火星坐标和地球坐标的转换

/****
 * 坐标转换工具类
 * @author wanwenjun
 *
 */
public class TransLocationUtil {

	private static double pi = 3.14159265358979324D;// 圆周率
	private static double a = 6378245.0D;// WGS 长轴半径
	private static double ee = 0.00669342162296594323D;// WGS 偏心率的平方

	/**
	 * 中国坐标内
	 * 
	 * @param lat
	 * @param lon
	 * @return
	 */
	public 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;
	}

	public 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;
	}
	
	// 84->gcj02
	public 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;
	}

	/****
	 * 地球坐标转火星坐标
	 * @param lon
	 * @param lat
	 * @return
	 */
	public static Map<String, Double> transform(double lon, double lat) {
		HashMap<String, Double> localHashMap = new HashMap<String, Double>();
			if (outofChina(lat, lon)) {
				localHashMap.put("lon", Double.valueOf(lon));
				localHashMap.put("lat", Double.valueOf(lat));
				return localHashMap;
			}
			double dLat = transformLat(lon - 105.0, lat - 35.0);
			double dLon = transformLon(lon - 105.0, lat - 35.0);
			double radLat = lat / 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);
			double mgLat = lat + dLat;
			double mgLon = lon + dLon;
			localHashMap.put("lon", mgLon);
			localHashMap.put("lat", mgLat);
			return localHashMap;
		}
		
		// gcj02-84
	/****
	 * 火星坐标转地球坐标
	 * @param lon
	 * @param lat
	 * @return
	 */
	public static Map<String, Double> gcj2wgs(double lon, double lat) {
			Map<String, Double> localHashMap = new HashMap<String, Double>();
			double lontitude = lon
					- (((Double) transform(lon, lat).get("lon")).doubleValue() - lon);
			double latitude = (lat - (((Double) ( transform(lon, lat))
					.get("lat")).doubleValue() - lat));
			localHashMap.put("lon", lontitude);
			localHashMap.put("lat", latitude);
			return localHashMap;
		}
}