public class Gps {
private double wgLat;
private double wgLon;
public Gps(double wgLat, double wgLon) {
setWgLat(wgLat);
setWgLon(wgLon);
}
public double getWgLat() {
return wgLat;
}
public void setWgLat(double wgLat) {
this.wgLat = wgLat;
}
public double getWgLon() {
return wgLon;
}
public void setWgLon(double wgLon) {
this.wgLon = wgLon;
}
@Override
public String toString() {
return wgLat + "," + wgLon;
}
}
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 }
152 }