package com.ld.igds.util;
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/**
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* 百度工具类
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*
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* @author:
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* @description:
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* @version:
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* @data:
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*/
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public class GpsToBdUtil {
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// WGS-84 坐标系 转 GCJ-02
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private final static double pi = 3.14159265358979324;
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private final static double a = 6378245.0;
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private final static double ee = 0.00669342162296594323;
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// GCJ-02坐标系 转 BD-09
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private static final double x_pi = 3.14159265358979324 * 3000.0 / 180.0;
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/**
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* @param lat:纬度 lon:经度 gps纬度转百度地图
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* @return 0:纬度 1:经度
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*/
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public static String[] getBaiDu(String lat, String lon) {
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double latlng[] = new double[2];
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String[] result = new String[2];
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double longitude_m = Double.parseDouble(lon);//
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double latitudeM = Double.parseDouble(lat);//
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double[] transform = transform(latitudeM, longitude_m, latlng);
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if (transform != null) {
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result[0] = bd_encrypt(transform[0], transform[1])[0] + "";
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result[1] = bd_encrypt(transform[0], transform[1])[1] + "";
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return result;
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}
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return result;
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}
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private static double[] transform(double wgLat, double wgLon, double[] latlng) {
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if (outOfChina(wgLat, wgLon)) {
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latlng[0] = wgLat;
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latlng[1] = wgLon;
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return null;
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}
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double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
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double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
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double radLat = wgLat / 180.0 * pi;
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double magic = Math.sin(radLat);
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magic = 1 - ee * magic * magic;
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double sqrtMagic = Math.sqrt(magic);
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dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
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dLon = (dLon * 180.0) / (a / sqrtMagic * Math.cos(radLat) * pi);
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latlng[0] = wgLat + dLat;
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latlng[1] = wgLon + dLon;
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return latlng;
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}
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private static boolean outOfChina(double lat, double lon) {
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if (lon < 72.004 || lon > 137.8347)
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return true;
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if (lat < 0.8293 || lat > 55.8271)
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return true;
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return false;
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}
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private static double transformLat(double x, double y) {
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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));
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ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
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ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
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return ret;
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}
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private static double transformLon(double x, double y) {
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double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
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ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 * pi)) * 2.0 / 3.0;
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ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
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return ret;
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}
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private static double[] bd_encrypt(double gg_lat, double gg_lon) {
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double x = gg_lon, y = gg_lat;
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double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * x_pi);
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double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * x_pi);
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double bd_lon = z * Math.cos(theta) + 0.0065;
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double bd_lat = z * Math.sin(theta) + 0.006;
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double[] tmp = new double[2];
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tmp[0] = bd_lat;
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tmp[1] = bd_lon;
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return tmp;
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}
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}
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