Calculating the distance between 2 points in c#

Question

I am trying to sort out a method to calculate the distance between 2 points in c#.

This is the code I have been trying though I fear the answer I get is not correct.

Answer 1

The class I usually use is GeoCoordinate

double latA = -31.997976f;
double longA = 115.762877f;
double latB = -31.99212f;
double longB = 115.763228f;

var locA = new GeoCoordinate(latA, longA);
var locB = new GeoCoordinate(latB, longB);
double distance = locA.GetDistanceTo(locB ); // metres

Answer 2

You can use DbGeography for spatial calculation. It has DbGeography.Distance method which is used to calculate the distance between two gps points.

Otherwise, try Ref: Harversine Formula to calculate the distance between two points.

Answer 3

double lat1 = {};
double lat2 = {};
double lon1 = {};
double lon2 = {};

var R = 6376.5000; //Km
lat1 = lat1.ToRad();
lat2 = lat2.ToRad();
lon1 = lon1.ToRad();
lon2 = lon2.ToRad();
var dLat = lat2 - lat1;
var dLon = lon2 - lon1;
var a = Math.Pow(Math.Sin(dLat / 2), 2) + (Math.Pow(Math.Sin(dLon / 2), 2) * Math.Cos(lat1) * Math.Cos(lat2));
var c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
var distance = R * c;

public double ToRad(this double degs) {
    return degs * (Math.PI/180.0);
}

Input expects doubles.

This is the haversine formula, it's used to calculate the distances on our globe between two points. This is the distance in a straight line, if you need the distance on a path you will have to find all points on that path and then calculate the distances between each two points and then take the sum of that.

Answer 4

Distance Formula: Given the two points (x1, y1) and (x2, y2), the distance between these points is given by the formula:

use it accordingly