public class aMapToWGS {
private final static double a=
6378245.0;
private final static double pi=
3.14159265358979324;
private final static double ee=
0.
00669342162296594626;
//gcj-
02 to wgs-
84
public static LatLonPoint toWGS84Point(double latitude,double longitude){
LatLonPoint dev=calDev(latitude, longitude);
double retLat = latitude-dev.getLatitude();
double retLon=longitude-dev.getLongitude();
dev=calDev(retLat, retLon);
retLat=latitude-dev.getLatitude();
retLon=longitude-dev.getLongitude();
return new LatLonPoint(retLat, retLon);
}
//wsg84 to gcj02
public static LatLonPoint toGCJ02Piont(double latitude,double longitude){
LatLonPoint dev=calDev(latitude, longitude);
double retLat = latitude-dev.getLatitude();
double retLon=longitude-dev.getLongitude();
return new LatLonPoint(retLat, retLon);
}
private static LatLonPoint calDev(double wgLat,double wgLon){
if(isOutofChina(wgLat,wgLon)){
return new LatLonPoint(
0,
0);
}
double dLat=calLat(wgLon-
105.0,wgLat-
35.0);
double dLon=calLon(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);
return new LatLonPoint(dLat,dLon);
}
private static double calLat(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;
}
private static double calLon(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;
}
private static boolean isOutofChina(double lat, double lon) {
if(lon<
72.004 || lon>
137.8347){
return true;
}
if(lat<
0.
8293 || lat>
55.8271){
return true;
}
return false;
}
}
