update 3.27

+import utils.CalEnv;
 import utils.Point;
 import utils.TianDiTuTiledMapServiceType;
 

@@ -20,7 +20,7 @@ public class TiandituDownload {
     int[] level = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20};
 
     // 分辨率
-    double[] res = {
+    double[] res4490 = {
             1.40625,
             0.703125,
             0.3515625,
@@ -44,7 +44,7 @@ public class TiandituDownload {
             1.34110450744629E-06
     };
     // 比例尺
-    double[] scale = {
+    double[] scale4490 = {
             400000000,
             295497598.5708346,
             147748799.285417,
@@ -67,6 +67,47 @@ public class TiandituDownload {
             1127.2338812669175,
             563.61694063345875
     };
+
+    double[] scale3857 = {
+            295829355.45,
+            147914677.73,
+            73957338.86,
+            36978669.43,
+            18489334.72,
+            9244667.36,
+            4622333.68,
+            2311166.84,
+            1155583.42,
+            577791.71,
+            288895.85,
+            144447.93,
+            72223.96,
+            36111.98,
+            18055.99,
+            9028,
+            4514,
+            2257};
+
+    double[] res3857 = {
+            0.70391441567318025,
+            0.35195720784848739,
+            0.1759786039123464,
+            0.087989301956173202,
+            0.043994650989983904,
+            0.021997325494991952,
+            0.010998662747495976,
+            0.005499331373747988,
+            0.002749665686873994,
+            0.001374832843436997,
+            0.00068741640982119352,
+            0.00034370821680790179,
+            0.00017185409650664589,
+            8.5927048253322947e-005,
+            4.2963524126661473e-005,
+            2.1481773960635764e-005,
+            1.0740886980317882e-005,
+            5.3704434901589409e-006};
+
     // 最小级别
     int minLevel = 1;
 
@@ -80,19 +121,22 @@ public class TiandituDownload {
     Connection conn = null;
     Statement stmt = null;
 
+    public TiandituDownload() {
+
+    }
+
     public TiandituDownload(String dbpath) {
         this.dbpath = dbpath;
     }
 
     /**
-     *
      * @param originPoint 坐标点
      * @param level       级别
-     * @return 改点在该级别所属的地图瓦片行列号
+     * @return 改点在该级别所属的地图瓦片行列号(4490)
      */
-    private CalEnv calculateEnv(Point originPoint, int level) {
-        int startX = (int) Math.floor((originPoint.getLng() + 180) / (256 * res[level]));
-        int startY = (int) Math.floor((90 - originPoint.getLat()) / (256 * res[level]));
+    private CalEnv calculateEnv4490(Point originPoint, int level) {
+        int startX = (int) Math.floor((originPoint.getLng() + 180) / (256 * res4490[level]));
+        int startY = (int) Math.floor((90 - originPoint.getLat()) / (256 * res4490[level]));
         if (startX < 0) startX = 0;
         if (startY < 0) startY = 0;
 
@@ -100,7 +144,6 @@ public class TiandituDownload {
     }
 
     /**
-     *
      * @param minPoint 下载范围左下角坐标
      * @param maxPoint 下载范围右上角坐标
      * @param level    下载级别
@@ -110,8 +153,8 @@ public class TiandituDownload {
     private void downloadSingLevelTiles(Point minPoint, Point maxPoint, int level, TianDiTuTiledMapServiceType type, boolean merge) {
 
         try {
-            CalEnv startEnv = calculateEnv(minPoint, level);
-            CalEnv stopEnv = calculateEnv(maxPoint, level);
+            CalEnv startEnv = calculateEnv4490(minPoint, level);
+            CalEnv stopEnv = calculateEnv4490(maxPoint, level);
 
             PreparedStatement preparedStatement;
             ResultSet rs;
@@ -179,7 +222,6 @@ public class TiandituDownload {
     }
 
     /**
-     *
      * @param minPoint 下载范围左下角坐标
      * @param maxPoint 下载范围右上角坐标
      * @param minLevel 下载最小级别
@@ -216,6 +258,7 @@ public class TiandituDownload {
 
     /**
      * 下载网络数据
+     *
      * @param url
      * @return 图片数据流
      * @throws Exception