Rough Calculations

gistfile1.txt

https://github.com/linz/tile-services/issues/42

https://github.com/linz/tile-services/issues/41

Assuming PNG, 8bit color, and nz mainland coverage only 

NZTM Zoom 15 (1:500 scale): 612850336 tiles
NZTM zoom 16 (1:250 scale): 2451401344 tiles

Webmer Zoom 19 (1:1000 scale): 228236192 tiles
Webmer zoom 20 (1:500 scale): 912944768 tiles

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Assuming 40kb per tile (worst case scenario)

NZTM Zoom 15 (1:500 scale): 612850336 tiles * 40kb = 24514013440 kb
NZTM zoom 16 (1:250 scale): 2451401344 tiles * 40kb = 98056053760 kb

Webmer Zoom 19 (1:1000 scale): 228236192 tiles * 40kb = 9129447680 kb
Webmer zoom 20 (1:500 scale): 912944768 tiles * 40kb = 36517790720 kb

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NZTM Zoom 15 (1:500 scale): 24514013440 kb /1024/1024/1024 = 22.83 TB (tile cache size)
NZTM zoom 16 (1:250 scale): 98056053760 kb /1024/1024/1024 = 91.32 TB (tile cache size)

Webmer Zoom 19 (1:1000 scale): 9129447680 kb /1024/1024/1024 = 8.5 TB (tile cache size)
Webmer zoom 20 (1:500 scale): 36517790720  kb /1024/1024/1024 = 34.00 TB (tile cache size)