火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法

//GCJ-02转换BD-09
function GCJTobaidu($lat, $lng){
$v = M_PI * 3000.0 / 180.0;
$x = $lng;
$y = $lat;

$z = sqrt($x * $x + $y * $y) + 0.00002 * sin($y * $v);
$t = atan2($y, $x) + 0.000003 * cos($x * $v);

return array(
'lat' => $z * sin($t) + 0.006,
'lng' => $z * cos($t) + 0.0065
);
}

$lat = 32.1287736098;
$lng = 114.082163843;
$coordinate = GCJTobaidu($lat, $lng);
var_dump($coordinate);

//BD-09转换GCJ-02
function baiduToGCJ($lat, $lng){
$v = M_PI * 3000.0 / 180.0;
$x = $lng - 0.0065;
$y = $lat - 0.006;

$z = sqrt($x * $x + $y * $y) - 0.00002 * sin($y * $v);
$t = atan2($y, $x) - 0.000003 * cos($x * $v);

return array(
'lat' => $z * sin($t),
'lng' => $z * cos($t)
);
}

$lat = 32.134632;
$lng = 114.088683;
$coordinate = baiduToGCJ($lat, $lng);
var_dump($coordinate);