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Merge pull request #462 from mortenbekditlevsen/lldist

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Haversine distance formula for getting distance between two LatLngs
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Vladimir Agafonkin 2012-02-03 01:55:29 -08:00
commit 4c25fd8236
1 changed files with 14 additions and 0 deletions
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src/geo/LatLng.js
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@ -40,5 +40,19 @@ L.LatLng.prototype = {
return 'LatLng(' +
L.Util.formatNum(this.lat) + ', ' +
L.Util.formatNum(this.lng) + ')';
},
// Haversine distance formula, see http://en.wikipedia.org/wiki/Haversine_formula
distanceTo: function (/*LatLng*/ that)/*->Double*/ {
var R = 6378137; // earth radius in meters
var dLat = (that.lat - this.lat) * L.LatLng.DEG_TO_RAD;
var dLon = (that.lng - this.lng) * L.LatLng.DEG_TO_RAD;
var a = Math.sin(dLat / 2) * Math.sin(dLat / 2) +
Math.sin(dLon / 2) * Math.sin(dLon / 2) *
Math.cos(this.lat * L.LatLng.DEG_TO_RAD) *
Math.cos(that.lat * L.LatLng.DEG_TO_RAD);
var c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
var d = R * c;
return d;
}
};