GPS、谷歌、百度、高德坐标相互转换 GPSHelper.js
GPSHelper.js
var GPSHelper = { PI: 3.1415926535897932384626, x_pi: 3.1415926535897932384626, //* 3000.0 / 180.0, //转换BD09时偏移 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; }, //地心 转 WGS84 dx_wgs: function (value) { var _value = value.split('.'); var y; if (_value.length > 3) y = TimeToValue(_value[0], _value[1], _value[2] + '.' + (_value[3] ?? 0)); else y = TimeToValue(_value[0], _value[1], _value[2]); return y; function TimeToValue(Degrees, Minutes, Seconds) { var value = parseFloat(Degrees) + parseFloat(Minutes) / 60 + parseFloat(Seconds) / 3600; return parseFloat(value.toFixed(6)); } }, //WGS84 转 地心 wgs_dx: function (value) { if (value < 0) { value = -value; } var minute = (value - parseInt(value, 10)) * 60; var second = (minute - parseInt(minute, 10)) * 60; return parseInt(value, 10) + "." + parseInt(minute, 10) + "." + second.toFixed(3); }, /** * 批量转换 * @param {Array} 数组 * @param {string} 数组类型名称 * @example * 数组格式:[{lng,lat},{lng,lat}...] * 数组类型名称:地心坐标,WGS84,GCJ02,BD09 */ piliangzhuan: function (arr, typename) { var arr_dixin = []; //地心 var arr_w84 = []; //WGS84 var arr_gcj02 = []; //GCJ02 var arr_bd09 = []; //BD09 switch (typename) { case "地心坐标": $(arr).each(function (i, item) { arr_dixin.push(item.split(',')[0] + ',' + item.split(',')[1]); var lng = GPSHelper.dx_wgs(item.split(',')[0]); var lat = GPSHelper.dx_wgs(item.split(',')[1]); arr_w84.push(lng + ',' + lat); var gcj02 = GPSHelper.gcj_encrypt(lat, lng); arr_gcj02.push(gcj02.lon + ',' + gcj02.lat); var db09 = GPSHelper.bd_encrypt(gcj02.lat, gcj02.lon); arr_bd09.push(db09.lon + ',' + db09.lat); }); break; case "WGS84": $(arr).each(function (i, item) { var w84 = { lng: item.split(',')[0], lat: item.split(',')[1] }; arr_w84.push(w84.lng + ',' + w84.lat); arr_dixin.push(GPSHelper.wgs_dx(w84.lng) + ',' + GPSHelper.wgs_dx(w84.lat)); var gcj02 = GPSHelper.gcj_encrypt(w84.lat, w84.lng); arr_gcj02.push(gcj02.lon + ',' + gcj02.lat); var db09 = GPSHelper.bd_encrypt(gcj02.lat, gcj02.lng); arr_bd09.push(db09.lon + ',' + db09.lat); }); break; case "GCJ02": $(arr).each(function (i, item) { var gcj02 = { lng: item.split(',')[0], lat: item.split(',')[1] }; arr_gcj02.push(gcj02.lng + ',' + gcj02.lat); var w84 = GPSHelper.gcj_decrypt(gcj02.lat, gcj02.lng); arr_w84.push(w84.lon + ',' + w84.lat); arr_dixin.push(GPSHelper.wgs_dx(w84.lon) + ',' + GPSHelper.wgs_dx(w84.lat)); var db09 = GPSHelper.bd_encrypt(gcj02.lat, gcj02.lng); arr_bd09.push(db09.lon + ',' + db09.lat); }); break; case "BD09": $(arr).each(function (i, item) { arr_bd09.push(item.split(',')[0] + ',' + item.split(',')[1]); var gcj02 = GPSHelper.bd_decrypt(item.split(',')[1], item.split(',')[0]); arr_gcj02.push(gcj02.lon + ',' + gcj02.lat); var w84 = GPSHelper.gcj_decrypt(gcj02.lat, gcj02.lon); arr_w84.push(w84.lon + ',' + w84.lat); arr_dixin.push(GPSHelper.wgs_dx(w84.lon) + ',' + GPSHelper.wgs_dx(w84.lat)); }); break; default: break; } return { dx: arr_dixin, wgs84: arr_w84, gcj02: arr_gcj02, bd09: arr_bd09 }; } };
