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Add and Remove Leaflet Circle on Click
<!DOCTYPE html>
<meta charset="utf-8">
<html>
<head>
<title>Click Circle</title>
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.6.4/leaflet.css" />
<!--[if lte IE 8]>
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.6.4/leaflet.ie.css" />
<![endif]-->
<script src="http://cdn.leafletjs.com/leaflet-0.6.4/leaflet.js"></script>
<style type="text/css">
#map {
height: 500px;
}
</style>
</head>
<body>
<h1></h1>
<div id="map"></div>
<script type="text/javascript">
var map = L.map('map', {
center: [33.8, -84.4],
zoom: 11
});
L.tileLayer('http://tile.cloudmade.com/YOUR_API_KEY/29889/256/{z}/{x}/{y}.png', {
attribution: 'Map data &copy; <a href="http://openstreetmap.org">OpenStreetMap</a> contributors, <a href="http://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, Imagery © <a href="http://cloudmade.com">CloudMade</a>',
maxZoom: 18
}).addTo(map);
// click circle:
var clickCircle;
function onMapClick(e) {
if (clickCircle != undefined) {
map.removeLayer(clickCircle);
};
clickCircle = L.circle(e.latlng, 1609 * 3, {
color: '#f07300',
fillOpacity: 0,
opacity: 0.5
}).addTo(map);
}
map.on('click', onMapClick);
</script>
</body>
</html>

What is 1609*3 value?

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