## Which 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.

## Is Google Earth in NAD83 or NAD27?

Step 3: Google Earth’s Datum is WGS-84, not NAD-27.

**What datum is Google Maps?**

### What are XY coordinates on a map?

Coordinates are pairs (X, Y) in a two-dimensional space referenced to a horizontal datum. Whereas triplets (X, Y, Z) of points not only has a position but also has height referenced to a vertical datum. In other words, the X- and Y-values represent a horizontal position.

### How do I convert from NAD27 to NAD83?

1. Conversions between NAD27 and NAD83. This converts between NAD27 and NAD83 (1986) using the NADCON transformation. Newer realizations of NAD83, such as NAD83 (CORS96) and NAD83 (2011) can differ from NAD83 (1986) by a meter or so. This conversion uses the Esri transformation NAD_1927_To_NAD_1983_NADCON.

**How does the FCC convert licensing data to NAD83 coordinates?**

The FCC uses the procedures outlined below when converting licensing data to NAD83 coordinates when a radio service is converted to the Universal Licensing System (ULS). In most cases, this procedure uses the NADCON software developed by the National Geological Survey.

#### What is the difference between NAD83 and WGS84?

NAD83(1986) is the original realization of NAD83, which is practically identical to the original WGS84. The difference between the current realization of WGS84 used by GPS and the original realization of WGS84 typically is on the order of 1 meter.

#### When did the Federal geodetic control committee adopt NAD83?

In 1990, the Federal Geodetic Control Committee adopted the method employed by the NADCON software as the federal standard for the conversion to NAD83. See Notice to Adopt Standard Method for Mathematical Horizontal Datum Transformation, 55 Fed. Reg. 32681-01.