Revision: 21960
at December 26, 2009 17:57 by ginoplusio

Initial Code
```function distance(lat1,lon1,lat2,lon2) {
var R = 6371; // km (change this constant to get miles)
var dLat = (lat2-lat1) * Math.PI / 180;
var dLon = (lon2-lon1) * Math.PI / 180;
var a = Math.sin(dLat/2) * Math.sin(dLat/2) +
Math.cos(lat1 * Math.PI / 180 ) * Math.cos(lat2 * Math.PI / 180 ) *
Math.sin(dLon/2) * Math.sin(dLon/2);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1-a));
var d = R * c;
if (d>1) return Math.round(d)+"km";
else if (d<=1) return Math.round(d*1000)+"m";
return d;
}```

Initial URL
`http://www.barattalo.it/2009/12/26/decimal-degrees-conversion-and-distance-of-two-points-on-google-map/`

Initial Description
`This function calculates distance with the Haversine formula, this formula assumes that our Earth is spherical, but it isnâ€™t since itâ€™s more like a big orange fruit also compresses at poles. Iâ€™ve read that this function has an error about + o â€“ 3 meters (it depends), but itâ€™s a small error for many purposes.`

Initial Title
`Calculate distance between two points with latitude and longitude coordinates`

Initial Tags
`javascript, google`

Initial Language
`JavaScript`