用手机获取GPS坐标 显示在手机地图偏差大约在100-200米左右，我把坐标放在 Maps.google.com 搜索坐标定位则相当精确。
可能是.....为了安全吧故意加的偏差
不过可以计算偏差使位置精确
代码如下
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public class EvilTransform { static
double pi = 3.14159265358979324; static
double a = 6378245.0; static
double ee = 0.00669342162296594323; public
static double mgLat; public
static double mgLon; public
static void transform( double
wgLat, double
wgLon) { if
(outOfChina(wgLat, wgLon)) { mgLat = wgLat; mgLon = wgLon; return; } 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; } 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; }} |
原文：http://www.cnblogs.com/freexiaoyu/p/3558966.html