GPS坐标转换成百度坐标及方法共享.doc

WGS坐标系是国际通用的一种地心坐标系，WGS本身也有多个版本（不赘述了），GCJ-02是国内官方采用的一种坐标系，国内许多坐标系也是基于GCJ-02变种而来的，比如百度坐标系BD-09。就这么简单介绍一下吧，坐标系本身的算法是比较复杂的，需要了解空间地理知识，百度文库里面也有一些坐标纠偏转换算法的相关论文，有兴趣的可以自己去研究。上代码：1. static double pi = 3.14159265358979324;2. static double a = 6378245.0;3. static double ee = 0.00669342162296594323;4. public final static double x_pi = 3.14159265358979324 * 3000.0 / 180.0;5.6. public static double wgs2bd(double lat, double lon) 7. double wgs2gcj = wgs2gcj(lat, lon);8. double gcj2bd = gcj2bd(wgs2gcj0, wgs2gcj1);9. return gcj2bd;10. 11.12. public static double gcj2bd(double lat, double lon) 13. double x = lon, y = lat;14. double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);15. double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);16. double bd_lon = z * Math.cos(theta) + 0.0065;17. double bd_lat = z * Math.sin(theta) + 0.006;18. return new double bd_lat, bd_lon ;19. 20.21. public static double bd2gcj(double lat, double lon) 22. double x = lon - 0.0065, y = lat - 0.006;23. double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi);24. double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi);25. double gg_lon = z * Math.cos(theta);26. double gg_lat = z * Math.sin(theta);27. return new double gg_lat, gg_lon ;28. 29.30. public static double wgs2gcj(double lat, double lon) 31. double dLat = transformLat(lon - 105.0, lat - 35.0);32. double dLon = transformLon(lon - 105.0, lat - 35.0);33. double radLat = lat / 180.0 * pi;34. double magic = Math.sin(radLat);35. magic = 1 - ee * magic * magic;36. double sqrtMagic = Math.sqrt(magic);37. dLat = (dLat * 180.0) / (a * (1 - ee) / (magic * sqrtMagic) * pi);38. dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);39. double mgLat = lat + dLat;40. double mgLon = lon + dLon;41. double loc = mgLat, mgLon ;42. return loc;43. 44.45. private static double transformLat(double lat, double lon) 46. double ret = -100.0 + 2.0 * lat + 3.0 * lon + 0.2 * lon * lon + 0.1 * lat * lon + 0.2 * Math.sqrt(Math.abs(lat);47. ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi) * 2.0 / 3.0;48. ret += (20.0 * Math.sin(lon * pi) + 40.0 * Math.sin(lon / 3.0 * pi) * 2.0 / 3.0;49. ret += (160.0 * Math.sin(lon / 12.0 * pi) + 320 * Math.sin(lon * pi/ 30.0) * 2.0 / 3.0;50. return ret;51. 52.53. private static double transformLon(double lat, double lon) 54. double ret = 300.0 + lat + 2.0 * lon + 0.1 * lat * lat + 0.1 * lat * lon + 0.1 * Math.sqrt(Math.abs(lat);55. ret += (20.0 * Math.sin(6.0 * lat * pi) + 20.0 * Math.sin(2.0 * lat * pi) * 2.0 / 3.0;56. ret += (20.0 * Math.sin(lat * pi) + 40.0 * Math.sin(lat / 3.0 * pi) * 2.0 / 3.0;57. ret += (150.0 * Math.sin(lat / 12.0 * pi) + 300.0 * Math.sin(lat / 30.0 * pi) * 2.0 / 3.0;58. return ret;59. 复制代码我提供的是JAVA代码，简单注释一下：pi: 圆周率。a: 卫星椭球坐标投影到平面地图坐标系的投影因子。ee: 椭球的偏心率。x_pi: 圆周率转换量。transformLat(lat, lon): 转换方法，比较