Editing Geodetic datum (section)

==== World Geodetic System 1984 (WGS{{nbsp}}84) ====

The Global Positioning System (GPS) uses the World Geodetic System 1984 (WGS{{nbsp}}84) to determine the location of a point near the surface of Earth.

{| class="wikitable"
|+ WGS{{nbsp}}84 defining parameters
! Parameter
! Notation
! Value
|-
| Semi-major axis
| <math>a</math>
| {{val|6378137.0|u=m}}
|-
| Reciprocal of flattening
| <math>\frac{1}{f}</math>
| {{val|298.257223563}}
|}

{| class="wikitable"
|+ WGS{{nbsp}}84 derived geometric constants
! Constant
! Notation
! Value
|-
| Semi-minor axis
| <math>b</math>
| {{val|6356752.3142|u=m}}
|-
| First eccentricity squared
| <math>e^2</math>
| {{val|6.69437999014|e=−3}}
|-
| Second eccentricity squared
| <math>{e'}^2</math>
| {{val|6.73949674228|e=−3}}
|}