1 /**
2 * 各地图API坐标系统比较与转换;
3 * WGS84坐标系：即地球坐标系，国际上通用的坐标系。设备一般包含GPS芯片或者北斗芯片获取的经纬度为WGS84地理坐标系,
4 * 谷歌地图采用的是WGS84地理坐标系（中国范围除外）;
5 * GCJ02坐标系：即火星坐标系，是由中国国家测绘局制订的地理信息系统的坐标系统。由WGS84坐标系经加密后的坐标系。
6 * 谷歌中国地图和搜搜中国地图采用的是GCJ02地理坐标系; BD09坐标系：即百度坐标系，GCJ02坐标系经加密后的坐标系;
7 * 搜狗坐标系、图吧坐标系等，估计也是在GCJ02基础上加密而成的。 chenhua
8 */
9 public class PositionUtil {
10
11 public static final String BAIDU_LBS_TYPE = "bd09ll";
12
13 public static double pi = 3.1415926535897932384626;
14 public static double a = 6378245.0;
15 public static double ee = 0.00669342162296594323;
16
17 /**
18 * 84 to 火星坐标系 (GCJ-02) World Geodetic System ==> Mars Geodetic System
19 *
20 * @param lat
21 * @param lon
22 * @return
23 */
24 public static Gps gps84_To_Gcj02(double lat, double lon) {
25 if (outOfChina(lat, lon)) {
26 return null;
27 }
28 double dLat = transformLat(lon - 105.0, lat - 35.0);
29 double dLon = transformLon(lon - 105.0, lat - 35.0);
30 double radLat = lat / 180.0 * pi;
31 double magic = Math.sin(radLat);
32 magic = 1 - ee * magic * magic;
33 double sqrtMagic = Math.sqrt(magic);
34 dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
35 dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
36 double mgLat = lat + dLat;
37 double mgLon = lon + dLon;
38 return new Gps(mgLat, mgLon);
39 }
40
41 /**
42 * * 火星坐标系 (GCJ-02) to 84 * * @param lon * @param lat * @return
43 * */
44 public static Gps gcj_To_Gps84(double lat, double lon) {
45 Gps gps = transform(lat, lon);
46 double lontitude = lon * 2 - gps.getWgLon();
47 double latitude = lat * 2 - gps.getWgLat();
48 return new Gps(latitude, lontitude);
49 }
50
51 /**
52 * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 将 GCJ-02 坐标转换成 BD-09 坐标
53 *
54 * @param gg_lat
55 * @param gg_lon
56 */
57 public static Gps gcj02_To_Bd09(double gg_lat, double gg_lon) {
58 double x = gg_lon, y = gg_lat;
59 double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * pi);
60 double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * pi);
61 double bd_lon = z * Math.cos(theta) + 0.0065;
62 double bd_lat = z * Math.sin(theta) + 0.006;
63 return new Gps(bd_lat, bd_lon);
64 }
65
66 /**
67 * * 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换算法 * * 将 BD-09 坐标转换成GCJ-02 坐标 * * @param
68 * bd_lat * @param bd_lon * @return
69 */
70 public static Gps bd09_To_Gcj02(double bd_lat, double bd_lon) {
71 double x = bd_lon - 0.0065, y = bd_lat - 0.006;
72 double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * pi);
73 double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * pi);
74 double gg_lon = z * Math.cos(theta);
75 double gg_lat = z * Math.sin(theta);
76 return new Gps(gg_lat, gg_lon);
77 }
78
79 /**
80 * (BD-09)-->84
81 * @param bd_lat
82 * @param bd_lon
83 * @return
84 */
85 public static Gps bd09_To_Gps84(double bd_lat, double bd_lon) {
86
87 Gps gcj02 = PositionUtil.bd09_To_Gcj02(bd_lat, bd_lon);
88 Gps map84 = PositionUtil.gcj_To_Gps84(gcj02.getWgLat(),
89 gcj02.getWgLon());
90 return map84;
91
92 }
93
94 public static boolean outOfChina(double lat, double lon) {
95 if (lon < 72.004 || lon > 137.8347)
96 return true;
97 if (lat < 0.8293 || lat > 55.8271)
98 return true;
99 return false;
100 }
101
102 public static Gps transform(double lat, double lon) {
103 if (outOfChina(lat, lon)) {
104 return new Gps(lat, lon);
105 }
106 double dLat = transformLat(lon - 105.0, lat - 35.0);
107 double dLon = transformLon(lon - 105.0, lat - 35.0);
108 double radLat = lat / 180.0 * pi;
109 double magic = Math.sin(radLat);
110 magic = 1 - ee * magic * magic;
111 double sqrtMagic = Math.sqrt(magic);
112 dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
113 dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
114 double mgLat = lat + dLat;
115 double mgLon = lon + dLon;
116 return new Gps(mgLat, mgLon);
117 }
118
119 public static double transformLat(double x, double y) {
120 double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y
121 + 0.2 * Math.sqrt(Math.abs(x));
122 ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
123 ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
124 ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
125 return ret;
126 }
127
128 public static double transformLon(double x, double y) {
129 double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1
130 * Math.sqrt(Math.abs(x));
131 ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
132 ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
133 ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0
134 * pi)) * 2.0 / 3.0;
135 return ret;
136 }
137
138 public static void main(String[] args) {
139
140 // 北斗芯片获取的经纬度为WGS84地理坐标 31.426896,119.496145
141 Gps gps = new Gps(31.426896, 119.496145);
142 System.out.println("gps :" + gps);
143 Gps gcj = gps84_To_Gcj02(gps.getWgLat(), gps.getWgLon());
144 System.out.println("gcj :" + gcj);
145 Gps star = gcj_To_Gps84(gcj.getWgLat(), gcj.getWgLon());
146 System.out.println("star:" + star);
147 Gps bd = gcj02_To_Bd09(gcj.getWgLat(), gcj.getWgLon());
148 System.out.println("bd :" + bd);
149 Gps gcj2 = bd09_To_Gcj02(bd.getWgLat(), bd.getWgLon());
150 System.out.println("gcj :" + gcj2);
151 }