java程式碼火星座標系轉GPS標準座標系
阿新 • • 發佈：2019-02-16
Android開發中最近產品提出了一項需求，要求客戶端上傳地理位置給伺服器，本來android已經集成了百度地圖的sdk，但是iOS端整合的是高德地圖sdk，因此需要在上傳之後統一資料格式，所以就想到了將不同廠家提供的座標系轉換成標準gps座標系。
簡單解釋下火星座標系：大天朝為了保證我們領土隱私等，規定各大廠商弄出來的定位產品給出的座標系都要經過加密偏移，於是就成了火星座標系，所以拿百度座標系放到谷歌地圖上可以明顯看到位置有很大偏差，具體科普在這裡：http://yanue.net/post-121.html
/** * 座標轉換程式 * * WGS84座標系：即地球座標系，國際上通用的座標系。Earth * * GCJ02座標系：即火星座標系，WGS84座標系經加密後的座標系。Mars * * BD09座標系：即百度座標系，GCJ02座標系經加密後的座標系。 Bd09 * * 搜狗座標系、圖吧座標系等，估計也是在GCJ02基礎上加密而成的。 * * 百度地圖API 百度座標 騰訊搜搜地圖API 火星座標 搜狐搜狗地圖API 搜狗座標* 阿里雲地圖API 火星座標 圖吧MapBar地圖API 圖吧座標 * 高德MapABC地圖API 火星座標 靈圖51ditu地圖API 火星座標 * * @author fankun * */ public class BDToGPS { private static double PI = Math.PI; private static double AXIS = 6378245.0; // private static double OFFSET = 0.00669342162296594323; // (a^2 - b^2) / a^2 private static double X_PI = PI * 3000.0 / 180.0; // GCJ-02=>BD09 火星座標系=>百度座標系 public static double[] gcj2BD09(double glat, double glon) { double x = glon; double y = glat; double[] latlon = new double[2]; double z = Math.sqrt(x * x + y * y) + 0.00002 * Math.sin(y * X_PI); double theta = Math.atan2(y, x) + 0.000003 * Math.cos(x * X_PI); latlon[0] = z * Math.sin(theta) + 0.006; latlon[1] = z * Math.cos(theta) + 0.0065; return latlon; } // BD09=>GCJ-02 百度座標系=>火星座標系 public static double[] bd092GCJ(double glat, double glon) { double x = glon - 0.0065; double y = glat - 0.006; double[] latlon = new double[2]; double z = Math.sqrt(x * x + y * y) - 0.00002 * Math.sin(y * X_PI); double theta = Math.atan2(y, x) - 0.000003 * Math.cos(x * X_PI); latlon[0] = z * Math.sin(theta); latlon[1] = z * Math.cos(theta); return latlon; } // BD09=>WGS84 百度座標系=>地球座標系 public static double[] bd092WGS(double glat, double glon) { MyLog.d("WWW==緯度:"+glat); MyLog.d("WWW==經度:"+glon); double[] latlon = bd092GCJ(glat, glon); return gcj2WGS(latlon[0], latlon[1]); } // WGS84=》BD09 地球座標系=>百度座標系 public static double[] wgs2BD09(double wgLat, double wgLon) { double[] latlon = wgs2GCJ(wgLat, wgLon); return gcj2BD09(latlon[0], latlon[1]); } // WGS84=》GCJ02 地球座標系=>火星座標系 public static double[] wgs2GCJ(double wgLat, double wgLon) { double[] latlon = new double[2]; if (outOfChina(wgLat, wgLon)) { latlon[0] = wgLat; latlon[1] = wgLon; return latlon; } double[] deltaD = delta(wgLat, wgLon); latlon[0] = wgLat + deltaD[0]; latlon[1] = wgLon + deltaD[1]; return latlon; } // GCJ02=>WGS84 火星座標系=>地球座標系(粗略) public static double[] gcj2WGS(double glat, double glon) { double[] latlon = new double[2]; if (outOfChina(glat, glon)) { latlon[0] = glat; latlon[1] = glon; return latlon; } double[] deltaD = delta(glat, glon); latlon[0] = glat - deltaD[0]; latlon[1] = glon - deltaD[1]; return latlon; } // GCJ02=>WGS84 火星座標系=>地球座標系（精確） public static double[] gcj2WGSExactly(double gcjLat, double gcjLon) { double initDelta = 0.01; double threshold = 0.000000001; double dLat = initDelta, dLon = initDelta; double mLat = gcjLat - dLat, mLon = gcjLon - dLon; double pLat = gcjLat + dLat, pLon = gcjLon + dLon; double wgsLat, wgsLon, i = 0; while (true) { wgsLat = (mLat + pLat) / 2; wgsLon = (mLon + pLon) / 2; double[] tmp = wgs2GCJ(wgsLat, wgsLon); dLat = tmp[0] - gcjLat; dLon = tmp[1] - gcjLon; if ((Math.abs(dLat) < threshold) && (Math.abs(dLon) < threshold)) break; if (dLat > 0) pLat = wgsLat; else mLat = wgsLat; if (dLon > 0) pLon = wgsLon; else mLon = wgsLon; if (++i > 10000) break; } double[] latlon = new double[2]; latlon[0] = wgsLat; latlon[1] = wgsLon; return latlon; } // 兩點距離 public static double distance(double latA, double logA, double latB, double logB) { int earthR = 6371000; double x = Math.cos(latA * Math.PI / 180) * Math.cos(latB * Math.PI / 180) * Math.cos((logA - logB) * Math.PI / 180); double y = Math.sin(latA * Math.PI / 180) * Math.sin(latB * Math.PI / 180); double s = x + y; if (s > 1) s = 1; if (s < -1) s = -1; double alpha = Math.acos(s); double distance = alpha * earthR; return distance; } public static double[] delta(double wgLat, double wgLon) { double[] latlng = new double[2]; 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 - OFFSET * magic * magic; double sqrtMagic = Math.sqrt(magic); dLat = (dLat * 180.0) / ((AXIS * (1 - OFFSET)) / (magic * sqrtMagic) * PI); dLon = (dLon * 180.0) / (AXIS / sqrtMagic * Math.cos(radLat) * PI); latlng[0] = dLat; latlng[1] = dLon; return latlng; } 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; } 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; } }