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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))
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| | | 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
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| | | gcj_decrypt : function (gcjLat, gcjLon) {
|
| | | if (this.outOfChina(gcjLat, gcjLon))
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| | | return {'lat': gcjLat, 'lon': gcjLon};
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| | | |
| | | 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;
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| | | var dLat = initDelta, dLon = initDelta;
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| | | var mLat = gcjLat - dLat, mLon = gcjLon - dLon;
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| | | var pLat = gcjLat + dLat, pLon = gcjLon + dLon;
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| | | var wgsLat, wgsLon, i = 0;
|
| | | while (1) {
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| | | wgsLat = (mLat + pLat) / 2;
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| | | wgsLon = (mLon + pLon) / 2;
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| | | var tmp = this.gcj_encrypt(wgsLat, wgsLon)
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| | | dLat = tmp.lat - gcjLat;
|
| | | dLon = tmp.lon - gcjLon;
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| | | if ((Math.abs(dLat) < threshold) && (Math.abs(dLon) < threshold))
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| | | break;
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| | | |
| | | if (dLat > 0) pLat = wgsLat; else mLat = wgsLat;
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| | | 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
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| | | bd_encrypt : function (gcjLat, gcjLon) {
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| | | 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) {
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| | | 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 BD-09
|
| | | wgs2bd: function(lat, lon) {
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| | | var point = this.gcj_encrypt(lat, lon);
|
| | | var bdPoint = this.bd_encrypt(point.lat, point.lon);
|
| | | return bdPoint;
|
| | | },
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| | | |
| | | // BD-09 to WGS-84
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| | | bd2wgs: function(lat, lon) {
|
| | | var point = this.bd_decrypt(lat, lon);
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| | | var wgsPoint = this.gcj_decrypt_exact(point.lat, point.lon);
|
| | | return wgsPoint;
|
| | | },
|
| | | |
| | | //WGS-84 to Web mercator
|
| | | //mercatorLat -> y mercatorLon -> x
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| | | mercator_encrypt : function(wgsLat, wgsLon) {
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| | | var x = wgsLon * 20037508.34 / 180.;
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| | | 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
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| | | 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};
|
| | | /*
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| | | if (Math.abs(mercatorLon) < 180 && Math.abs(mercatorLat) < 90)
|
| | | return null;
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| | | if ((Math.abs(mercatorLon) > 20037508.3427892) || (Math.abs(mercatorLat) > 20037508.3427892))
|
| | | return null;
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| | | var a = mercatorLon / 6378137.0 * 57.295779513082323;
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| | | var x = a - (Math.floor(((a + 180.0) / 360.0)) * 360.0);
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| | | 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.);
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| | | var s = x + y;
|
| | | if (s > 1) s = 1;
|
| | | if (s < -1) s = -1;
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| | | var alpha = Math.acos(s);
|
| | | var distance = alpha * earthR;
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| | | return distance;
|
| | | },
|
| | | outOfChina : function (lat, lon) {
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| | | 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) {
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| | | 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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| | | var pi = 3.14159265358979324;
|
| | | var a = 6378245.0;
|
| | | var ee = 0.00669342162296594323;
|
| | | var x_pi = pi*3000.0/180.0;
|
| | |
|
| | | // |
| | | function convertorPoint(lat, lon) {
|
| | | |
| | | |
| | | |
| | | return gcj2bdR;
|
| | | }
|
| | |
|
| | | // 获取百度地图坐标
|
| | | function gcj2bd(lat,lon) {
|
| | | var x = lon, y = lat;
|
| | | var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
|
| | | var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
|
| | | var bd_lon = z * Math.cos(theta) + 0.0065;
|
| | | var bd_lat = z * Math.sin(theta) + 0.006;
|
| | | var result = [];
|
| | | result.push(bd_lat);
|
| | | result.push(bd_lon);
|
| | | return result;
|
| | | }
|
| | |
|
| | | function wgs2gcj(lat,lon) {
|
| | | var dLat = transformLat(lon - 105.0, lat - 35.0);
|
| | | var dLon = transformLon(lon - 105.0, lat - 35.0);
|
| | | var radLat = lat / 180.0 * 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) * pi);
|
| | | dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
|
| | | var mgLat = lat + dLat;
|
| | | var mgLon = lon + dLon;
|
| | | var result = [];
|
| | | result.push(mgLat);
|
| | | result.push(mgLon);
|
| | | return result;
|
| | | }
|
| | |
|
| | | function transformLat(lat,lon) {
|
| | | var ret = -100.0 + 2.0 * lat + 3.0 * lon + 0.2 * lon * lon + 0.1 * lat * lon + 0.2 * Math.sqrt(Math.abs(lat));
|
| | | ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0;
|
| | | ret += (20.0 * Math.sin(lon * pi) + 40.0 * Math.sin(lon / 3.0 * pi)) * 2.0 / 3.0;
|
| | | ret += (160.0 * Math.sin(lon / 12.0 * pi) + 320 * Math.sin(lon * pi / 30.0)) * 2.0 / 3.0;
|
| | | return ret;
|
| | | }
|
| | |
|
| | | function transformLon(lat,lon) {
|
| | | var ret = 300.0 + lat + 2.0 * lon + 0.1 * lat * lat + 0.1 * lat * lon + 0.1 * Math.sqrt(Math.abs(lat));
|
| | | ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0;
|
| | | ret += (20.0 * Math.sin(lat * pi) + 40.0 * Math.sin(lat / 3.0 * pi)) * 2.0 / 3.0;
|
| | | ret += (150.0 * Math.sin(lat / 12.0 * pi) + 300.0 * Math.sin(lat / 30.0 * pi)) * 2.0 / 3.0;
|
| | | return ret;
|
| | | } |