public double distance(locationModel cityLocation)
{
double latDiff = 69.2 * (this.lat - cityLocation.lat);
double lngDiff = lngMiles(this.lng, this.lat) - lngMiles(cityLocation.lng, cityLocation.lat);
double squared = Math.Pow(latDiff, 2) + Math.Pow(lngDiff, 2);
double distance = Math.Sqrt(squared);
return(distance);
}
//https://www.geeksforgeeks.org/haversine-formula-to-find-distance-between-two-points-on-a-sphere/
public double haversine(locationModel city)
{
double lat1 = this.lat;
double lon1 = this.lng;
double lat2 = city.lat;
double lon2 = city.lng;
// distance between latitudes and longitudes
double dLat = (Math.PI / 180) * (lat2 - lat1);
double dLon = (Math.PI / 180) * (lon2 - lon1);
// convert to radians
lat1 = (Math.PI / 180) * (lat1);
lat2 = (Math.PI / 180) * (lat2);
// apply formulae
double a = Math.Pow(Math.Sin(dLat / 2), 2) +
Math.Pow(Math.Sin(dLon / 2), 2) *
Math.Cos(lat1) * Math.Cos(lat2);
double rad = 3958.8;
double c = 2 * Math.Asin(Math.Sqrt(a));
return(rad * c);
}
