What is difference between wgs84 and nad83

I would not be sure about the accuracy of Google Earth aerial photos if it is down to 2. It might just be a question of not exactly orthogonal photography. Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Converting between wgs84 and nad83 Ask Question.

Asked 6 years, 9 months ago. Active 6 years, 5 months ago. Viewed 25k times. Improve this question. John Robertson John Robertson 1 1 gold badge 2 2 silver badges 7 7 bronze badges. Have you applied a transformation? See blogs. I find that Google Earth can be off by several meters. When I flip between years in the historical images, the buildings shift in position, which leads me to think it isn't very accurate. Add a comment. Active Oldest Votes.

Datums are used to match the location of features and locations on a map. Different datums have been used in different times — each of them changing as per the view of the Earth. The World Geodetic System of and the North American datums were considered the same from to Both these datums were based on similar Doppler reference frames. NAD83 can also be termed as the horizontal control datum that is used for the U.

A new datum, the NAD83 is based on an adjustment of , points which includes Satellite Doppler stations.

WGS84 is used by the U. Department of Defense. This WGS84 datum came into force in that used the technique of Doppler satellite surveying. The World Geodetic System of datum has shifted meters from the earlier used prime meridian. But The North American datum has not shifted from its earlier location. NAD83 has been updated by the geodesists in the year Impediment of the first acknowledgment of NAD83 was that admittance to it was given chiefly through a flat control organization.

GPS satellites that transmitted the radio waves make calculations of the Earth on continents and oceans very accurately.

Due to the upgrading processing abilities and the GPS technology, Worldwide ellipsoid models have been made. North America Datum rectifies some of the twists from North America Data over distance with the help of utilizing more effective positioning from terrene and Doppler satellite information.

North America Datum is a geocentric source offset by around 2 meters. Yes, even today, geodesists are tirelessly working on the level of geodetic sources. Skip to content As our Earth is followed by norms and conditions of geographic information systems we maintain level guide projections, we need to bind with the level of perspectives on the world.