var GPS = {
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PI : 3.14159265358979324,
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x_pi : 3.14159265358979324 * 3000.0 / 180.0,
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delta : function (lat, lon) {
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// Krasovsky 1940
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//
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// a = 6378245.0, 1/f = 298.3
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// b = a * (1 - f)
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// ee = (a^2 - b^2) / a^2;
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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。
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var ee = 0.00669342162296594323; // ee: 椭球的偏心率。
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var dLat = this.transformLat(lon - 105.0, lat - 35.0);
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var dLon = this.transformLon(lon - 105.0, lat - 35.0);
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var radLat = lat / 180.0 * this.PI;
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var magic = Math.sin(radLat);
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magic = 1 - ee * magic * magic;
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var sqrtMagic = Math.sqrt(magic);
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dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * this.PI);
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dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * this.PI);
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return {'lat': dLat, 'lon': dLon};
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},
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//WGS-84 to GCJ-02
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gcj_encrypt : function (wgsLat, wgsLon) {
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if (this.outOfChina(wgsLat, wgsLon))
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return {'lat': wgsLat, 'lon': wgsLon};
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var d = this.delta(wgsLat, wgsLon);
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return {'lat' : wgsLat + d.lat,'lon' : wgsLon + d.lon};
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},
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//GCJ-02 to WGS-84
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gcj_decrypt : function (gcjLat, gcjLon) {
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if (this.outOfChina(gcjLat, gcjLon))
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return {'lat': gcjLat, 'lon': gcjLon};
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var d = this.delta(gcjLat, gcjLon);
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return {'lat': gcjLat - d.lat, 'lon': gcjLon - d.lon};
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},
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//GCJ-02 to WGS-84 exactly
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gcj_decrypt_exact : function (gcjLat, gcjLon) {
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var initDelta = 0.01;
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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;
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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;
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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;
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if (++i > 10000) break;
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}
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//console.log(i);
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return {'lat': wgsLat, 'lon': wgsLon};
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},
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//GCJ-02 to BD-09
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bd_encrypt : function (gcjLat, gcjLon) {
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var x = gcjLon, y = gcjLat;
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var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * this.x_pi);
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var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * this.x_pi);
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bdLon = z * Math.cos(theta) + 0.0065;
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bdLat = z * Math.sin(theta) + 0.006;
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return {'lat' : bdLat,'lon' : bdLon};
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},
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//BD-09 to GCJ-02
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bd_decrypt : function (bdLat, bdLon) {
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var x = bdLon - 0.0065, y = bdLat - 0.006;
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var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * this.x_pi);
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var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * this.x_pi);
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var gcjLon = z * Math.cos(theta);
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var gcjLat = z * Math.sin(theta);
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return {'lat' : gcjLat, 'lon' : gcjLon};
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},
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// WGS-84 to BD-09
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wgs2bd: function(lat, lon) {
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var point = this.gcj_encrypt(lat, lon);
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var bdPoint = this.bd_encrypt(point.lat, point.lon);
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return bdPoint;
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},
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// BD-09 to WGS-84
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bd2wgs: function(lat, lon) {
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var point = this.bd_decrypt(lat, lon);
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var wgsPoint = this.gcj_decrypt_exact(point.lat, point.lon);
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return wgsPoint;
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},
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//WGS-84 to Web mercator
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//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.);
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y = y * 20037508.34 / 180.;
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return {'lat' : y, 'lon' : x};
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/*
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if ((Math.abs(wgsLon) > 180 || Math.abs(wgsLat) > 90))
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return null;
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var x = 6378137.0 * wgsLon * 0.017453292519943295;
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var a = wgsLat * 0.017453292519943295;
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var y = 3189068.5 * Math.log((1.0 + Math.sin(a)) / (1.0 - Math.sin(a)));
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return {'lat' : y, 'lon' : x};
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//*/
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},
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// Web mercator to WGS-84
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// mercatorLat -> y mercatorLon -> x
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mercator_decrypt : function(mercatorLat, mercatorLon) {
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var x = mercatorLon / 20037508.34 * 180.;
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var y = mercatorLat / 20037508.34 * 180.;
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y = 180 / this.PI * (2 * Math.atan(Math.exp(y * this.PI / 180.)) - this.PI / 2);
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return {'lat' : y, 'lon' : x};
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/*
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if (Math.abs(mercatorLon) < 180 && Math.abs(mercatorLat) < 90)
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return null;
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if ((Math.abs(mercatorLon) > 20037508.3427892) || (Math.abs(mercatorLat) > 20037508.3427892))
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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;
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return {'lat' : y, 'lon' : x};
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//*/
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},
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// two point's distance
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distance : function (latA, lonA, latB, lonB) {
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var earthR = 6371000.;
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var x = Math.cos(latA * this.PI / 180.) * Math.cos(latB * this.PI / 180.) * Math.cos((lonA - lonB) * this.PI / 180);
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var y = Math.sin(latA * this.PI / 180.) * Math.sin(latB * this.PI / 180.);
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var s = x + y;
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if (s > 1) s = 1;
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if (s < -1) s = -1;
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var alpha = Math.acos(s);
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var distance = alpha * earthR;
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return distance;
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},
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outOfChina : function (lat, lon) {
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if (lon < 72.004 || lon > 137.8347)
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return true;
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if (lat < 0.8293 || lat > 55.8271)
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return true;
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return false;
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},
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transformLat : function (x, y) {
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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));
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ret += (20.0 * Math.sin(6.0 * x * this.PI) + 20.0 * Math.sin(2.0 * x * this.PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(y * this.PI) + 40.0 * Math.sin(y / 3.0 * this.PI)) * 2.0 / 3.0;
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ret += (160.0 * Math.sin(y / 12.0 * this.PI) + 320 * Math.sin(y * this.PI / 30.0)) * 2.0 / 3.0;
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return ret;
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},
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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));
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ret += (20.0 * Math.sin(6.0 * x * this.PI) + 20.0 * Math.sin(2.0 * x * this.PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(x * this.PI) + 40.0 * Math.sin(x / 3.0 * this.PI)) * 2.0 / 3.0;
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ret += (150.0 * Math.sin(x / 12.0 * this.PI) + 300.0 * Math.sin(x / 30.0 * this.PI)) * 2.0 / 3.0;
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return ret;
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}
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};
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var pi = 3.14159265358979324;
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var a = 6378245.0;
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var ee = 0.00669342162296594323;
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var x_pi = pi*3000.0/180.0;
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//
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function convertorPoint(lat, lon) {
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return gcj2bdR;
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}
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// 获取百度地图坐标
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function gcj2bd(lat,lon) {
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var x = lon, y = lat;
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var z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
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var theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
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var bd_lon = z * Math.cos(theta) + 0.0065;
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var bd_lat = z * Math.sin(theta) + 0.006;
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var result = [];
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result.push(bd_lat);
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result.push(bd_lon);
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return result;
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}
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function wgs2gcj(lat,lon) {
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var dLat = transformLat(lon - 105.0, lat - 35.0);
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var dLon = transformLon(lon - 105.0, lat - 35.0);
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var radLat = lat / 180.0 * pi;
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var magic = Math.sin(radLat);
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magic = 1 - ee * magic * magic;
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var sqrtMagic = Math.sqrt(magic);
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dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
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dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
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var mgLat = lat + dLat;
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var mgLon = lon + dLon;
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var result = [];
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result.push(mgLat);
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result.push(mgLon);
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return result;
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}
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function transformLat(lat,lon) {
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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));
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ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(lon * pi) + 40.0 * Math.sin(lon / 3.0 * pi)) * 2.0 / 3.0;
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ret += (160.0 * Math.sin(lon / 12.0 * pi) + 320 * Math.sin(lon * pi / 30.0)) * 2.0 / 3.0;
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return ret;
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}
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function transformLon(lat,lon) {
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var ret = 300.0 + lat + 2.0 * lon + 0.1 * lat * lat + 0.1 * lat * lon + 0.1 * Math.sqrt(Math.abs(lat));
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ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(lat * pi) + 40.0 * Math.sin(lat / 3.0 * pi)) * 2.0 / 3.0;
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ret += (150.0 * Math.sin(lat / 12.0 * pi) + 300.0 * Math.sin(lat / 30.0 * pi)) * 2.0 / 3.0;
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return ret;
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}
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