+ function getScale() {
+ var bounds = map.getBounds(),
+ centerLat = bounds.getCenter().lat,
+ halfWorldMeters = 6378137 * Math.PI * Math.cos(centerLat * Math.PI / 180),
+ meters = halfWorldMeters * (bounds.getEast() - bounds.getWest()) / 180,
+ pixelsPerMeter = map.getSize().x / meters,
+ metersPerPixel = 1 / (92 * 39.3701);
+ return Math.round(1 / (pixelsPerMeter * metersPerPixel));
+ }
+