coordinateDistance static method
count distance beetween 2 coordinate in km (kilometer)
Implementation
static double coordinateDistance(lat1, lon1, lat2, lon2) {
var p = 0.017453292519943295;
var a = 0.5 -
cos((lat2 - lat1) * p) / 2 +
cos(lat1 * p) * cos(lat2 * p) * (1 - cos((lon2 - lon1) * p)) / 2;
return 12742 * asin(sqrt(a));
}