GPS坐標(biāo)互轉(zhuǎn)：WGS-84(GPS)、GCJ-02(Google地圖)、BD-09(百度地圖)

WGS-84：是國(guó)際標(biāo)準(zhǔn)，GPS坐標(biāo)（Google Earth使用、或者GPS模塊）
GCJ-02：中國(guó)坐標(biāo)偏移標(biāo)準(zhǔn)，Google Map、高德、騰訊使用
BD-09：百度坐標(biāo)偏移標(biāo)準(zhǔn)，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 精確(二分極限法)
// var threshold = 0.000000001; 目前設(shè)置的是精確到小數(shù)點(diǎn)后9位，這個(gè)值越小，越精確，但是javascript中，浮點(diǎn)運(yùn)算本身就不太精確，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();

//求距離
GPS.distance();

示例：
document.write(“GPS: 39.933676862706776,116.35608315379092”);
var arr2 = GPS.gcj_encrypt(39.933676862706776, 116.35608315379092);
document.write(“中國(guó):” + 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（目前是小數(shù)點(diǎn)后9位相等）’);

本算法 gcj算法、bd算法都非常精確，已經(jīng)測(cè)試通過(guò)。
（BD轉(zhuǎn)換的結(jié)果和百度提供的接口精確到小數(shù)點(diǎn)后4位）
請(qǐng)放心使用

[代碼][JavaScript]代碼

var GPS = {
PI : 3.14159265358979324,
x_pi : 3.14159265358979324 * 3000.0 / 180.0,
delta : function (lat, lng) {
// 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: 衛(wèi)星橢球坐標(biāo)投影到平面地圖坐標(biāo)系的投影因子。
var ee = 0.00669342162296594323; // ee: 橢球的偏心率。
var dLat = this.transformLat(lng - 105.0, lat - 35.0);
var dLng = this.transformLng(lng - 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);
dLng = (dLng * 180.0) / (a / sqrtMagic * Math.cos(radLat) * this.PI);
return {‘lat’: dLat, ‘lng’: dLng};
},

//WGS-84 to GCJ-02 gcj_encrypt : function (wgsLat, wgsLng) {if (this.outOfChina(wgsLat, wgsLng))return {'lat': wgsLat, 'lng': wgsLng};var d = this.delta(wgsLat, wgsLng);return {'lat' : Number(wgsLat) + Number(d.lat),'lng' : Number(wgsLng) + Number(d.lng)}; }, //GCJ-02 to WGS-84 gcj_decrypt : function (gcjLat, gcjLng) {if (this.outOfChina(gcjLat, gcjLng))return {'lat': gcjLat, 'lng': gcjLng};var d = this.delta(gcjLat, gcjLng);return {'lat': Number(gcjLat) - Number(d.lat), 'lng': Number(gcjLng) - Number(d.lng)}; }, //GCJ-02 to WGS-84 exactly gcj_decrypt_exact : function (gcjLat, gcjLng) {var initDelta = 0.01;var threshold = 0.000000001;var dLat = initDelta, dLng = initDelta;var mLat = gcjLat - dLat, mLng = gcjLng - dLng;var pLat = gcjLat + dLat, pLng = gcjLng + dLng;var wgsLat, wgsLng, i = 0;while (1) {wgsLat = (mLat + pLat) / 2;wgsLng = (mLng + pLng) / 2;var tmp = this.gcj_encrypt(wgsLat, wgsLng)dLat = tmp.lat - gcjLat;dLng = tmp.lng - gcjLng;if ((Math.abs(dLat) < threshold) && (Math.abs(dLng) < threshold))break;if (dLat > 0) pLat = wgsLat; else mLat = wgsLat;if (dLng > 0) pLng = wgsLng; else mLng = wgsLng;if (++i > 10000) break;}//console.log(i);return {'lat': wgsLat, 'lng': wgsLng}; }, //GCJ-02 to BD-09 bd_encrypt : function (gcjLat, gcjLng) {var x = gcjLng, 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); bdLng = z * Math.cos(theta) + 0.0065; bdLat = z * Math.sin(theta) + 0.006; return {'lat' : bdLat,'lng' : bdLng}; }, //BD-09 to GCJ-02 bd_decrypt : function (bdLat, bdLng) {var x = bdLng - 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 gcjLng = z * Math.cos(theta); var gcjLat = z * Math.sin(theta);return {'lat' : gcjLat, 'lng' : gcjLng}; }, //WGS-84 to Web mercator //mercatorLat -> y mercatorLng -> x mercator_encrypt : function(wgsLat, wgsLng) {var x = wgsLng * 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, 'lng' : x};/*if ((Math.abs(wgsLng) > 180 || Math.abs(wgsLat) > 90))return null;var x = 6378137.0 * wgsLng * 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, 'lng' : x};//*/ }, // Web mercator to WGS-84 // mercatorLat -> y mercatorLng -> x mercator_decrypt : function(mercatorLat, mercatorLng) {var x = mercatorLng / 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, 'lng' : x};/*if (Math.abs(mercatorLng) < 180 && Math.abs(mercatorLat) < 90)return null;if ((Math.abs(mercatorLng) > 20037508.3427892) || (Math.abs(mercatorLat) > 20037508.3427892))return null;var a = mercatorLng / 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, 'lng' : x};//*/ }, // two point's distance distance : function (latA, lngA, latB, lngB) {var earthR = 6371000.;var x = Math.cos(latA * this.PI / 180.) * Math.cos(latB * this.PI / 180.) * Math.cos((lngA - lngB) * 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, lng) {if (lng < 72.004 || lng > 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; }, transformLng : 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; }

};

整理后的版本
/**

• 經(jīng)緯度轉(zhuǎn)換
  /
  export default {
  PI: 3.14159265358979324,
  x_pi: (3.14159265358979324 * 3000.0) / 180.0,
  delta: function(lat, lng) {
  // 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: 衛(wèi)星橢球坐標(biāo)投影到平面地圖坐標(biāo)系的投影因子。
  var ee = 0.00669342162296594323; // ee: 橢球的偏心率。
  var dLat = this.transformLat(lng - 105.0, lat - 35.0);
  var dLng = this.transformLng(lng - 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);
  dLng = (dLng * 180.0) / ((a / sqrtMagic) * Math.cos(radLat) * this.PI);
  return { lat: dLat, lng: dLng };
  },
  /*

  • WGS-84 to GCJ-02 GPS坐標(biāo)轉(zhuǎn)中國(guó)坐標(biāo)

  • @param {number} wgsLat GPS緯度

  • @param {number} wgsLng GPS經(jīng)度

  • @return {object} 返回中國(guó)坐標(biāo)經(jīng)緯度對(duì)象
    /
    GPSToChina: function(wgsLat, wgsLng) {
    if (this.outOfChina(wgsLat, wgsLng)) return { lat: wgsLat, lng: wgsLng };
    var d = this.delta(wgsLat, wgsLng);
    return { lat: Number(wgsLat) + Number(d.lat), lng: Number(wgsLng) + Number(d.lng) };
    },
    /*

  • GCJ-02 to WGS-84 中國(guó)標(biāo)準(zhǔn)坐標(biāo)轉(zhuǎn)GPS坐標(biāo)

  • @param {number} gcjLat 中國(guó)標(biāo)準(zhǔn)坐標(biāo)緯度

  • @param {number} gcjLng 中國(guó)標(biāo)準(zhǔn)坐標(biāo)經(jīng)度

  • @return {object} 返回GPS經(jīng)緯度對(duì)象
    /
    chinaToGPS: function(gcjLat, gcjLng) {
    if (this.outOfChina(gcjLat, gcjLng)) return { lat: gcjLat, lng: gcjLng };
    var d = this.delta(gcjLat, gcjLng);
    return { lat: Number(gcjLat) - Number(d.lat), lng: Number(gcjLng) - Number(d.lng) };
    },
    /*

  • GCJ-02 to WGS-84 exactly 中國(guó)標(biāo)準(zhǔn)坐標(biāo)轉(zhuǎn)GPS坐標(biāo)(精確)

  • @param {number} gcjLat 中國(guó)標(biāo)準(zhǔn)坐標(biāo)緯度

  • @param {number} gcjLng 中國(guó)標(biāo)準(zhǔn)坐標(biāo)經(jīng)度

  • @return {object} 返回GPS經(jīng)緯度對(duì)象(精確)
    */
    chinaToGPSExact: function(gcjLat, gcjLng) {
    var initDelta = 0.01;
    var threshold = 0.000000001;
    var dLat = initDelta,
    dLng = initDelta;
    var mLat = gcjLat - dLat,
    mLng = gcjLng - dLng;
    var pLat = gcjLat + dLat,
    pLng = gcjLng + dLng;
    var wgsLat,
    wgsLng,
    i = 0;
    while (1) {
    wgsLat = (mLat + pLat) / 2;
    wgsLng = (mLng + pLng) / 2;
    var tmp = this.gcj_encrypt(wgsLat, wgsLng);
    dLat = tmp.lat - gcjLat;
    dLng = tmp.lng - gcjLng;
    if (Math.abs(dLat) < threshold && Math.abs(dLng) < threshold) break;

    if (dLat > 0) pLat = wgsLat;else mLat = wgsLat;if (dLng > 0) pLng = wgsLng;else mLng = wgsLng;if (++i > 10000) break;

    }
    //console.log(i);
    return { lat: wgsLat, lng: wgsLng };
    },
    /**

  • GCJ-02 to BD-09 中國(guó)標(biāo)準(zhǔn)坐標(biāo)轉(zhuǎn)百度坐標(biāo)(精確)

  • @param {number} gcjLat 中國(guó)標(biāo)準(zhǔn)坐標(biāo)緯度

  • @param {number} gcjLng 中國(guó)標(biāo)準(zhǔn)坐標(biāo)經(jīng)度

  • @return {object} 返回百度經(jīng)緯度對(duì)象
    /
    chinaToBaidu: function(gcjLat, gcjLng) {
    var x = gcjLng,
    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);
    var bdLng = z * Math.cos(theta) + 0.0065;
    var bdLat = z * Math.sin(theta) + 0.006;
    return { lat: bdLat, lng: bdLng };
    },
    /*

  • BD-09 to GCJ-02 百度坐標(biāo)轉(zhuǎn)中國(guó)標(biāo)準(zhǔn)坐標(biāo)

  • @param {number} bdLat 百度坐標(biāo)緯度

  • @param {number} bdLng 百度坐標(biāo)經(jīng)度

  • @return {object} 返回中國(guó)標(biāo)準(zhǔn)經(jīng)緯度對(duì)象
    /
    baiduToChina: function(bdLat, bdLng) {
    var x = bdLng - 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 gcjLng = z * Math.cos(theta);
    var gcjLat = z * Math.sin(theta);
    return { lat: gcjLat, lng: gcjLng };
    },
    /*

  • BD-09 to GCJ-02 百度坐標(biāo)轉(zhuǎn)gps坐標(biāo)

  • @param {number} bdLat 百度坐標(biāo)緯度

  • @param {number} bdLng 百度坐標(biāo)經(jīng)度

  • @return {object} 返回gps經(jīng)緯度對(duì)象
    /
    baiduToGPS: function(bdLat, bdLng) {
    let china = this.baiduToChina(bdLat, bdLng);
    return this.chinaToGPS(china.lat, china.lng);
    },
    /*

  • WGS-84 to to BD-09 GPS坐標(biāo)轉(zhuǎn)Baidu坐標(biāo)

  • @param {number} gpsLat GPS緯度

  • @param {number} gpsLng GPS經(jīng)度

  • @return {object} 返回百度經(jīng)緯度對(duì)象
    /
    GPSToBaidu: function(gpsLat, gpsLng) {
    var china = this.GPSToChina(gpsLat, gpsLng);
    return this.chinaToBaidu(china.lat, china.lng);
    },
    /*

  • WGS-84 to Web mercator GPS坐標(biāo)轉(zhuǎn)墨卡托坐標(biāo)

  • @param {number} wgsLat GPS緯度

  • @param {number} wgsLng GPS經(jīng)度

  • @return {object} 返回墨卡托經(jīng)緯度對(duì)象
    /
    GPSToMercator: function(wgsLat, wgsLng) {
    var x = (wgsLng * 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, lng: x };
    /
    if ((Math.abs(wgsLng) > 180 || Math.abs(wgsLat) > 90))
    return null;
    var x = 6378137.0 * wgsLng * 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, ‘lng’ : x};
    //*/
    },
    /**

  • Web mercator to WGS-84 墨卡托坐標(biāo)轉(zhuǎn)GPS坐標(biāo)

  • @param {number} mercatorLat 墨卡托緯度

  • @param {number} mercatorLng 墨卡托經(jīng)度

  • @return {object} 返回GPS經(jīng)緯度對(duì)象
    /
    mercatorToGPS: function(mercatorLat, mercatorLng) {
    var x = (mercatorLng / 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, lng: x };
    /
    if (Math.abs(mercatorLng) < 180 && Math.abs(mercatorLat) < 90)
    return null;
    if ((Math.abs(mercatorLng) > 20037508.3427892) || (Math.abs(mercatorLat) > 20037508.3427892))
    return null;
    var a = mercatorLng / 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, ‘lng’ : x};
    //*/
    },
    /**

  • 兩點(diǎn)之間的距離

  • @param {number} latA 起點(diǎn)緯度

  • @param {number} lngA 起點(diǎn)經(jīng)度

  • @param {number} latB 終點(diǎn)緯度

  • @param {number} lngB 終點(diǎn)經(jīng)度

  • @return {number} 返回距離(米)
    /
    distance: function(latA, lngA, latB, lngB) {
    var earthR = 6371000;
    var x = Math.cos((latA * this.PI) / 180) * Math.cos((latB * this.PI) / 180) * Math.cos(((lngA - lngB) * 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;
    },
    /*

  • 是否在中國(guó)之外

  • @param {number} lat 緯度

  • @param {number} lng 經(jīng)度

  • @return {boolean]} 返回結(jié)果真或假
    */
    outOfChina: function(lat, lng) {
    if (lng < 72.004 || lng > 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;
    },
    transformLng: 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;
    }
    };

[代碼][PHP]代碼

<?php class 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: 衛(wèi)星橢球坐標(biāo)投影到平面地圖坐標(biāo)系的投影因子。 $ee = 0.00669342162296594323;// ee: 橢球的偏心率。 $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; } }

總結(jié)

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