mars < --- > earth transform

地球坐标到火星坐标的转换算法实现

最新推荐文章于 2021-03-22 10:08:51 发布

ht_stonebridge

最新推荐文章于 2021-03-22 10:08:51 发布

阅读量581

点赞数

CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/neutrojan/article/details/21694689

这是一个Java实现的地球坐标（WGS-84）到火星坐标（GCJ-02）转换的算法。代码包括了从地球坐标转换到火星坐标的方法，以及火星坐标转回地球坐标的静态方法。主要涉及到经纬度的数学运算，适用于地理坐标系统的转换。

import frey.itn.api.core.Coordinate;

/**
 * 地球坐标系 (WGS-84) 到火星坐标系 (GCJ-02) 的转换算法 .
 * 
 * @author Administrator
 * 
 */
public class EvilTransform {
	private static double pi = 3.14159265358979324;
	private static double a = 6378245.0;
	private static double ee = 0.00669342162296594323;

	// World Geodetic System ==> Mars Geodetic System
	public static Coordinate transform(double wgLon, double wgLat) {
		Coordinate nate = new Coordinate();
		if (outOfChina(wgLat, wgLon)) {
			nate.setX(wgLat);
			nate.setY(wgLon);
			return nate;
		}
		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);
		//System.out.println("Coordinate.transform:" + (wgLat + dLat) + ","+ (wgLon + dLon));
		nate.setX(wgLat + dLat);
		nate.setY(wgLon + dLon);
		return nate;
	}

	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;
	}
	/**
	 * 火星 转 地球
	 * @param lat
	 * @param lng
	 * @return
	 */
	static Coordinate transformRevers(double lat,double lng){
		Coordinate cod =transform(lng,lat);
		
		
		double g_lat = cod.getX();
		double g_lng = cod.getY();
		double d_lat  =g_lat-lat;
		double d_lng = g_lng-lng;
		
		Coordinate cad =new Coordinate();
		cad.setX(lat-d_lat);
		cad.setY(lng-d_lng);
		return cad;
		
	}

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		transform(41.80110, 123.4014320);
	}

}