Tiles@home/Zoom levels

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0 Generated by LowZoom from z6 Whole world in a tile
1 4 tiles
2 16 tiles
3
4
5 Continent
6 Generated by LowZoom from z12
7 Region
8
9 City
10
11
12 Generated by tiles@home ~10km across
13
14
15
16
17 One street

The area covered by a zoom-12 with tiles to zoom 18 is refered to as a "tileset". The x and y value at zoom 12 are used when specifying areas that need to be rendered (queues and requests)