百度坐标系（BD-09）与国测局坐标系（GCJ-02）相互转换

百度坐标系 转 国测局坐标系

  function bd09_To_Gcj02($bd_lon, $bd_lat)
    {
        $bd_lon = trim($bd_lon);
        $bd_lat = trim($bd_lat);
        $x = $bd_lon - 0.0065;
        $y = $bd_lat - 0.006;
        $z = sqrt($x * $x + $y * $y) - 0.00002 * sin($y * pi());
        $theta = atan2($y, $x) - 0.000003 * cos($x * pi());
        $gg_lon = $z * cos($theta);
        $gg_lat = $z * sin($theta);
        return array($gg_lon, $gg_lat);

    }

国测局坐标系 转 百度坐标系

    function gcj02_To_Bd09($gg_lon, $gg_lat)
    {
        $x = trim($gg_lon);
        $y = trim($gg_lat);
        $z = sqrt($x * $x + $y * $y) + 0.00002 * sin($y * pi());
        $theta = atan2($y, $x) + 0.000003 * cos($x * pi());
        $bd_lon = $z * cos($theta) + 0.0065;
        $bd_lat = $z * sin($theta) + 0.006;
        return array($bd_lon, $bd_lat);
    }

扩展

开发者 | WGS84、GCJ-02、BD-09都是什么鬼？
https://www.jianshu.com/p/559029832a67