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The WebMapTiler offers several tiling schemes. Which do I want to use?
The best scheme to use depends on the type of output tile you require. Is a 256x256 tile OK, or do you need a custom size? Do you want Web Mercator or Geographic projection? The following illustration of each tiling scheme can help you decide which is most useful.
column_1 = _tile_column - (2**(_zoom_level - 1)) row_1 = (2**(_zoom_level - 1) - 1) - _tile_row
GoogleMapsCompatible zoom level 0 tiles (column, row):
GoogleMapsCompatible zoom level 1 tiles:
GoogleMapsCompatible zoom level 3 tiles:
column_1 = _tile_column - (2**(_zoom_level - 1)) row_1 = (2**(_zoom_level - 2) - 1) - _tile_row
GoogleCRS84Quad zoom level 0:
GoogleCRS84Quad zoom level 1:
GoogleCRS84Quad zoom level 3:
Level | Degrees |
0 | 1.25764139776733 |
1 | 0.628820698883665 |
2 | 0.251528279553466 |
3 | 0.125764139776733 |
4 | 6.28820698883665e-2 |
5 | 2.51528279553466e-2 |
6 | 1.25764139776733e-2 |
7 | 6.28820698883665e-3 |
8 | 2.51528279553466e-3 |
9 | 1.25764139776733e-3 |
10 | 6.28820698883665e-4 |
11 | 2.51528279553466e-4 |
12 | 1.25764139776733e-4 |
13 | 6.28820698883665e-5 |
14 | 2.51528279553466e-5 |
15 | 1.25764139776733e-5 |
16 | 6.28820698883665e-6 |
17 | 2.51528279553466e-6 |
18 | 1.25764139776733e-6 |
19 | 6.28820698883665e-7 |
20 | 2.51528279553466e-7 |
Level | Spacing (degrees) |
0 | 2 |
1 | 1 |
2 | 0.5 |
3 | 0.333333333333333 |
4 | 0.166666666666667 |
5 | 8.333333333333333e-2 |
6 | 3.333333333333333e-2 |
7 | 1.666666666666667e-2 |
8 | 8.333333333333333e-3 |
9 | 4.166666666666667e-3 |
10 | 1.388888888888889e-3 |
11 | 8.333333333333333e-4 |
12 | 2.777777777777778e-4 |
13 | 1.388888888888889e-4 |
14 | 8.333333333333333e-5 |
15 | 2.777777777777778e-5 |
16 | 8.333333333333333e-6 |
17 | 2.777777777777778e-6 |
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