You can get the latitude and longitude of any location on google map by just clicking on that location. Check this out:
But please make sure you have your own google api..
<!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.0 Strict//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd”>
<html xmlns=”http://www.w3.org/1999/xhtml”>
<head>
<meta http-equiv=”content-type” content=”text/html; charset=utf-8″/>
<title>
Google Visualization API Sample
</title>
<!–<script type=”text/javascript” src=”http://www.google.com/jsapi”></script>–>
<script src=”http://maps.google.com/maps?file=api&v=2&key=ABQIAAAA_pv6r9wQUcY29kuVsKu_WRQNER5ay7E813Acg9jrQ4QegGSv
oxQtPvukQA-F6gkLXexTdocP127B3g” type=”text/javascript”></script>
<script type=”text/javascript”>
//<![CDATA[
var marca;
var latinput;
var loninput;
var mapleveli;
testing = function load() {
if (GBrowserIsCompatible()) {
var map = new GMap2(document.getElementById(“map”));
//map.setCenter(new GLatLng(8.984868485653589, -79.51179027557373), 15);
map.setCenter(new GLatLng(37.4419, -122.1419), 15);
var point = new GLatLng(37.4419, -122.1419);
map.addControl(new GLargeMapControl());
map.addControl(new GMapTypeControl());
latinput=document.getElementById(“latinput”);
loninput=document.getElementById(“loninput”);
mapleveli=document.getElementById(“maplevel”);
GEvent.addListener(map,”click”, function(overlay,point) {
//alert(point.x+” “+point.y);
//alert(point);
if(marca){
marca.hide();
marca=new GMarker(point,{“clickable”:false});
map.addOverlay(marca);
latinput.value=point.y;
loninput.value=point.x;
mapleveli.value=map.getZoom()
}
else{
marca=new GMarker(point,{“clickable”:false});
map.addOverlay(marca);
latinput.value=point.y;
loninput.value=point.x;
mapleveli.value=map.getZoom()
}
});
}
}
window.onload=testing;
//]]>
</script>
</head>
<body style=”font-family: Arial;border: 0 none;”>
<label>Property Map Location</label>
<div id=”map” style=”width: 920px; height: 500px”>Loading…</div>
Latitude: <input name=”data[Property][latitude]” id=”latinput” value=”8.984868485653589″>
Longitude: <input name=”data[Property][longitude]” id=”loninput” value=”-79.51179027557373″>
Map level <input name=”data[Property][maplevel]” id=”maplevel” value=”15″>
</body>
</html>