML/BySection/Chapter_102/GS_102-1.1.html
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