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Frequently Asked Questions

What does NAD 83 stand for?

The United States National Spatial Reference System NAD 83(2011/MA11/PA11) epoch 2010.00, is a refinement of the NAD 83 datum using data from a network of very accurate GPS receivers at Continuously Operating Reference Stations (CORS).

What is the difference between NAD 83 and WGS 84?

In addition, NAD 83 is defined to remain constant over time for points on the North American Plate, whereas WGS 84 is defined with respect to the average of stations all over the world. Thus the two systems naturally diverge over time. For much of the United States the relative rate is on the order of 1 to 2 cm per year.

What is the replacement for nadnad 83?

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. In 1901 the United States Coast and Geodetic Survey adopted a national horizontal datum called the United States Standard Datum, based on the Clarke Ellipsoid of 1866.

Can I change the default UTM zone for NAD83?

You may change the default UTM zone. The change is processed interactively once a lat-long is converted; DO NOT click the Submit button. Mapping of NAD83 realizations to HARN and FBN


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