title: Scale Google maps Marker Image by Meters(fixed geographic size)
body: <p>I have a svg file that I'm using it for the google map marker. The size is 65px x 65px.</p>
  
  <p>I want to make sure this customized marker can be scaled to 1500 meters. It should zoom while the map is zoom.</p>
  
  <p>I'm not sure how to make this work. Need a algorithm to calculate the scaledSize based on the zoom level and make user it is 1500 meters on the map.</p>
  
  <pre><code>            var offset = new google.maps.Point(50, 50);
              var getIcon = function (uid, selected) {
                  return {
                      url: svg_url,
                      anchor: offset,
                      scaledSize: sccaledSize // not sure what to put here
                  };
              };
              new google.maps.Marker({
                      position: new google.maps.LatLng(xx,yy),
                      icon: getIcon(Uid, false)
                  });
  </code></pre>