Calculate the distance between two places. - CSharp System

CSharp examples for System:Math Geometry

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Description

Calculate the distance between two places.

Demo Code


using System;//from w  w  w.j  a v  a2s . co  m
using System.Collections.Generic;
using System.Linq;
using System.Web;


    public class DistanceAlgorithm
    {
        const double PIx = 3.141592653589793;
        const double RADIUS = 6371.01;

        /// <summary>
        /// This class cannot be instantiated.
        /// </summary>
        private DistanceAlgorithm() { }

        /// <summary>
        /// Convert degrees to Radians
        /// </summary>
        /// <param name="x">Degrees</param>
        /// <returns>The equivalent in radians</returns>
        public static double Radians(double x)
        {
            return x * PIx / 180;
        }

        /// <summary>
        /// Calculate the distance between two places.
        /// </summary>
        /// <param name="lon1"></param>
        /// <param name="lat1"></param>
        /// <param name="lon2"></param>
        /// <param name="lat2"></param>
        /// <returns></returns>
        public static double DistanceBetweenPlaces(
            double lon1,
            double lat1,
            double lon2,
            double lat2)
        {
            double dlon = Radians(lon2 - lon1);
            double dlat = Radians(lat2 - lat1);

            double a = (Math.Sin(dlat / 2) * Math.Sin(dlat / 2)) + Math.Cos(Radians(lat1)) * Math.Cos(Radians(lat2)) * (Math.Sin(dlon / 2) * Math.Sin(dlon / 2));
            double angle = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
            return angle * RADIUS;
        }
    }

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