Keyword Analysis & Research: wgs84 and nad83

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Frequently Asked Questions

What is the difference between NAD83 and WGS84 datum?

Thanks for any clarification. Answer: There are a number of difference between the NAD83 and the WGS84 datum. One is the reference ellipsoid. The North American 1983 datum (NAD83) uses the Geodetic Reference System (GRS80) ellipsoid while the World Geodetic System of 1984 (WGS84) uses the WGS 84 ellipsoid.

What is the difference between AD83 and WGS84?

The North American 1983 datum (NAD83) uses the Geodetic Reference System (GRS80) ellipsoid while the World Geodetic System of 1984 (WGS84) uses the WGS 84 ellipsoid. The dimensions of these ellipsoids differ slightly. For more information, refer to Projection basics the GIS professional needs to know.

Is NAD83 geocentric?

However, NAD83 is not geocentric with an offset of about two meters. North American Datum of 1983 is based on the reference ellipsoid GRS80 which is physically larger than NAD27’s Clarke ellipsoid. The GRS80 reference ellipsoid has a semi-major axis of 6,378,137.0 meters and a semi-minor axis of 6,356,752.3 meters.

What is the difference between itrf08 itritrf00 WGS84 and NAD83?

ITRF00, WGS84 and NAD83. NAD83 and WGS84, originally differed by only a centimeter or two. That is no longer true. In their new definitions—NAD83 (2011) and WGS84 (G1762)—differ up to one or two meters within the continental United States. On the other hand ITRF08 and WGS84 (G1762) are virtually identical.


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