Versions Compared

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

Table of Contents

Number of Zoom Levels in TMS

In the TMS protocol zoom level 0 (z=0) returns the lowest zoom, which is a single tile showing the world map. Zoom level 21 (z=21) returns Nearmap's imagery at approximately 7.5cm for the given tile coordinates. The maximum zoom level is 24, but in most areas the returned imagery would be upscaled imagery from zoom level 21. Below is a graph showing the zoom level, the pixel size at each zoom level, the tile edge size and the area covered by each tile:


Zoom

 Pixel Size (m)

(At Equator)

Tile Edge Size (m)Area covered by tile (m)
0155,495.01839,806,724.671584575329188990.00
77,747.509 19,903,362.34 396143832297249.00
38,873.7559,951,681.17 99035958074312.20
19,436.8774,975,840.58 24758989518578.00
9,718.439 2,487,920.29 6189747379644.51
4,859.219 1,243,960.15 1547436844911.13
2,429.610 621,980.07 386859211227.78
1,214.805 310,990.04 96714802806.95
607.402 155,495.02 24178700701.74
303.701 77,747.51 6044675175.43
10 151.851 38,873.75 1511168793.86
11 75.925 19,436.88 377792198.46
12 37.963 9,718.44 94448049.62
13 18.981 4,859.22 23612012.40
14 9.491 2,429.61 5903003.10
15 4.745 1,214.80 1475750.78
16 2.373 607.40 368937.69
17 1.186 303.70 92234.42
18 0.593 151.85 23058.61
19 0.297 75.93 5764.65
20 0.148 37.961441.16
21 0.074 18.98 360.29
22 0.037 9.49 90.07
230.019 4.75 22.52
24 0.009 2.37 5.63

Maximum X and Y Values in TMS

...