Flex中常用的经纬度坐标与墨卡托坐标转换代码

package util{public class Coordinate{static var M_PI:Number=Math.PI;//经纬度转墨卡托// 经度(lon)，纬度(lat)public static function lon2Mercator(lon:Number):Number{var x:Number = lon *20037508.342789/180;return x;}public static function lat2Mercator(lat:Number):Number{var y:Number = Math.log(Math.tan((90+lat)*M_PI/360))/(M_PI/180);y = y *20037508.34789/180;return y;}//墨卡托转经纬度public static function Mercator2Lon(mercatorX:Number):Number{var x:Number = mercatorX/20037508.34*180;return x;}public static function Mercator2Lat(mercatorY:Number):Number{var y:Number = mercatorY/20037508.34*180;y= 180/M_PI*(2*Math.atan(Math.exp(y*M_PI/180))-M_PI/2);return y;}}}