NewGeodesic creates a new instance of Geodesic with the given equatorial radius a (in meters) and flattening of the ellipsoid f.

NewPolygonArea creates a new instance of PolygonArea with the given Geodesic.

WGS84_a is the equatorial radius of the WGS84 ellipsoid (6378137 m).

WGS84_f is the flattening of the WGS84 ellipsoid (1/298.257223563).

WGS84 is an instance of Geodesic which represents the Earth according to the World Geodetic System.

Data describes the characteristics of a geodesic between point 1 (Lat1, Lon1) and point 2 (Lat2, Lon2).

Geodesic is a type representing geodesic calculations.

Gnomonic is a type representing calculations for gnomonic projections centered at an arbitrary position C on the ellipsoid.

GnomonicData describes the results of gnomonic projection.

Line represents a geodesic line and facilitates the determination of a series of points on a single geodesic.

PolygonArea is a type representing geodesic polygon area and perimeter calculations on an ellipsoid.

PolygonResult is a container struct for results from geodesic polygon perimeter/area calculations.