Mars coordinates, Baidu coordinates, WGS84 coordinate conversion code (JS version)

/** * Provides the conversion between Baidu coordinates (BD09), National geodetic coordinates (MARS coordinates, GCJ02), and WGS84 coordinate system*///Define some constantsvarX_PI = 3.14159265358979324 * 3000.0/180.0;varPI = 3.1415926535897932384626;varA = 6378245.0;varEE = 0.00669342162296594323;/** * Baidu coordinate system (BD-09) and Mars coordinate system (GCJ-02) conversion * That is, Baidu to Google, German * @param bd_lon * @param bd_lat * @returns {*[]}*/functionbd09togcj02 (Bd_lon, Bd_lat) {varX_PI = 3.14159265358979324 * 3000.0/180.0; varx = bd_lon-0.0065; vary = bd_lat-0.006; varz = MATH.SQRT (x * x + y * y)-0.00002 * Math.sin (Y *x_pi); vartheta = math.atan2 (y, x)-0.000003 * MATH.COS (x *x_pi); varGG_LNG = Z *Math.Cos (theta); varGg_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 {*[]}*/functiongcj02tobd09 (LNG, LAT) {varz = MATH.SQRT (LNG * LNG + lat * lat) + 0.00002 * Math.sin (LAT *x_pi); vartheta = math.atan2 (lat, LNG) + 0.000003 * MATH.COS (LNG *x_pi); varBD_LNG = Z * Math.Cos (theta) + 0.0065; varBd_lat = Z * Math.sin (theta) + 0.006; return[BD_LNG, Bd_lat]}/** * WGS84 to GCJ02 * @param LNG * @param lat * @returns {*[]}*/functionwgs84togcj02 (LNG, LAT) {if(Out_of_china (LNG, LAT)) {return[LNG, LAT]}Else {        varDlat = Transformlat (lng-105.0, lat-35.0); varDLNG = TRANSFORMLNG (lng-105.0, lat-35.0); varRadlat = lat/180.0 *PI; varMagic =Math.sin (Radlat); Magic= 1-ee * Magic *Magic; varSqrtmagic =math.sqrt (Magic); Dlat= (Dlat * 180.0)/((A * (1-ee))/(Magic * sqrtmagic) *PI); DLNG= (DLNG * 180.0)/(A/sqrtmagic * MATH.COS (Radlat) *PI); varMglat = Lat +Dlat; varMGLNG = LNG +dlng; return[MGLNG, Mglat]}}/** * GCJ02 converted to WGS84 * @param LNG * @param lat * @returns {*[]}*/functiongcj02towgs84 (LNG, LAT) {if(Out_of_china (LNG, LAT)) {return[LNG, LAT]}Else {        varDlat = Transformlat (lng-105.0, lat-35.0); varDLNG = TRANSFORMLNG (lng-105.0, lat-35.0); varRadlat = lat/180.0 *PI; varMagic =Math.sin (Radlat); Magic= 1-ee * Magic *Magic; varSqrtmagic =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]}}functionTransformlat (LNG, LAT) {varRET = -100.0 + 2.0 * LNG + 3.0 * LAT + 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; returnret}functiontransformlng (LNG, LAT) {varRET = 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; returnret}/** * To determine whether in the domestic, not in the country do not offset * @param LNG * @param lat * @returns {Boolean}*/functionOut_of_china (LNG, LAT) {return(LNG < 72.004 | | LNG > 137.8347) | | (Lat < 0.8293 | | | lat > 55.8271) | |false);}

Mars coordinates, Baidu coordinates, WGS84 coordinate conversion code (JS version)