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‘]);
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）‘);
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;
}
};
1 class GPS {
2 private $PI = 3.14159265358979324;
3 private $x_pi = 0;
4
5 public function __construct()
6 {
7 $this->x_pi = 3.14159265358979324 * 3000.0 / 180.0;
8 }
9 //WGS-84 to GCJ-02
10 public function gcj_encrypt($wgsLat, $wgsLon) {
11 if ($this->outOfChina($wgsLat, $wgsLon))
12 return array(‘lat‘ => $wgsLat, ‘lon‘ => $wgsLon);
13
14 $d = $this->delta($wgsLat, $wgsLon);
15 return array(‘lat‘ => $wgsLat + $d[‘lat‘],‘lon‘ => $wgsLon + $d[‘lon‘]);
16 }
17 //GCJ-02 to WGS-84
18 public function gcj_decrypt($gcjLat, $gcjLon) {
19 if ($this->outOfChina($gcjLat, $gcjLon))
20 return array(‘lat‘ => $gcjLat, ‘lon‘ => $gcjLon);
21
22 $d = $this->delta($gcjLat, $gcjLon);
23 return array(‘lat‘ => $gcjLat - $d[‘lat‘], ‘lon‘ => $gcjLon - $d[‘lon‘]);
24 }
25 //GCJ-02 to WGS-84 exactly
26 public function gcj_decrypt_exact($gcjLat, $gcjLon) {
27 $initDelta = 0.01;
28 $threshold = 0.000000001;
29 $dLat = $initDelta; $dLon = $initDelta;
30 $mLat = $gcjLat - $dLat; $mLon = $gcjLon - $dLon;
31 $pLat = $gcjLat + $dLat; $pLon = $gcjLon + $dLon;
32 $wgsLat = 0; $wgsLon = 0; $i = 0;
33 while (TRUE) {
34 $wgsLat = ($mLat + $pLat) / 2;
35 $wgsLon = ($mLon + $pLon) / 2;
36 $tmp = $this->gcj_encrypt($wgsLat, $wgsLon);
37 $dLat = $tmp[‘lat‘] - $gcjLat;
38 $dLon = $tmp[‘lon‘] - $gcjLon;
39 if ((abs($dLat) < $threshold) && (abs($dLon) < $threshold))
40 break;
41
42 if ($dLat > 0) $pLat = $wgsLat; else $mLat = $wgsLat;
43 if ($dLon > 0) $pLon = $wgsLon; else $mLon = $wgsLon;
44
45 if (++$i > 10000) break;
46 }
47 //console.log(i);
48 return array(‘lat‘ => $wgsLat, ‘lon‘=> $wgsLon);
49 }
50 //GCJ-02 to BD-09
51 public function bd_encrypt($gcjLat, $gcjLon) {
52 $x = $gcjLon; $y = $gcjLat;
53 $z = sqrt($x * $x + $y * $y) + 0.00002 * sin($y * $this->x_pi);
54 $theta = atan2($y, $x) + 0.000003 * cos($x * $this->x_pi);
55 $bdLon = $z * cos($theta) + 0.0065;
56 $bdLat = $z * sin($theta) + 0.006;
57 return array(‘lat‘ => $bdLat,‘lon‘ => $bdLon);
58 }
59 //BD-09 to GCJ-02
60 public function bd_decrypt($bdLat, $bdLon)
61 {
62 $x = $bdLon - 0.0065; $y = $bdLat - 0.006;
63 $z = sqrt($x * $x + $y * $y) - 0.00002 * sin($y * $this->x_pi);
64 $theta = atan2($y, $x) - 0.000003 * cos($x * $this->x_pi);
65 $$gcjLon = $z * cos($theta);
66 $gcjLat = $z * sin($theta);
67 return array(‘lat‘ => $gcjLat, ‘lon‘ => $gcjLon);
68 }
69 //WGS-84 to Web mercator
70 //$mercatorLat -> y $mercatorLon -> x
71 public function mercator_encrypt($wgsLat, $wgsLon)
72 {
73 $x = $wgsLon * 20037508.34 / 180.;
74 $y = log(tan((90. + $wgsLat) * $this->PI / 360.)) / ($this->PI / 180.);
75 $y = $y * 20037508.34 / 180.;
76 return array(‘lat‘ => $y, ‘lon‘ => $x);
77 /*
78 if ((abs($wgsLon) > 180 || abs($wgsLat) > 90))
79 return NULL;
80 $x = 6378137.0 * $wgsLon * 0.017453292519943295;
81 $a = $wgsLat * 0.017453292519943295;
82 $y = 3189068.5 * log((1.0 + sin($a)) / (1.0 - sin($a)));
83 return array(‘lat‘ => $y, ‘lon‘ => $x);
84 //*/
85 }
86 // Web mercator to WGS-84
87 // $mercatorLat -> y $mercatorLon -> x
88 public function mercator_decrypt($mercatorLat, $mercatorLon)
89 {
90 $x = $mercatorLon / 20037508.34 * 180.;
91 $y = $mercatorLat / 20037508.34 * 180.;
92 $y = 180 / $this->PI * (2 * atan(exp($y * $this->PI / 180.)) - $this->PI / 2);
93 return array(‘lat‘ => $y, ‘lon‘ => $x);
94 /*
95 if (abs($mercatorLon) < 180 && abs($mercatorLat) < 90)
96 return NULL;
97 if ((abs($mercatorLon) > 20037508.3427892) || (abs($mercatorLat) > 20037508.3427892))
98 return NULL;
99 $a = $mercatorLon / 6378137.0 * 57.295779513082323;
100 $x = $a - (floor((($a + 180.0) / 360.0)) * 360.0);
101 $y = (1.5707963267948966 - (2.0 * atan(exp((-1.0 * $mercatorLat) / 6378137.0)))) * 57.295779513082323;
102 return array(‘lat‘ => $y, ‘lon‘ => $x);
103 //*/
104 }
105 // two point‘s distance
106 public function distance($latA, $lonA, $latB, $lonB)
107 {
108 $earthR = 6371000.;
109 $x = cos($latA * $this->PI / 180.) * cos($latB * $this->PI / 180.) * cos(($lonA - $lonB) * $this->PI / 180);
110 $y = sin($latA * $this->PI / 180.) * sin($latB * $this->PI / 180.);
111 $s = $x + $y;
112 if ($s > 1) $s = 1;
113 if ($s < -1) $s = -1;
114 $alpha = acos($s);
115 $distance = $alpha * $earthR;
116 return $distance;
117 }
118
119 private function delta($lat, $lon)
120 {
121 // Krasovsky 1940
122 //
123 // a = 6378245.0, 1/f = 298.3
124 // b = a * (1 - f)
125 // ee = (a^2 - b^2) / a^2;
126 $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。
127 $ee = 0.00669342162296594323;// ee: 椭球的偏心率。
128 $dLat = $this->transformLat($lon - 105.0, $lat - 35.0);
129 $dLon = $this->transformLon($lon - 105.0, $lat - 35.0);
130 $radLat = $lat / 180.0 * $this->PI;
131 $magic = sin($radLat);
132 $magic = 1 - $ee * $magic * $magic;
133 $sqrtMagic = sqrt($magic);
134 $dLat = ($dLat * 180.0) / (($a * (1 - $ee)) / ($magic * $sqrtMagic) * $this->PI);
135 $dLon = ($dLon * 180.0) / ($a / $sqrtMagic * cos($radLat) * $this->PI);
136 return array(‘lat‘ => $dLat, ‘lon‘ => $dLon);
137 }
138
139 private function outOfChina($lat, $lon)
140 {
141 if ($lon < 72.004 || $lon > 137.8347)
142 return TRUE;
143 if ($lat < 0.8293 || $lat > 55.8271)
144 return TRUE;
145 return FALSE;
146 }
147
148 private function transformLat($x, $y) {
149 $ret = -100.0 + 2.0 * $x + 3.0 * $y + 0.2 * $y * $y + 0.1 * $x * $y + 0.2 * sqrt(abs($x));
150 $ret += (20.0 * sin(6.0 * $x * $this->PI) + 20.0 * sin(2.0 * $x * $this->PI)) * 2.0 / 3.0;
151 $ret += (20.0 * sin($y * $this->PI) + 40.0 * sin($y / 3.0 * $this->PI)) * 2.0 / 3.0;
152 $ret += (160.0 * sin($y / 12.0 * $this->PI) + 320 * sin($y * $this->PI / 30.0)) * 2.0 / 3.0;
153 return $ret;
154 }
155
156 private function transformLon($x, $y) {
157 $ret = 300.0 + $x + 2.0 * $y + 0.1 * $x * $x + 0.1 * $x * $y + 0.1 * sqrt(abs($x));
158 $ret += (20.0 * sin(6.0 * $x * $this->PI) + 20.0 * sin(2.0 * $x * $this->PI)) * 2.0 / 3.0;
159 $ret += (20.0 * sin($x * $this->PI) + 40.0 * sin($x / 3.0 * $this->PI)) * 2.0 / 3.0;
160 $ret += (150.0 * sin($x / 12.0 * $this->PI) + 300.0 * sin($x / 30.0 * $this->PI)) * 2.0 / 3.0;
161 return $ret;
162 }
163 }
时间： 2024-11-05 06:40:24