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    <ol> <li>You need a dataset with fields for the airport`s latitude and longitude</li> <li>Use the calculation for Great-Circle distance (GCD) as outlined on the page linked below</li> </ol> <p><a href="http://en.wikipedia.org/wiki/Great-circle_distance" rel="nofollow" title="on Wikipedia">Wikipedia article on GCD</a></p> <p>Please provide example code/specify the language if you would like further and more specific help</p> <p><strong>CODE:</strong></p> <p>Taken from another webpage (now defunct, used <a href="http://web.archive.org/web/20101228001530/http://www.codecodex.com/wiki/Calculate_Distance_Between_Two_Points_on_a_Globe#C.23" rel="nofollow">waybackmachine</a>)</p> <pre><code>using System; namespace HaversineFormula { /// &lt;summary&gt; /// The distance type to return the results in. /// &lt;/summary&gt; public enum DistanceType { Miles, Kilometers }; /// &lt;summary&gt; /// Specifies a Latitude / Longitude point. /// &lt;/summary&gt; public struct Position { public double Latitude; public double Longitude; } class Haversine { /// &lt;summary&gt; /// Returns the distance in miles or kilometers of any two /// latitude / longitude points. /// &lt;/summary&gt; /// &lt;param name=”pos1″&gt;&lt;/param&gt; /// &lt;param name=”pos2″&gt;&lt;/param&gt; /// &lt;param name=”type”&gt;&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; public double Distance(Position pos1, Position pos2, DistanceType type) { double R = (type == DistanceType.Miles) ? 3960 : 6371; double dLat = this.toRadian(pos2.Latitude - pos1.Latitude); double dLon = this.toRadian(pos2.Longitude - pos1.Longitude); double a = Math.Sin(dLat / 2) * Math.Sin(dLat / 2) + Math.Cos(this.toRadian(pos1.Latitude)) * Math.Cos(this.toRadian(pos2.Latitude)) * Math.Sin(dLon / 2) * Math.Sin(dLon / 2); double c = 2 * Math.Asin(Math.Min(1, Math.Sqrt(a))); double d = R * c; return d; } /// &lt;summary&gt; /// Convert to Radians. /// &lt;/summary&gt; /// &lt;param name="val"&gt;&lt;/param&gt; /// &lt;returns&gt;&lt;/returns&gt; private double toRadian(double val) { return (Math.PI / 180) * val; } } } </code></pre> <p><strong>Pseudocode:</strong></p> <p>This pseudocode should give you the answer you are looking for. I didn't test this and the C# will probably have syntactic errors but the gist of it should be clear.</p> <pre><code>/* Set parameters */ Position currentPosition = new Position(); Position airportPosition = new Position(); Double minDistance = Double.MaxValue; String closestAirportName = "UNKNOWN"; Haversine hv = new Haversine(); /* Set current position, remains fixed throughout */ currentPosition.Latitude = 0.000; currentPosition.Longitude = 0.000; /* Compare distance to each airport with current location * and save results if this is the closest airport so far*/ Foreach (airport in airports) { airportPosition = new Position(airport.Lat, airport.Lon); Double distanceToAirport = hv.Distance(currentPosition, airportPosition, DistanceType.Kilometers) if (distanceToAirport &lt; minDistance) { minDistance = distanceToAirport closestAirportName = airport.Name } } </code></pre>
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    1. POFind closest airport based on latitude and longitude
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    1. USJustinJDavies
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    1. POFind closest airport based on latitude and longitude
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    1. COI am looking the code in C#..
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      1. USDurga Prasad
    2. CO@user1273278: If you need a specific implementation of a distance algorithm along the curved surface of the Earth, I have an old blog post that does it in SQL: http://publicvoidlife.blogspot.com/2011/02/shortest-distance-between-two-points-is.html Translating it into C# should be pretty simple, it's mostly just parentheses, basic arithmetic, and built-in math functions.
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      1. USDavid
    3. COMight be, I didn't write my question very clearly. When user open my application I can find Latitude and Longitude, using those parameters I need to find out nearest airport.
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      1. USDurga Prasad
 

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