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NADCON – a free utility for Microsoft Windows to convert between NAD 27 and NAD 83; nadcon.prl – a web-based utility for NADCON; NAD 83: What Is It and Why You Should Care by Dane E. Ericksen, P.E., Hammett & Edison, Inc., Consulting Engineers. 1994 SBE National Convention and World Media Expo. Archived 26 June 2011 at the Wayback Machine
Originally, the state plane coordinate systems were based on the North American Datum of 1927 (NAD27). Later, the more accurate North American Datum of 1983 (NAD83) became the standard (a geodetic datum is the way a coordinate system is linked to the physical Earth). More recently there has been an effort to increase the accuracy of the NAD83 ...
Magnitude of shift in position between NAD27 and NAD83 datum as a function of location. Grid-based transformations directly convert map coordinates from one (map-projection, geodetic datum) pair to map coordinates of another (map-projection, geodetic datum) pair.
North American Datum shift between NAD27 and NAD83. Coordinates returned by the NRIS may not always be spot on. In many cases, coordinates of NRHP listings were traced out on old U.S. Geological Survey quadrant maps which still followed the North American Datum of 1927. In 1983 there was a world-wide adjustment of all geographic coordinates, to ...
The National Transformation format has been developed by Natural Resources Canada's Geodetic Survey Division for conversions between NAD27 and NAD83 but it has been adapted to several other countries, such as Australia, Austria, [3] Belgium, [4] Brazil, Canada, France, Germany, New Zealand, Portugal, Romania, [5] South Africa, Spain, Switzerland, Venezuela [2] and the United Kingdom.
UTM Zone 17N NAD 27: Clarke 1866: NAD 27: cartesian (x,y) Transverse Mercator: central meridian 81°W, scaled 0.9996: 500 km west of (81°W, 0°N) equator, 81°W meridian: meter 6576: SPCS Tennessee Zone NAD 83 (2011) ftUS: GRS 80: NAD 83 (2011 epoch) cartesian (x,y) Lambert Conformal Conic: center 86°W, 34°20'N, standard parallels 35°15'N ...
Thus, there will be a significant difference between the coordinate of a location in "UTM NAD83 Zone 14N" and for the same location in "UTM NAD27 Zone 14N", even though the UTM formulas are identical, because the underlying latitude and longitude values are different.
The projection from spheroid to a UTM zone is some parameterization of the transverse Mercator projection. The parameters vary by nation or region or mapping system. Most zones in UTM span 6 degrees of longitude, and each has a designated central meridian. The scale factor at the central meridian is specified to be 0.9996 of true scale for most ...