Hmm... interesting --thank you Darren. Found a link w/ a Haversine
formula in js which is surprisingly simple too.. maybe I'm not so far
off (we'll see!)
Thanks again!
LatLong.distHaversine = function(p1, p2) {
var R = 6371; // earth's mean radius in km
var dLat = p2.lat - p1.lat;
var dLong = p2.lon - p1.lon;
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(p1.lat) * Math.cos(p2.lat) * Math.sin(dLong/2) *
Math.sin(dLong/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
var d = R * c;
return d;
}
http://www.movable-type.co.uk/scripts/LatLong.html
On 12/13/06, Darren Cook <[EMAIL PROTECTED]> wrote:
> > Getting some slightly 'off' results...anyone w/ a little geodata
> > experience up for checking my math here? Really appreciate any
> > suggestions for improving the code here too!
>
> There was an article in a recent php Architect (Vol 5, Issue 10)
> (http://www.phparch.com) where they gave this link:
> http://en.wikipedia.org/wiki/Haversine_formula
>
> FWIW, your code looks simpler than the php implementation in that
> article, so you may be missing something.
>
> Darren
>
>
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