package com.ard.tianyu.util;
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public class GeoTools {
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public static double calculateDistance(double lat1, double lon1, double lat2, double lon2) {
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final double R = 6371000; // 地球半径，单位：米
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double radLat1 = Math.toRadians(lat1);
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double radLat2 = Math.toRadians(lat2);
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double deltaLat = radLat2 - radLat1;
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double deltaLon = Math.toRadians(lon2 - lon1);
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double a = Math.sin(deltaLat / 2) * Math.sin(deltaLat / 2) +
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Math.cos(radLat1) * Math.cos(radLat2) *
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Math.sin(deltaLon / 2) * Math.sin(deltaLon / 2);
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double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
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return R * c;
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}
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// 经纬度坐标球面距离计算
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public static double DistanceSphere(Vertex v1, Vertex v2) {
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double radLat1 = Math.toRadians(v1.y);
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double radLat2 = Math.toRadians(v2.y);
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double a = Math.abs(radLat1 - radLat2);
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double b = Math.abs(Math.toRadians(v1.x) - Math.toRadians(v2.x));
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double h = Math.pow(Math.sin(a / 2), 2) + Math.cos(radLat1)
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* Math.cos(radLat2) * Math.pow(Math.sin(b / 2), 2);
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double earthRadius = 6371000;
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return 2 * earthRadius * Math.asin(Math.sqrt(h));
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}
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/*
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* 高德坐标系转wgs84
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*/
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public static Vertex GCJ02toWGS84(Vertex v_gcj) {
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Vertex temp = WGS84toGCJ02(v_gcj);
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double lng_wgs = v_gcj.x * 2 - temp.x;
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double lat_wgs = v_gcj.y * 2 - temp.y;
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return new Vertex(lng_wgs, lat_wgs);
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}
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/*
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* wgs84转高德坐标系
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*/
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public static Vertex WGS84toGCJ02(Vertex v_wgs) {
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// 一些常数
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double a = 6378245.0; // 长半轴
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double ee = 0.00669342162296594323; // 扁率
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double lng = v_wgs.x;
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double lat = v_wgs.y;
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//判断是否在国内
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if (OutOfChina(v_wgs))
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return v_wgs;
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double dlat = transformlat(lng - 105.0, lat - 35.0);
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double dlng = transformlng(lng - 105.0, lat - 35.0);
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double radlat = lat / 180.0 * Math.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) * Math.PI);
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dlng = (dlng * 180.0) / (a / sqrtmagic * Math.cos(radlat) * Math.PI);
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return new Vertex(lng + dlng, lat + dlat);
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}
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/*
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* 判断点（经纬度）是否在国内，不在国内不做偏移
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*/
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public static boolean OutOfChina(Vertex v) {
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if (v.x < 72.004 || v.x > 137.8347)
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return true;
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if (v.y < 0.8293 || v.y > 55.8271)
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return true;
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return false;
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}
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public 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 +
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0.1 * lng * lat + 0.2 * Math.sqrt(Math.abs(lng));
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ret += (20.0 * Math.sin(6.0 * lng * Math.PI) + 20.0 *
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Math.sin(2.0 * lng * Math.PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(lat * Math.PI) + 40.0 *
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Math.sin(lat / 3.0 * Math.PI)) * 2.0 / 3.0;
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ret += (160.0 * Math.sin(lat / 12.0 * Math.PI) + 320 *
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Math.sin(lat * Math.PI / 30.0)) * 2.0 / 3.0;
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return ret;
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}
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public static double transformlng(double lng, double lat) {
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double ret = 300.0 + lng + 2.0 * lat + 0.1 * lng * lng +
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0.1 * lng * lat + 0.1 * Math.sqrt(Math.abs(lng));
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ret += (20.0 * Math.sin(6.0 * lng * Math.PI) + 20.0 *
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Math.sin(2.0 * lng * Math.PI)) * 2.0 / 3.0;
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ret += (20.0 * Math.sin(lng * Math.PI) + 40.0 *
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Math.sin(lng / 3.0 * Math.PI)) * 2.0 / 3.0;
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ret += (150.0 * Math.sin(lng / 12.0 * Math.PI) + 300.0 *
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Math.sin(lng / 30.0 * Math.PI)) * 2.0 / 3.0;
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return ret;
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}
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}
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