火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法
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package com.hjb.util; import java.util.HashMap; import java.util.Map; public class BaiduMapstoAutoNaviMapUtils { static double pi = 3.14159265358979324; static double a = 6378245.0; static double ee = 0.00669342162296594323; static double x_pi = 3.14159265358979324 * 3000.0 / 180.0; // World Geodetic System ==> Mars Geodetic System public static Map<String, String> transform(double wgLat, double wgLon) { Map<String, String> resultMap = new HashMap<String, String>(); double mgLat = 0; double mgLon = 0; if (outOfChina(wgLat, wgLon)) { mgLat = wgLat; mgLon = wgLon; resultMap.put("mgLat", String.valueOf(mgLat)); resultMap.put("mgLon", String.valueOf(mgLon)); return resultMap; } double dLat = transformLat(wgLon - 105.0, wgLat - 35.0); double dLon = transformLon(wgLon - 105.0, wgLat - 35.0); double radLat = wgLat / 180.0 * pi; double magic = Math.sin(radLat); magic = 1 - ee * magic * magic; double sqrtMagic = Math.sqrt(magic); dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi); dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi); mgLat = wgLat + dLat; mgLon = wgLon + dLon; resultMap.put("mgLat", String.valueOf(mgLat)); resultMap.put("mgLon", String.valueOf(mgLon)); return resultMap; } static boolean outOfChina(double lat, double lon) { if (lon < 72.004 || lon > 137.8347) return true; if (lat < 0.8293 || lat > 55.8271) return true; return false; } static double transformLat(double x, double y) { double 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; } static double transformLon(double x, double y) { double 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; } /** * GCJ-02(火星坐标) 和 BD-09 (百度坐标) * bd_encrypt 将 GCJ-02 坐标转换成 BD-09 坐标, bd_decrypt 反之。 * @param bd_lat * @param bd_lon * @param gg_lat * @param gg_lon */ public static Map<String, String> bd_encrypt(double gg_lat, double gg_lon) { Map<String, String> resultMap = new HashMap<String,String>(); double bd_lat = 0; double bd_lon = 0; double x = gg_lon, y = gg_lat; double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi); double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi); bd_lon = z * Math.cos(theta) + 0.0065; bd_lat = z * Math.sin(theta) + 0.006; resultMap.put("mgLat", String.valueOf(bd_lat)); resultMap.put("mgLon", String.valueOf(bd_lon)); return resultMap; } /** * GCJ-02(火星坐标) 和 BD-09 (百度坐标) * bd_encrypt 将 GCJ-02 坐标转换成 BD-09 坐标, bd_decrypt 反之。 * @param bd_lat * @param bd_lon * @param gg_lat * @param gg_lon */ public static Map<String, String> bd_decrypt(double bd_lat, double bd_lon){ Map<String, String> resultMap = new HashMap<String,String>(); double gg_lat = 0; double gg_lon = 0; double x = bd_lon - 0.0065, y = bd_lat - 0.006; double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * x_pi); double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * x_pi); gg_lon = z * Math.cos(theta); gg_lat = z * Math.sin(theta); resultMap.put("mgLat", String.valueOf(gg_lat)); resultMap.put("mgLon", String.valueOf(gg_lon)); return resultMap; } }
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