Difference Between NAD 27 and NAD 83

North American Datum 27 (NAD 27) is based on Clarke Ellipsoid of 1866 which is calculated by manual surveying of the content, whereas NAD 83 is based on the Geodetic Reference System (GRS) of 1980. GRS 1980 is the approximate measurement of the whole earth.

1. What does NAD 83 stand for?
2. Are WGS84 and NAD83 the same?
3. Why is it important to determine whether the NAD27 or NAD83 version of SPCS is used to map an area?
4. Does Google Maps use NAD27 or NAD83?
5. Does Google Earth use NAD83?
6. What is navd88 based on?
7. Is NAD 1983 a projected coordinate system?
8. What horizontal datum does Google Earth use?
9. What is the difference between WGS and UTM?
10. What SPCS zones?
11. How are SPCS zones determined?
12. What is the most commonly used datum plane?

What does NAD 83 stand for?

The North American Datum of 1983 (NAD 83) is the horizontal and geometric control datum for the United States, Canada, Mexico, and Central America. NAD 83 was released in 1986. State-by-state adjustments were completed in the 1990s, an effort referred to as the High Accuracy Reference Network (HARN).

Are WGS84 and NAD83 the same?

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.

Why is it important to determine whether the NAD27 or NAD83 version of SPCS is used to map an area?

Why is it important to determine whether the NAD27 or NAD83 version of SPCS is used to map an area? There may be different values for each zone's origin.

Does Google Maps use NAD27 or NAD83?

For FM and LPFM radio stations, the FCC uses an older coordinate system called NAD27 whereas most coordinates including Google Maps coordinates, use the newer NAD83 system.

Does Google Earth use NAD83?

NADCON for Google Earth (NADGE)

Both NAD83-to-NAD27 and NAD27-to-NAD83 coordinate conversions are supported. Position the point of interest (POI) in the center of the view.

What is navd88 based on?

The North American Vertical Datum of 1988 (NAVD 88) is the vertical datum for orthometric heights established for vertical control surveying in the United States of America based upon the General Adjustment of the North American Datum of 1988.

Is NAD 1983 a projected coordinate system?

UTM NAD83 is a projected coordinate system that represents physical locations abstracted to a flat, cartesian coordinate system. The UTM NAD83 projection uses the GRS80 ellipsoid and a center-of-the-earth anchor point as its datum, both of which are slightly different than the WGS datum.

What horizontal datum does Google Earth use?

Google Maps and Microsoft Virtual Earth use a Mercator projection based on the World Geodetic System (WGS) 1984 geographic coordinate system (datum). This Mercator projection supports spheres only, unlike the ESRI Mercator implementation, which supports spheres and ellipsoids.

What is the difference between WGS and UTM?

The difference is that WGS 84 is a geographic coordinate system, and UTM is a projected coordinate system. Geographic coordinate systems are based on a spheroid and utilize angular units (degrees).

What SPCS zones?

The State Plane Coordinate System (SPCS) is a set of 124 geographic zones or coordinate systems designed for specific regions of the United States. Each state contains one or more state plane zones, the boundaries of which usually follow county lines.

How are SPCS zones determined?

A Cartesian coordinate system is created for each zone by establishing an origin some distance (usually 2,000,000 feet) to the west of the zone's central meridian and some distance to the south of the zone's southernmost point. This ensures that all coordinates within the zone will be positive.

What is the most commonly used datum plane?

The most common reference Datums in use in North America are NAD27, NAD83, and WGS 84.