# Thread: Calculating Distance between Two Locations?

1. Hi, Does anyone know how to calculate the distance between two geographic coordinates(longitude and latitude)? Any help at all would be GREATLY appreciated, thanks

2. Class TLocality contains method Distance for calculating distance between two landmarks.

Or You can calculate distance via Haversinus (half the versed sine) formula:
http://wiki.forum.nokia.com/index.ph..._two_landmarks

3. The calculation is a bit simple:

First, calculate the distance between the two coordinates throght the cosine law:

cos(S) = sin(l1)*sin(l2)+cos(11)*cos(l2)*cos(dl)

where:

l1 and l2 are the latitude of the points
dl is the difference between the longitude of the points

S is the arc linking the two points. The secound step is multiply this value by 6378,1km (the aproximated radius of the Earth).

4. Hi genoulcha, Welcome to Dibo !

Your approach is correct only if distance between the points short.

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