Great Circle Distance
Plugin for calculating Great Circle Distance by Spherical Law of Cosines.
The great-circle distance, orthodromic distance, or spherical distance is the distance along a great circle. It is the shortest distance between two points on the surface of a sphere, measured along the surface of the sphere (as opposed to a straight line through the sphere's interior).
Usage
// The Geolocation of St.Mary Cathedral
final Geo geo1 = Geo(lat: 16.77858116672366, lon: 96.1657684686045);
// The Geolocation of St. Peter's Basilica
final Geo geo2 = Geo(lat: 41.90219864557144, lon: 12.454035933187363);
// The distance in km.
final double? theDistance = await GCD().cal(geo1: geo1, geo2: geo2);