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

laxmisaagar · by **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

lostdev · by **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

var R = 6371; // km
var dLat = (lat2-lat1).toRad();
var dLon = (lon2-lon1).toRad();
var lat1 = lat1.toRad();
var lat2 = lat2.toRad();
 
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
        Math.sin(dLon/2) * Math.sin(dLon/2) * Math.cos(lat1) * Math.cos(lat2); 
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a)); 
var d = R * c;
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Given two sets of lat,long how can we decide the distance

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

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

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