计算公式:分辨率=360/POWER(2,Level-1)*3600*30.92208/Pixcel |
最低级瓦块大小pixel | 256 | 512 | 512 | |
影像等级 | Web墨卡托 | BING地图 | 影像等级 | WGS84 |
1 | 156543.03 | 78271.515 | -4 | 7827.1515 |
2 | 78271.515 | 39135.7575 | -3 | 3913.57575 |
3 | 39135.7575 | 19567.87875 | -2 | 1956.787875 |
4 | 19567.87875 | 9783.939375 | -1 | 978.3939375 |
5 | 9783.939375 | 4891.969688 | 0 | 489.1969688 |
6 | 4891.969688 | 2445.984844 | 1 | 244.5984844 |
7 | 2445.984844 | 1222.992422 | 2 | 122.2992422 |
8 | 1222.992422 | 611.4962109 | 3 | 61.14962109 |
9 | 611.4962109 | 305.7481055 | 4 | 30.57481055 |
10 | 305.7481055 | 152.8740527 | 5 | 15.28740527 |
11 | 152.8740527 | 76.43702637 | 6 | 7.643702637 |
12 | 76.43702637 | 38.21851318 | 7 | 3.821851318 |
13 | 38.21851318 | 19.10925659 | 8 | 1.910925659 |
14 | 19.10925659 | 9.554628296 | 9 | 0.95546283 |
15 | 9.554628296 | 4.777314148 | 10 | 0.477731415 |
16 | 4.777314148 | 2.388657074 | 11 | 0.238865707 |
17 | 2.388657074 | 1.194328537 | 12 | 0.119432854 |
18 | 1.194328537 | 0.597164268 | 13 | 0.059716427 |
19 | 0.597164268 | 0.298582134 | 14 | 0.029858213 |
20 | 0.298582134 | 0.149291067 | 15 | 0.014929107 |
21 | 0.149291067 | 0.074645534 | 16 | 0.007464553 |
22 | 0.037322767 | |||
23 | 0.018661383 | |||
地球半径R | 周长=2*PI*R | 1度 | 1秒 | |
值(m) | 6378137 | 40075017 | 111319.4908 | 30.92208078 |
0.000277778 |
这些系统的金字塔的结构和每层的分辨率都是固定的。当进行影像裁剪的时候是把现实影像映射到这样的结构中。
如0.5m分辨率的影像对应bing地图的18级则精度会有损失,所以要裁剪为19级。