Conversion between Baidu coordinates (BD09), geodetic coordinates (MARS coordinates, GCJ02), and WGS84 coordinate system (JS version code)

/** * Created by Wandergis on 2015/7/8. * provided Baidu coordinates (BD09), geodetic coordinates (MARS coordinates, GCJ02), and WGS84 coordinate system between the conversion *///define some constants var X_pi = 3.14159265358979324 * 3000.0/180.0;var PI = 3.1415 926535897932384626;var a = 6378245.0;var ee = 0.00669342162296594323;/** * Baidu coordinate system (BD-09) and Mars coordinate system (GCJ-02) conversion * That is, Baidu to Google, high De * @param bd_lon * @param bd_lat * @returns {*[]} */function bd09togcj02 (Bd_lon, Bd_lat) {var x_pi = 3.14159265358979    324 * 3000.0/180.0;    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 * x_pi);    var theta = math.atan2 (y, x)-0.000003 * MATH.COS (x * x_pi);    var gg_lng = z * Math.Cos (theta);    var Gg_lat = z * Math.sin (theta); return [GG_LNG, gg_lat]}/** * Mars coordinate system (GCJ-02) and Baidu coordinate system (BD-09) conversion * That is, Google, High German to Baidu * @param LNG * @param lat * @returns {*[]} *    /function gcj02tobd09 (LNG, lat) {var z = math.sqrt (LNG * LNG + lat * lat) + 0.00002 * Math.sin (LAT * x_pi);   var theta = math.atan2 (lat, LNG) + 0.000003 * Math.Cos (LNG * x_pi); var bd_lng = z * Math.Cos (theta) + 0.0065;    var Bd_lat = z * Math.sin (theta) + 0.006;    return [BD_LNG, bd_lat]}/** * WGS84 turn GCj02 * @param LNG * @param lat * @returns {*[]} */function wgs84togcj02 (LNG, LAT) { if (Out_of_china (LNG, LAT)) {return [LNG, LAT]} else {var Dlat = Transformlat (lng-105.0, Lat-        35.0);        var dlng = transformlng (lng-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);        DLNG = (DLNG * 180.0)/(A/sqrtmagic * MATH.COS (Radlat) * PI);        var Mglat = lat + Dlat;        var mglng = lng + dlng; return [MGLNG, Mglat]}}/** * GCJ02 convert to WGS84 * @param LNG * @param lat * @returns {*[]} */function gcj02towgs84 (LNG, L at) {if (Out_of_china (LNG, LAT)) {return [LNG, LAT]} else {var Dlat = transformLat (lng-105.0, lat-35.0);        var dlng = transformlng (lng-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);        DLNG = (DLNG * 180.0)/(A/sqrtmagic * MATH.COS (Radlat) * PI);        Mglat = lat + Dlat;        MGLNG = LNG + dlng; return [LNG * 2-mglng, LAT * 2-mglat]}}function Transformlat (LNG, LAT) {var ret = -100.0 + 2.0 * LNG + 3.0 * L    at + 0.2 * lat * lat + 0.1 * LNG * LAT + 0.2 * MATH.SQRT (Math.Abs (LNG));    RET + = (20.0 * Math.sin (6.0 * LNG * pi) + 20.0 * Math.sin (2.0 * LNG * 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 + = (160.0 * Math.sin (lat/12.0 * PI) + * * Math.sin (LAT * pi/30.0)) * 2.0/3.0; Return ret}function transformlng (LNG, LAT) {var ret = 300.0 + LNG + 2.0 * LAT+ 0.1 * LNG * LNG + 0.1 * LNG * LAT + 0.1 * MATH.SQRT (Math.Abs (LNG));    RET + = (20.0 * Math.sin (6.0 * LNG * pi) + 20.0 * Math.sin (2.0 * LNG * pi)) * 2.0/3.0;    RET + = (20.0 * Math.sin (LNG * pi) + 40.0 * Math.sin (lng/3.0 * pi)) * 2.0/3.0;    RET + = (150.0 * Math.sin (lng/12.0 * pi) + 300.0 * Math.sin (lng/30.0 * pi)) * 2.0/3.0; Return ret}/** * Determine whether in the domestic, not in the domestic do not do the offset * @param LNG * @param lat * @returns {boolean} */function Out_of_china (LNG, LAT) {R Eturn (LNG < 72.004 | | LNG > 137.8347) | | (Lat < 0.8293 | | lat > 55.8271) | | false);}

　　

Conversion between Baidu coordinates (BD09), geodetic coordinates (MARS coordinates, GCJ02), and WGS84 coordinate system (JS version code)