/** * 百度经纬度转Gps经纬度 * @returns {*} {lat, lon} */ tools.baiduToGps = function (lat, lon) { //百度经纬度转Gps经纬度 var a = 6378245.0; var ee = 0.00669342162296594323; var pi = 3.1415926535897932384626;
function bd09_To_Gcj02(bd_lat, bd_lon) { var x = bd_lon - 0.0065; var y = bd_lat - 0.006; var z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * pi); var theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * pi); var gg_lon = z * Math.cos(theta); var gg_lat = z * Math.sin(theta); var Gcj02 = { lon: gg_lon, lat: gg_lat }
return Gcj02; }
function gcj_To_Gps84(gcj_lat, gcj_lon) { var gps = transform(gcj_lat, gcj_lon); var lontitude = gcj_lon * 2 - gps.lon; var latitude = gcj_lat * 2 - gps.lat; var Gps84 = { lon: lontitude, lat: latitude }
return Gps84; }
function transform(lat, lon) { if (outOfChina(lat, lon)) { var out_jw = { lat: lat, lon: lon }
return out_jw; } 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 transform_jw = { lat: mgLat, lon: mgLon }
return transform_jw; }
function outOfChina(lat, lon) { if (lon < 72.004 || lon > 137.8347) { return true; } if (lat < 0.8293 || lat > 55.8271) { return true; } return false; }
function transformLat(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 * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0; ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0; ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0; return ret; }
function transformLon(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 * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0; ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0; ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0; return ret; }
var gcj_lat_lon = bd09_To_Gcj02(lat, lon); return gcj_To_Gps84(gcj_lat_lon.lat, gcj_lat_lon.lon); }