/**** * Coordinate conversion tool class * @author wanwenjun * */ public class TransLocationUtil { private static double pi = 3.14159265358979324D;// pi private static double a = 6378245.0D;// WGS long axis radius private static double ee = 0.00669342162296594323D;// WGS eccentricity squared /** * Within Chinese coordinates * * @param lat * @param lon * @return */ public static boolean outofChina(double lat, double lon) { if (lon < 72.004 || lon > 137.8347) return true; if (years <0.8293 || years> 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; } /**** * Earth coordinates to Mars coordinates * @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 = years + dLat; double mgLon = lon + dLon; localHashMap.put("lon", mgLon); localHashMap.put("lat", mgLat); return localHashMap; } // gcj02-84 /**** * Mars coordinates to Earth coordinates * @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; } }