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anddev.org • View topic - Given two sets of lat,long how can we decide the distance

Given two sets of lat,long how can we decide the distance

Tutorials that use the MapActivity. Many using GPS functionality.

Given two sets of lat,long how can we decide the distance

Postby laxmisaagar » Tue Oct 11, 2011 10:24 am

Hi,
I have two sets of long ,lat of points A and B . How do we decide the distance between these two points ?
Is there any android API to do that ? Or any hardcore logic ?

Thanks,
laxmisaagar :)
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Re: Given two sets of lat,long how can we decide the distanc

Postby lostdev » Tue Feb 21, 2012 6:27 pm

To the best of my knowledge there is no built in API for this.

You need to use the haversine formula for calculating great circle distances. I am not at a computer with my code so here's a javascript formula I found from googling. Adapt for whatever language you're coding in.

Syntax: [ Download ] [ Hide ]
Using javascript Syntax Highlighting
  1. var R = 6371; // km
  2. var dLat = (lat2-lat1).toRad();
  3. var dLon = (lon2-lon1).toRad();
  4. var lat1 = lat1.toRad();
  5. var lat2 = lat2.toRad();
  6.  
  7. var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
  8.         Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2);
  9. var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
  10. var d = R * c;
Parsed in 0.001 seconds, using GeSHi 1.0.8.4
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