Hi!
I can give you an indication about the distribution of tile requests by zoom
levels on my hiking map server at wanderreitkarte.de.
<=z8 z9 z10 z11 z12 z13 z14 z15 z16 z17
z18
19% 3% 4% 5% 6% 10% 14% 18% 8% 5%
3%
This told me that prerendering is worthwhile only up to up to z15.
I also used to do a regional analysis which showed great differences in
access frequency and density. But that distribution depends strongly on the
purpose of your map - in my case it was well-known hiking and holiday
regions. The only general rule is that ocean tiles are almost never
accessed.
If you are concerned about storage space, you have the option to do a lot of
on-demand rendering and regularly delete tiles that are older than n days.
But in my experience, tile storage growth slows down asymptotoically over
time, so I never had to implement that.
bye
Nop
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