sphericalLawOfCosinesDistance static method

double sphericalLawOfCosinesDistance(LatLng point1, LatLng point2)

Calculates the distance between two geographic points using the Spherical Law of Cosines formula and the Earth's radius.

The Spherical Law of Cosines formula provides a more accurate method for calculating distances between two points on the Earth's surface, taking into account the curvature of the Earth.

point1 - The first LatLng object representing the latitude and longitude coordinates of the first point.

point2 - The second LatLng object representing the latitude and longitude coordinates of the second point.

Returns the distance between the two points in kilometers, calculated using the Spherical Law of Cosines formula.

Implementation

static double sphericalLawOfCosinesDistance(LatLng point1, LatLng point2) {
  // Earth's radius in kilometers.
  final double radius = 6371.0;

  // Convert latitude and longitude values to radians.
  double lat1 = (point1.latitude).toRadians();
  double lon1 = (point1.longitude).toRadians();
  double lat2 = (point2.latitude).toRadians();
  double lon2 = (point2.longitude).toRadians();

  // Calculate the difference in longitude.
  double deltaLon = lon2 - lon1;

  // Calculate the distance using the Spherical Law of Cosines formula.
  double distance =
      acos(sin(lat1) * sin(lat2) + cos(lat1) * cos(lat2) * cos(deltaLon)) *
          radius;

  return distance;
}