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();
//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<br />");
var arr2 = GPS.gcj_encrypt(39.933676862706776, 116.35608315379092);
document.write("中国:" + arr2['lat']+","+arr2['lon']+'<br />');
var arr3 = GPS.gcj_decrypt_exact(arr2['lat'], arr2['lon']);
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();
//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<br />");
var arr2 = GPS.gcj_encrypt(39.933676862706776, 116.35608315379092);
document.write("中国:" + arr2['lat']+","+arr2['lon']+'<br />');
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)');
1. [代码][JavaScript]代码
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)) return
{'lat': wgsLat,
'lon': wgsLon}; var
d = this.delta(wgsLat, wgsLon); return
{'lat'
: wgsLat + d.lat,'lon'
: wgsLon + d.lon}; }, //GCJ-02 to WGS-84 gcj_decrypt :
function (gcjLat, gcjLon) { 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; }, 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; }};
2. [代码][PHP]代码
<?phpclass
GPS { private
$PI = 3.14159265358979324; private
$x_pi = 0; public
function __construct() { $this->x_pi = 3.14159265358979324 * 3000.0 / 180.0; } //WGS-84 to GCJ-02 public
function gcj_encrypt($wgsLat,
$wgsLon) { if
($this->outOfChina($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)) 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
$distance; } private
function delta($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' => $dLon); } private
function outOfChina($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; }}转载自http://www.oschina.net/code/snippet_260395_39205
本文介绍了GPS坐标、中国坐标GCJ-02、百度坐标BD-09之间的转换方法及距离计算,提供了PHP和JavaScript代码实现。
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