墨卡托座標與經緯度轉換

zoom為地圖層級，最小zoom=0，此時瓦片總數量為1

x軸或y軸的瓦片數量=2^zoom

瓦片總數量=2^zoom*2^zoom

每個瓦片畫素為256*256

如：當zoom=2時，x軸y軸的瓦片數量都為2^zoom=4，瓦片總數量=2^zoom*2^zoom=16，

xy軸的畫素長度=4*256=1024

/*
* 當zoom=2時
* x軸或y軸的瓦片數量=2^zoom=4
* 每個瓦片的畫素為256*256
* x軸或y軸的畫素長度長度=256*2^zoom=256*4=1024
** 瓦片總數量=2^zoom*2^zoom=4*4=16
** 85.05112877980659 => -7.958078640513122e-13(約等於0)
* 85.05 => 0.03721464739555813
* 85 => 1.6772247409192573
* 60 => 297.36923224116083
* 45 => 368.3584378011699
* 30 => 422.4770169430887
* 北緯
* 0 => 512.0
* 南緯
* -30 => 601.5229830569114
* -45 => 655.6415621988301
* -60 => 726.6307677588392
* -85 => 1022.3227752590808
* -85.05 => 1023.9627853526044
* -85.05112877980659=>1024.000000000001
*/double v = lattopixel(0, 2);//
double y1 = math.ceil(v / 256);
system.out.println("高德1 "+"y軸座標="+v+" 瓦片編號y="+y1);
double v1 = lattopixel2(0, 2);
double y2=math.ceil(v1 / 256);
system.out.println("高德2 "+"y軸座標="+v1+" 瓦片編號y="+y2);
// /**
* 高德地圖瓦片座標與google map、open street map相同
* 緯度到墨卡托畫素y
*/public double lattopixel(double lat, int zoom) 
/*** 高德地圖瓦片座標與google map、open street map相同
* 緯度到墨卡托畫素y
*/public double lattopixel2(double lat, int zoom)