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)
百度标准,百度 SDK,百度地图,Geocoding 使用(本来就乱了,百度又在火星坐标上来个二次加密)
4、国内主流各地图API坐标系统比较
API | 坐标系 |
百度地图API | 百度坐标 |
腾讯搜搜地图API | 火星坐标 |
阿里云地图API | 火星坐标 |
高德MapABC地图API | 火星坐标 |
谷歌地图API | 火星坐标 |
二、PHP代码
坐标数据模型class Coordinate
{
public $x = 0;//lat
public $y = 0; // lng
public $z = 0; // other
function __construct($lat,$lng)
{
$this->x = $lat;
$this->y = $lng;
}
}
转换处理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;
}
}
测试<?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
?>
转载请注明:隨習筆記 » 各地图导航工具的坐标值的相互转换