一、坐标系介绍

1、地球坐标 (WGS84)

• 国际标准，从专业GPS 设备中取出的数据的坐标系
• 国际地图提供商使用的坐标系

2、火星坐标 (GCJ-02)也叫国测局坐标系

• 中国标准，从国行移动设备中定位获取的坐标数据使用这个坐标系
• 国家规定： 国内出版的各种地图系统（包括电子形式），必须至少采用GCJ-02对地理位置进行首次加密。

3、百度坐标 (BD-09)

4、国内主流各地图API坐标系统比较

二、PHP代码

class Coordinate
{
    public  $x = 0;//lat
    public  $y = 0; // lng
    public  $z = 0; // other
    
    function __construct($lat,$lng)
    {
        $this->x = $lat;
        $this->y = $lng;
    }
}

define('X_PI',3.14159265358979324*3000.0/180.0);
 
class GeoTransUtil
{
    private static $x_pi = X_PI;
    private static $pi = 3.14159265358979324;
    private static $a = 6378245.0;
    private static $ee = 0.00669342162296594323;
    
    /**
     * 火星坐标(GCJ02坐标，高德，谷歌，腾讯坐标)到百度坐标BD-09
     */
    public static function gcjTObd($from){
        $x = $from->y;
        $y = $from->x;
        $z = sqrt($x * $x + $y * $y) + 0.00002 * sin($y * self::$x_pi);  
        $theta = atan2($y, $x) + 0.000003 * cos($x * self::$x_pi);
        $to = new Coordinate($z * sin($theta) + 0.006,$z * cos($theta) + 0.0065);
        return ($to);
    }
    
    /**
     * 百度坐标BD-09到火星坐标GCJ02(高德，谷歌，腾讯坐标)
     */
    public static function bdTOgcj($from){
        $x = $from->y - 0.0065;
        $y = $from->x - 0.006;
        $z = sqrt($x * $x + $y * $y) - 0.00002 * sin($y * self::$x_pi); 
        $theta = atan2($y, $x) - 0.000003 * cos($x * self::$x_pi);
        $to = new Coordinate($z * sin($theta),$z * cos($theta));
        return ($to);
    }
    
    /**
     * WGS-84(GPS坐标，谷歌地球坐标) 到 GCJ-02(火星坐标) 的转换
     */
    public static function wgsTOgcj($from){
        //double wgLat, double wgLon, out double mgLat, out double mgLon
            $wgLat = $from->x;
            $wgLon = $from->y;
        if (self::outOfChina($wgLat, $wgLon)){
            return (new Coordinate($wgLat, $wgLon));
        }
        
        $dLat = GeoTransUtil::transformLat($wgLon - 105.0, $wgLat - 35.0);
        $dLon = GeoTransUtil::transformLon($wgLon - 105.0, $wgLat - 35.0);
        $radLat = $wgLat / 180.0 * self::$pi;
        $magic = sin($radLat);
        $magic = 1 - self::$ee * $magic * $magic;
        $sqrtMagic = sqrt($magic);
        $dLat = ($dLat * 180.0) / ((self::$a * (1 - self::$ee)) / ($magic * $sqrtMagic) * self::$pi);
        $dLon = ($dLon * 180.0) / (self::$a / $sqrtMagic * cos($radLat) * self::$pi);
        
        $mgLat = $wgLat + $dLat;
        $mgLon = $wgLon + $dLon;
        
        return (new Coordinate($mgLat, $mgLon));
    }
 
    /**
     * GCJ-02 到 WGS-84 的转换
     */
    public static function gcjTOwgs($from){
        $to = self::wgsTOgcj($from);
        $lat = $from->x;
        $lon = $from->y;
        $g_lat = $to->x;
        $g_lon = $to->y;
        $d_lat = $g_lat - $lat;
        $d_lon = $g_lon - $lon;
        
        return new Coordinate($lat - $d_lat, $lon - $d_lon);
    }
    
    /**
     * 把地球经纬度转换为lat和lng
     */
    public static function earthCoordinate($t1, $t2) {
        $tt1 = $t1->x + $t1->y/60.0 + $t1->z/3600.0;
        $tt2 = $t2->x + $t2->y/60.0 + $t2->z/3600.0;
        
        return (new Coordinate($tt1, $tt2));
    }
    
    private static function outOfChina($lat,$lon)
    {
        if ($lon < 72.004 || $lon > 137.8347)
            return true;
        if ($lat < 0.8293 || $lat > 55.8271)
            return true;
        
        return false;
    }
 
    private static function transformLat($x,$y)
    {
        $ret = -100.0 + 2.0 * $x + 3.0 * $y + 0.2 * $y * $y + 0.1 * $x * $y + 0.2 * sqrt(abs($x));
        $ret += (20.0 * sin(6.0 * $x * self::$pi) + 20.0 * sin(2.0 * $x * self::$pi)) * 2.0 / 3.0;
        $ret += (20.0 * sin($y * self::$pi) + 40.0 * sin($y / 3.0 * self::$pi)) * 2.0 / 3.0;
        $ret += (160.0 * sin($y / 12.0 * self::$pi) + 320 * sin($y * self::$pi / 30.0)) * 2.0 / 3.0;
        return $ret;
    }
 
    private static function transformLon($x, $y)
    {
        $ret = 300.0 + $x + 2.0 * $y + 0.1 * $x * $x + 0.1 * $x * $y + 0.1 * sqrt(abs($x));
        $ret += (20.0 * sin(6.0 * $x * self::$pi) + 20.0 * sin(2.0 * $x * self::$pi)) * 2.0 / 3.0;
        $ret += (20.0 * sin($x * self::$pi) + 40.0 * sin($x / 3.0 * self::$pi)) * 2.0 / 3.0;
        $ret += (150.0 * sin($x / 12.0 * self::$pi) + 300.0 * sin($x / 30.0 * self::$pi)) * 2.0 / 3.0;
        return $ret;
    }
    
}

<?php
 $from = new Coordinate(27.980374, 120.685213);
 $ret = GeoTransUtil::gcjTObd($from);
 echo 'GCJ TO BD:' . $ret->y.','.$ret->x."\r\n";
 
 $from = new Coordinate(27.986039, 120.691609);
 $ret = GeoTransUtil::bdTOgcj($from);
 echo 'BD TO GCJ:' . $ret->y.','.$ret->x."\r\n";

// CMS 终端运行后的结果
//  D:\>php map.php
// GCJ TO BD:120.69175088041,27.986288154528
// BD TO GCJ:120.68507084493,27.980126792865
?>

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