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  • 坐标系

    wgs84 --GPS系统直接通过卫星定位获得的坐标.(最基础的坐标.)
    gcj02 --兲朝已安全原因为由,要求在中国使用的地图产品使用的都必须是加密后的坐标.这套加密后的坐标就是gcj02 google的中国地图.高德地图. 他们为中国市场的产品都是用这套坐标.
    bd09ll 百度又在gcj02的技术上将坐标加密就成了 bd09ll坐标.
    总而言之  用这些地图厂家提供的产品和api得到的坐标都不是真正的坐标(不是wgs84坐标).
    wgs84转gcj02的算法在网上可以找到, 但是完善的逆转算法目前还没有.

    bd09ll坐标能再百度地图上正确显示, 如果你用百度地图的api搞开发, 就设置此参数.

    需要说的是 摩卡托坐标 是一种投影坐标,  它不是用经纬度来表示的.  它多用于航海图 航空图.

    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）');

    标签： jQuery GPS PHP

    代码片段(2) [全屏查看所有代码]

    1. [代码][JavaScript]代码    

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    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     跳至 [1] [2] [全屏预览]

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    <?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: 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;
        }
    }
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  • 原文地址：https://www.cnblogs.com/kabi/p/5166091.html
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