In some web applications we will need to calculate the
distance between two points on earth’s surface. Mainly this is for advertising
purposes or to display locations based on distance. Up on considering the points as two places on earth’s surface, the shortest distance becomes the
great circle distance. The great-circle or orthodromic distance is
the shortest distance between any two points on
the surface of a sphere measured along a path on the surface of the sphere
(as opposed to going through the sphere's interior). You can calculate the
distance based on this theory but it is already available in websites.
You can see the best one of them at http://www.geodatasource.com/distance-calculator
Also the code for various platforms is available at http://www.geodatasource.com/developers
By using this method of calculation you can find the distance in
KM, Miles or in Nautical Miles according to your requirement.
Hope this helps !
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