//GCJ-02(火星,高德) 坐标转换成 BD-09(百度) 坐标
//@param bd_lon 百度经度
//@param bd_lat 百度纬度
function bd_encrypt($gg_lon,$gg_lat)
{
$x_pi = 3.14159265358979324 * 3000.0 / 180.0;
$x = $gg_lon;
$y = $gg_lat;
$z = sqrt($x * $x + $y * $y) - 0.00002 * sin($y * $x_pi);
$theta = atan2($y, $x) - 0.000003 * cos($x * $x_pi);
$data['bd_lon'] = $z * cos($theta) + 0.0065;
$data['bd_lat'] = $z * sin($theta) + 0.006;
return $data;
}
//BD-09(百度) 坐标转换成 GCJ-02(火星,高德) 坐标
//@param bd_lon 百度经度
//@param bd_lat 百度纬度
function bd_decrypt($bd_lon,$bd_lat)
{
$x_pi = 3.14159265358979324 * 3000.0 / 180.0;
$x = $bd_lon - 0.0065;
$y = $bd_lat - 0.006;
$z = sqrt($x * $x + $y * $y) - 0.00002 * sin($y * $x_pi);
$theta = atan2($y, $x) - 0.000003 * cos($x * $x_pi);
$data['gg_lon'] = $z * cos($theta);
$data['gg_lat'] = $z * sin($theta);
return $data;
}
//测试
$bd = bd_encrypt(108.947903,34.231966);
//输出:array(2) { ["bd_lon"]=> float(108.954466795) ["bd_lat"]=> float(34.2376965936) }
$gg = bd_decrypt(108.95434,34.238235);
//输出:array(2) { ["gg_lon"]=> float(108.947903625) ["gg_lat"]=> float(34.2319662425) }
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