Calculates the distance between 2 coordinates (latitude and longitude),. Net

. Net calculates the distance between 2 points, or calculates the distance between 2 coordinates and 2 latitude and longitude.

The code is as follows:

1 /// <summary>2     ///calculates the distance between the Geographics locations3     /// </summary>4      Public Static classgeodistance5     {6          Public Static DoubleBetween (DoubleLatitude1,DoubleLongitude1,DoubleLatitude2,DoubleLongitude2,7Distanceunits units =distanceunits.kilometers)8         {9             DoubleA1 = Latitude1 *Radianconversionfactor;Ten             DoubleB1 = Longitude1 *Radianconversionfactor; One             Doublea2 = Latitude2 *Radianconversionfactor; A             Doubleb2 = Longitude2 *Radianconversionfactor; -  -             DoubleDistance = theMath.acos (Math.Cos (A1) * MATH.COS (B1) * MATH.COS (A2) * Math.Cos (B2) + -Math.Cos (A1) * Math.sin (B1) * MATH.COS (A2) * Math.sin (B2) + math.sin (A1) * Math.sin (A2)) *Distanceconstants[units]; -  -             returndistance; +         } -  +         Private Const DoubleRadianconversionfactor = Math.PI/ the; A  at         Private Static ReadOnlyDictionary<distanceunits,Double> distanceconstants =NewDictionary<distanceunits,Double> (3) { -{distanceunits.miles,3963.1 }, -{distanceunits.nauticalmiles,3443.9 }, -{distanceunits.kilometers,6378 } -         }; -     } in  -      Public enumdistanceunits to     { + Miles, - Nauticalmiles, the kilometers, *}

The code was simple, but it took a lot of effort. is not yet tested how efficient. If there is an efficient algorithm, please do not stingy advice!!!

Calculates the distance between 2 coordinates (latitude and longitude),. Net