摘要：转换的结果和百度提供的接口精确到小数点后位请放心使用卫星椭球坐标投影到平面地图坐标系的投影因子。
WGS-84：是国际标准，GPS坐标（Google Earth使用、或者GPS模块）
GCJ-02：中国坐标偏移标准，Google Map、高德、腾讯使用
BD-09：百度坐标偏移标准，Baidu Map使用
WGS-84 to GCJ-02GPS.gcj_encrypt();GCJ-02 to WGS-84 粗略
GPS.gcj_decrypt();GCJ-02 to WGS-84 精确(二分极限法)
// var threshold = 0.000000001; 目前设置的是精确到小数点后9位，这个值越小，越精确，但是javascript中，浮点运算本身就不太精确，九位在GPS里也偏差不大了 GSP.gcj_decrypt_exact();GCJ-02 to BD-09
GPS.bd_encrypt();BD-09 to GCJ-02
GPS.bd_decrypt();求距离
GPS.distance();示例：
document.write("GPS: 39.933676862706776,116.35608315379092
");
var arr2 = GPS.gcj_encrypt(39.933676862706776, 116.35608315379092);
document.write("中国:" + arr2["lat"]+","+arr2["lon"]+"
");
var arr3 = GPS.gcj_decrypt_exact(arr2["lat"], arr2["lon"]);
document.write("逆算:" + arr3["lat"]+","+arr3["lon"]+" 需要和第一行相似（目前是小数点后9位相等）");
PHP本算法 gcj算法、bd算法都非常精确，已经测试通过。
（BD转换的结果和百度提供的接口精确到小数点后4位）
请放心使用
x_pi = 3.14159265358979324 * 3000.0 / 180.0;
}
//WGS-84 to GCJ-02
public function gcj_encrypt($wgsLat, $wgsLon) {
//if ($this->outOfChina($wgsLat, $wgsLon))
if (!$this->isInChina($wgsLat, $wgsLon))
return array("lat" => $wgsLat, "lon" => $wgsLon);
$d = $this->delta($wgsLat, $wgsLon);
return array("lat" => $wgsLat + $d["lat"],"lon" => $wgsLon + $d["lon"]);
}
//GCJ-02 to WGS-84
public function gcj_decrypt($gcjLat, $gcjLon) {
//if ($this->outOfChina($gcjLat, $gcjLon))
if (!$this->isInChina($gcjLat, $gcjLon))
return array("lat" => $gcjLat, "lon" => $gcjLon);
$d = $this->delta($gcjLat, $gcjLon);
return array("lat" => $gcjLat - $d["lat"], "lon" => $gcjLon - $d["lon"]);
}
//GCJ-02 to WGS-84 exactly
public function gcj_decrypt_exact($gcjLat, $gcjLon) {
$initDelta = 0.01;
$threshold = 0.000000001;
$dLat = $initDelta; $dLon = $initDelta;
$mLat = $gcjLat - $dLat; $mLon = $gcjLon - $dLon;
$pLat = $gcjLat + $dLat; $pLon = $gcjLon + $dLon;
$wgsLat = 0; $wgsLon = 0; $i = 0;
while (TRUE) {
$wgsLat = ($mLat + $pLat) / 2;
$wgsLon = ($mLon + $pLon) / 2;
$tmp = $this->gcj_encrypt($wgsLat, $wgsLon);
$dLat = $tmp["lat"] - $gcjLat;
$dLon = $tmp["lon"] - $gcjLon;
if ((abs($dLat) < $threshold) && (abs($dLon) < $threshold))
break;
if ($dLat > 0) $pLat = $wgsLat; else $mLat = $wgsLat;
if ($dLon > 0) $pLon = $wgsLon; else $mLon = $wgsLon;
if (++$i > 10000) break;
}
//console.log(i);
return array("lat" => $wgsLat, "lon"=> $wgsLon);
}
//GCJ-02 to BD-09
public function bd_encrypt($gcjLat, $gcjLon) {
$x = $gcjLon; $y = $gcjLat;
$z = sqrt($x * $x + $y * $y) + 0.00002 * sin($y * $this->x_pi);
$theta = atan2($y, $x) + 0.000003 * cos($x * $this->x_pi);
$bdLon = $z * cos($theta) + 0.0065;
$bdLat = $z * sin($theta) + 0.006;
return array("lat" => $bdLat,"lon" => $bdLon);
}
//BD-09 to GCJ-02
public function bd_decrypt($bdLat, $bdLon)
{
$x = $bdLon - 0.0065; $y = $bdLat - 0.006;
$z = sqrt($x * $x + $y * $y) - 0.00002 * sin($y * $this->x_pi);
$theta = atan2($y, $x) - 0.000003 * cos($x * $this->x_pi);
$gcjLon = $z * cos($theta);
$gcjLat = $z * sin($theta);
return array("lat" => $gcjLat, "lon" => $gcjLon);
}
//WGS-84 to Web mercator
//$mercatorLat -> y $mercatorLon -> x
public function mercator_encrypt($wgsLat, $wgsLon)
{
$x = $wgsLon * 20037508.34 / 180.;
$y = log(tan((90. + $wgsLat) * $this->PI / 360.)) / ($this->PI / 180.);
$y = $y * 20037508.34 / 180.;
return array("lat" => $y, "lon" => $x);
/*
if ((abs($wgsLon) > 180 || abs($wgsLat) > 90))
return NULL;
$x = 6378137.0 * $wgsLon * 0.017453292519943295;
$a = $wgsLat * 0.017453292519943295;
$y = 3189068.5 * log((1.0 + sin($a)) / (1.0 - sin($a)));
return array("lat" => $y, "lon" => $x);
//*/
}
// Web mercator to WGS-84
// $mercatorLat -> y $mercatorLon -> x
public function mercator_decrypt($mercatorLat, $mercatorLon)
{
$x = $mercatorLon / 20037508.34 * 180.;
$y = $mercatorLat / 20037508.34 * 180.;
$y = 180 / $this->PI * (2 * atan(exp($y * $this->PI / 180.)) - $this->PI / 2);
return array("lat" => $y, "lon" => $x);
/*
if (abs($mercatorLon) < 180 && abs($mercatorLat) < 90)
return NULL;
if ((abs($mercatorLon) > 20037508.3427892) || (abs($mercatorLat) > 20037508.3427892))
return NULL;
$a = $mercatorLon / 6378137.0 * 57.295779513082323;
$x = $a - (floor((($a + 180.0) / 360.0)) * 360.0);
$y = (1.5707963267948966 - (2.0 * atan(exp((-1.0 * $mercatorLat) / 6378137.0)))) * 57.295779513082323;
return array("lat" => $y, "lon" => $x);
//*/
}
// two point"s distance
public function distance($latA, $lonA, $latB, $lonB)
{
$earthR = 6371000.;
$x = cos($latA * $this->PI / 180.) * cos($latB * $this->PI / 180.) * cos(($lonA - $lonB) * $this->PI / 180);
$y = sin($latA * $this->PI / 180.) * sin($latB * $this->PI / 180.);
$s = $x + $y;
if ($s > 1) $s = 1;
if ($s < -1) $s = -1;
$alpha = acos($s);
$distance = $alpha * $earthR;
return $distance;
/*
$earthRadius = 6367000; //approximate radius of earth in meters
$latA = ($latA * $this->PI ) / 180;
$lonA = ($lonA * $this->PI ) / 180;
$latA = ($latA * $this->PI ) / 180;
$lonB = ($lonB * $this->PI ) / 180;
$calcLongitude = $lonB - $lonA;
$calcLatitude = $latA - $latA;
$stepOne = pow(sin($calcLatitude / 2), 2) + cos($latA) * cos($latA) * pow(sin($calcLongitude / 2), 2);
$stepTwo = 2 * asin(min(1, sqrt($stepOne)));
$calculatedDistance = $earthRadius * $stepTwo;
return round($calculatedDistance);
*/
}
private function delta($lat, $lon)
{
// Krasovsky 1940
//
// a = 6378245.0, 1/f = 298.3
// b = a * (1 - f)
// ee = (a^2 - b^2) / a^2;
$a = 6378245.0;// a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
$ee = 0.00669342162296594323;// ee: 椭球的偏心率。
$dLat = $this->transformLat($lon - 105.0, $lat - 35.0);
$dLon = $this->transformLon($lon - 105.0, $lat - 35.0);
$radLat = $lat / 180.0 * $this->PI;
$magic = sin($radLat);
$magic = 1 - $ee * $magic * $magic;
$sqrtMagic = sqrt($magic);
$dLat = ($dLat * 180.0) / (($a * (1 - $ee)) / ($magic * $sqrtMagic) * $this->PI);
$dLon = ($dLon * 180.0) / ($a / $sqrtMagic * cos($radLat) * $this->PI);
return array("lat" => $dLat, "lon" => $dLon);
}
private function rectangle($lng1, $lat1, $lng2, $lat2) {
return array(
"west" => min($lng1, $lng2),
"north" => max($lat1, $lat2),
"east" => max($lng1, $lng2),
"south" => min($lat1, $lat2),
);
}
private function isInRect($rect, $lon, $lat) {
return $rect["west"] <= $lon && $rect["east"] >= $lon && $rect["north"] >= $lat && $rect["south"] <= $lat;
}
private function isInChina($lat, $lon) {
//China region - raw data
//http://www.cnblogs.com/Aimeast/archive/2012/08/09/2629614.html
$region = array(
$this->rectangle(79.446200, 49.220400, 96.330000,42.889900),
$this->rectangle(109.687200, 54.141500, 135.000200, 39.374200),
$this->rectangle(73.124600, 42.889900, 124.143255, 29.529700),
$this->rectangle(82.968400, 29.529700, 97.035200, 26.718600),
$this->rectangle(97.025300, 29.529700, 124.367395, 20.414096),
$this->rectangle(107.975793, 20.414096, 111.744104, 17.871542),
);
//China excluded region - raw data
$exclude = array(
$this->rectangle(119.921265, 25.398623, 122.497559, 21.785006),
$this->rectangle(101.865200, 22.284000, 106.665000, 20.098800),
$this->rectangle(106.452500, 21.542200, 108.051000, 20.487800),
$this->rectangle(109.032300, 55.817500, 119.127000, 50.325700),
$this->rectangle(127.456800, 55.817500, 137.022700, 49.557400),
$this->rectangle(131.266200, 44.892200, 137.022700, 42.569200),
);
for ($i = 0; $i < count($region); $i++)
if ($this->isInRect($region[$i], $lon, $lat))
{
for ($j = 0; $j < count($exclude); j++)
if ($this->isInRect($exclude[$j], $lon, $lat))
return false;
return true;
}
return false;
}
private function outOfChina($lat, $lon)
{
if ($lon < 72.004 || $lon > 137.8347)
return TRUE;
if ($lat < 0.8293 || $lat > 55.8271)
return TRUE;
return FALSE;
}
private function transformLat($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 * $this->PI) + 20.0 * sin(2.0 * $x * $this->PI)) * 2.0 / 3.0;
$ret += (20.0 * sin($y * $this->PI) + 40.0 * sin($y / 3.0 * $this->PI)) * 2.0 / 3.0;
$ret += (160.0 * sin($y / 12.0 * $this->PI) + 320 * sin($y * $this->PI / 30.0)) * 2.0 / 3.0;
return $ret;
}
private function transformLon($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 * $this->PI) + 20.0 * sin(2.0 * $x * $this->PI)) * 2.0 / 3.0;
$ret += (20.0 * sin($x * $this->PI) + 40.0 * sin($x / 3.0 * $this->PI)) * 2.0 / 3.0;
$ret += (150.0 * sin($x / 12.0 * $this->PI) + 300.0 * sin($x / 30.0 * $this->PI)) * 2.0 / 3.0;
return $ret;
}
}
Javascript
var GPS = {
PI : 3.14159265358979324,
x_pi : 3.14159265358979324 * 3000.0 / 180.0,
delta : function (lat, lon) {
// Krasovsky 1940
//
// a = 6378245.0, 1/f = 298.3
// b = a * (1 - f)
// ee = (a^2 - b^2) / a^2;
var a = 6378245.0; // a: 卫星椭球坐标投影到平面地图坐标系的投影因子。
var ee = 0.00669342162296594323; // ee: 椭球的偏心率。
var dLat = this.transformLat(lon - 105.0, lat - 35.0);
var dLon = this.transformLon(lon - 105.0, lat - 35.0);
var radLat = lat / 180.0 * this.PI;
var magic = Math.sin(radLat);
magic = 1 - ee * magic * magic;
var sqrtMagic = Math.sqrt(magic);
dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * this.PI);
dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * this.PI);
return {"lat": dLat, "lon": dLon};
},
//WGS-84 to GCJ-02
gcj_encrypt : function (wgsLat, wgsLon) {
//if (this.outOfChina(wgsLat, wgsLon))
if (!this.isInChina(wgsLat, wgsLon))
return {"lat": wgsLat, "lon": wgsLon};
var d = this.delta(wgsLat, wgsLon);
return {"lat" : parseFloat(wgsLat) + parseFloat(d.lat),"lon" : parseFloat(wgsLon) + parseFloat(d.lon)};
},
//GCJ-02 to WGS-84
gcj_decrypt : function (gcjLat, gcjLon) {
if (!this.isInChina(wgsLat, wgsLon))
//if (this.outOfChina(gcjLat, gcjLon))
return {"lat": gcjLat, "lon": gcjLon};
var d = this.delta(gcjLat, gcjLon);
return {"lat": gcjLat - d.lat, "lon": gcjLon - d.lon};
},
//GCJ-02 to WGS-84 exactly
gcj_decrypt_exact : function (gcjLat, gcjLon) {
var initDelta = 0.01;
var threshold = 0.000000001;
var dLat = initDelta, dLon = initDelta;
var mLat = gcjLat - dLat, mLon = gcjLon - dLon;
var pLat = gcjLat + dLat, pLon = gcjLon + dLon;
var wgsLat, wgsLon, i = 0;
while (1) {
wgsLat = (mLat + pLat) / 2;
wgsLon = (mLon + pLon) / 2;
var tmp = this.gcj_encrypt(wgsLat, wgsLon)
dLat = tmp.lat - gcjLat;
dLon = tmp.lon - gcjLon;
if ((Math.abs(dLat) < threshold) && (Math.abs(dLon) < threshold))
break;
if (dLat > 0) pLat = wgsLat; else mLat = wgsLat;
if (dLon > 0) pLon = wgsLon; else mLon = wgsLon;
if (++i > 10000) break;
}
//console.log(i);
return {"lat": wgsLat, "lon": wgsLon};
},
//GCJ-02 to BD-09
bd_encrypt : function (gcjLat, gcjLon) {
var x = gcjLon, y = gcjLat;
var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * this.x_pi);
var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * this.x_pi);
bdLon = z * Math.cos(theta) + 0.0065;
bdLat = z * Math.sin(theta) + 0.006;
return {"lat" : bdLat,"lon" : bdLon};
},
//BD-09 to GCJ-02
bd_decrypt : function (bdLat, bdLon) {
var x = bdLon - 0.0065, y = bdLat - 0.006;
var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * this.x_pi);
var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * this.x_pi);
var gcjLon = z * Math.cos(theta);
var gcjLat = z * Math.sin(theta);
return {"lat" : gcjLat, "lon" : gcjLon};
},
//WGS-84 to Web mercator
//mercatorLat -> y mercatorLon -> x
mercator_encrypt : function(wgsLat, wgsLon) {
var x = wgsLon * 20037508.34 / 180.;
var y = Math.log(Math.tan((90. + wgsLat) * this.PI / 360.)) / (this.PI / 180.);
y = y * 20037508.34 / 180.;
return {"lat" : y, "lon" : x};
/*
if ((Math.abs(wgsLon) > 180 || Math.abs(wgsLat) > 90))
return null;
var x = 6378137.0 * wgsLon * 0.017453292519943295;
var a = wgsLat * 0.017453292519943295;
var y = 3189068.5 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));
return {"lat" : y, "lon" : x};
//*/
},
// Web mercator to WGS-84
// mercatorLat -> y mercatorLon -> x
mercator_decrypt : function(mercatorLat, mercatorLon) {
var x = mercatorLon / 20037508.34 * 180.;
var y = mercatorLat / 20037508.34 * 180.;
y = 180 / this.PI * (2 * Math.atan(Math.exp(y * this.PI / 180.)) - this.PI / 2);
return {"lat" : y, "lon" : x};
/*
if (Math.abs(mercatorLon) < 180 && Math.abs(mercatorLat) < 90)
return null;
if ((Math.abs(mercatorLon) > 20037508.3427892) || (Math.abs(mercatorLat) > 20037508.3427892))
return null;
var a = mercatorLon / 6378137.0 * 57.295779513082323;
var x = a - (Math.floor(((a + 180.0) / 360.0)) * 360.0);
var y = (1.5707963267948966 - (2.0 * Math.atan(Math.exp((-1.0 * mercatorLat) / 6378137.0)))) * 57.295779513082323;
return {"lat" : y, "lon" : x};
//*/
},
// two point"s distance
distance : function (latA, lonA, latB, lonB) {
var earthR = 6371000.;
var x = Math.cos(latA * this.PI / 180.) * Math.cos(latB * this.PI / 180.) * Math.cos((lonA - lonB) * this.PI / 180);
var y = Math.sin(latA * this.PI / 180.) * Math.sin(latB * this.PI / 180.);
var s = x + y;
if (s > 1) s = 1;
if (s < -1) s = -1;
var alpha = Math.acos(s);
var distance = alpha * earthR;
return distance;
},
rectangle: function(lng1, lat1, lng2, lat2) {
return {
west : Math.min(lng1, lng2),
north : Math.max(lat1, lat2),
east : Math.max(lng1, lng2),
south : Math.min(lat1, lat2)
};
},
isInRect: function(rect, lon, lat) {
return rect.west <= lon && rect.east >= lon && rect.north >= lat && rect.south <= lat;
},
isInChina:function(lat, lon) {
//China region - raw data
//http://www.cnblogs.com/Aimeast/archive/2012/08/09/2629614.html
var region = [
this.rectangle(79.446200, 49.220400, 96.330000,42.889900),
this.rectangle(109.687200, 54.141500, 135.000200, 39.374200),
this.rectangle(73.124600, 42.889900, 124.143255, 29.529700),
this.rectangle(82.968400, 29.529700, 97.035200, 26.718600),
this.rectangle(97.025300, 29.529700, 124.367395, 20.414096),
this.rectangle(107.975793, 20.414096, 111.744104, 17.871542)
];
//China excluded region - raw data
var exclude = [
this.rectangle(119.921265, 25.398623, 122.497559, 21.785006),
this.rectangle(101.865200, 22.284000, 106.665000, 20.098800),
this.rectangle(106.452500, 21.542200, 108.051000, 20.487800),
this.rectangle(109.032300, 55.817500, 119.127000, 50.325700),
this.rectangle(127.456800, 55.817500, 137.022700, 49.557400),
this.rectangle(131.266200, 44.892200, 137.022700, 42.569200)
];
for (var i = 0; i < region.length; i++)
if (this.isInRect(region[i], lon, lat))
{
for (var j = 0; j < exclude.length; j++)
if (this.isInRect(exclude[j], lon, lat))
return false;
return true;
}
return false;
},
outOfChina : function (lat, lon) {
if (lon < 72.004 || lon > 137.8347)
return true;
if (lat < 0.8293 || lat > 55.8271)
return true;
return false;
},
transformLat : function (x, y) {
var ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
ret += (20.0 * Math.sin(6.0 * x * this.PI) + 20.0 * Math.sin(2.0 * x * this.PI)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(y * this.PI) + 40.0 * Math.sin(y / 3.0 * this.PI)) * 2.0 / 3.0;
ret += (160.0 * Math.sin(y / 12.0 * this.PI) + 320 * Math.sin(y * this.PI / 30.0)) * 2.0 / 3.0;
return ret;
},
transformLon : function (x, y) {
var ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
ret += (20.0 * Math.sin(6.0 * x * this.PI) + 20.0 * Math.sin(2.0 * x * this.PI)) * 2.0 / 3.0;
ret += (20.0 * Math.sin(x * this.PI) + 40.0 * Math.sin(x / 3.0 * this.PI)) * 2.0 / 3.0;
ret += (150.0 * Math.sin(x / 12.0 * this.PI) + 300.0 * Math.sin(x / 30.0 * this.PI)) * 2.0 / 3.0;
return ret;
}
};
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摘要：转换的结果和百度提供的接口精确到小数点后位请放心使用卫星椭球坐标投影到平面地图坐标系的投影因子。 WGS-84：是国际标准，GPS坐标（Google Earth使用、或者GPS模块） GCJ-02：中国坐标偏移标准，Google Map、高德、腾讯使用 BD-09：百度坐标偏移标准，Baidu Map使用 WGS-84 to GCJ-02 GPS.gcj_encrypt(); GC...
摘要：高德和在国内都是使用坐标系或在此基础上面加密为直接的坐标系，可以说，是国内最广泛使用的坐标系百度坐标系，百度坐标系是在坐标系的基础上再次加密偏移后形成的坐标系，只适用于百度地图。 概述 一：在进行地图开发过程中，我们一般能接触到以下三种类型的地图坐标系： 1.WGS－84原始坐标系，一般用国际GPS纪录仪记录下来的经纬度，通过GPS定位拿到的原始经纬度，Google和高德地图定位的的经...
摘要：前提了解坐标系分类经纬度美国，国际通用，如谷歌国外地图地图火星系国测局制定的标准，国内地图必须至少使用此对位置进行首次加密，高德地图腾讯搜搜地图阿里云地图灵图地图谷歌中国地图百度在标准基础上进行二次加密，百度地图这两天一直在研究经纬度 前提了解： 坐标系分类(经纬度)： WGS84 美国GPS，国际通用，如谷歌国外地图、osm地图 火星系GCJ-02 国测局制定的标准，国内地图必须至少...
摘要：做过地图相关开发的同学肯定会遇到这样一个问题同样的经纬度坐标，在百度地图和高德地图上位置不一样。解决方案百度地图以及高德地图都提供了一些方法来转换不同坐标系下的坐标，但是它们都需要进行网络请求，性能很差。 做过地图相关开发的同学肯定会遇到这样一个问题：同样的经纬度坐标，在百度地图和高德地图上位置不一样。showImg(https://segmentfault.com/img/remot...
摘要：实际中我们可能会用到不同的地图，那么就对应到不同坐标系的转换，比如说，你有一份的数据服务，你要展现在百度或者高德地图上，这时候你就需要转换了。 地图坐标转换 LBS，基于位置的服务（Location Based Service)，近年来已经无处不在，尤其是我们前端，相信或多或少都有接触一些地图API服务，比如高德、百度啊、谷歌啊~但是用的时候可能看到下面这些字眼：比如BD09、火星坐标...
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