package com.genersoft.iot.vmp.utils;
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/**
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* 坐标转换
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* 一个提供了百度坐标（BD09）、国测局坐标（火星坐标，GCJ02）、和WGS84坐标系之间的转换的工具类
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* 参考https://github.com/wandergis/coordtransform 写的Java版本
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* @author Xinconan
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* @date 2016-03-18
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* @url https://github.com/xinconan/coordtransform
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*/
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public class Coordtransform {
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private static double x_PI = 3.14159265358979324 * 3000.0 / 180.0;
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private static double PI = 3.1415926535897932384626;
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private static double a = 6378245.0;
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private static double ee = 0.00669342162296594323;
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/**
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* 百度坐标系 (BD-09) 与 火星坐标系 (GCJ-02)的转换
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* 即 百度 转 谷歌、高德
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* @param bd_lon
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* @param bd_lat
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* @return Double[lon,lat]
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*/
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public static Double[] BD09ToGCJ02(Double bd_lon,Double bd_lat){
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double x = bd_lon - 0.0065;
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double y = bd_lat - 0.006;
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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[] arr = new Double[2];
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arr[0] = z * Math.cos(theta);
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arr[1] = z * Math.sin(theta);
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return arr;
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}
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/**
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* 火星坐标系 (GCJ-02) 与百度坐标系 (BD-09) 的转换
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* 即谷歌、高德 转 百度
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* @param gcj_lon
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* @param gcj_lat
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* @return Double[lon,lat]
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*/
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public static Double[] GCJ02ToBD09(Double gcj_lon,Double gcj_lat){
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double z = Math.sqrt(gcj_lon * gcj_lon + gcj_lat * gcj_lat) + 0.00002 * Math.sin(gcj_lat * x_PI);
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double theta = Math.atan2(gcj_lat, gcj_lon) + 0.000003 * Math.cos(gcj_lon * x_PI);
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Double[] arr = new Double[2];
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arr[0] = z * Math.cos(theta) + 0.0065;
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arr[1] = z * Math.sin(theta) + 0.006;
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return arr;
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}
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/**
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* WGS84转GCJ02
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* @param wgs_lon
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* @param wgs_lat
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* @return Double[lon,lat]
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*/
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public static Double[] WGS84ToGCJ02(Double wgs_lon,Double wgs_lat){
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if(outOfChina(wgs_lon, wgs_lat)){
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return new Double[]{wgs_lon,wgs_lat};
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}
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double dlat = transformlat(wgs_lon - 105.0, wgs_lat - 35.0);
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double dlng = transformlng(wgs_lon - 105.0, wgs_lat - 35.0);
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double radlat = wgs_lat / 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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dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
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Double[] arr = new Double[2];
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arr[0] = wgs_lon + dlng;
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arr[1] = wgs_lat + dlat;
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return arr;
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}
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/**
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* GCJ02转WGS84
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* @param gcj_lon
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* @param gcj_lat
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* @return Double[lon,lat]
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*/
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public static Double[] GCJ02ToWGS84(Double gcj_lon,Double gcj_lat){
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if(outOfChina(gcj_lon, gcj_lat)){
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return new Double[]{gcj_lon,gcj_lat};
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}
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double dlat = transformlat(gcj_lon - 105.0, gcj_lat - 35.0);
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double dlng = transformlng(gcj_lon - 105.0, gcj_lat - 35.0);
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double radlat = gcj_lat / 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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dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * PI);
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double mglat = gcj_lat + dlat;
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double mglng = gcj_lon + dlng;
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return new Double[]{gcj_lon * 2 - mglng, gcj_lat * 2 - mglat};
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}
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private static Double transformlat(double lng, double lat) {
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double ret = -100.0 + 2.0 * lng + 3.0 * lat + 0.2 * lat * lat + 0.1 * lng * lat + 0.2 * Math.sqrt(Math.abs(lng));
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ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(lat * PI) + 40.0 * Math.sin(lat / 3.0 * PI)) * 2.0 / 3.0;
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ret += (160.0 * Math.sin(lat / 12.0 * PI) + 320 * Math.sin(lat * PI / 30.0)) * 2.0 / 3.0;
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return ret;
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}
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private static Double transformlng(double lng,double lat) {
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double ret = 300.0 + lng + 2.0 * lat + 0.1 * lng * lng + 0.1 * lng * lat + 0.1 * Math.sqrt(Math.abs(lng));
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ret += (20.0 * Math.sin(6.0 * lng * PI) + 20.0 * Math.sin(2.0 * lng * PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(lng * PI) + 40.0 * Math.sin(lng / 3.0 * PI)) * 2.0 / 3.0;
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ret += (150.0 * Math.sin(lng / 12.0 * PI) + 300.0 * Math.sin(lng / 30.0 * PI)) * 2.0 / 3.0;
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return ret;
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}
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/**
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* outOfChina
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* @描述: 判断是否在国内，不在国内则不做偏移
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* @param lng
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* @param lat
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* @return {boolean}
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*/
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private static boolean outOfChina(Double lng,Double lat) {
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return (lng < 72.004 || lng > 137.8347) || ((lat < 0.8293 || lat > 55.8271) || false);
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};
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}
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