[Tilesathome] How to store blank tiles revisited

[OJ W]

I seem to remember there being some reason for choosing database first time
around -- maybe something to do with only 6 bytes per record is a bit of a
waste of 512B inodes?  And there were so many blank tiles to store (it
should be visible in MySQL how many there are now).

We had the usual range of suggestions, from hardlinks, to files, databases,
bitmaps, compressed bitmaps, compacted files, databases per area, etc., etc.

A quadtile index might help in the "search upwards" query[1] (it used to
search each layer in turn until it found the blank tile) if that hasn't been
fixed already, but even that was only a problem if you're browsing the deep
ocean at zoom-17...



[1] LookUpBlankTile in
http://svn.openstreetmap.org/sites/other/tilesAtHome/lib/blanktile.inc

On Mon, Apr 28, 2008 at 6:39 PM, Dirk-Lüder Kreie <osm-list at deelkar.net>
wrote:

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> Jocelyn Jaubert schrieb:
>
> > If I understand correctly how t at h works, blank tile are only used for
> > showing on the slippy map, and they are "generated" by clients.
> >
> > So, could it be possible to use symbolic (or maybe hard) links to store
> > this information ?
>
> I suspect running into not enough inodes (not enough links allowed)
> - -like problems.
>
>
>
> - --
>
> Dirk-Lüder "Deelkar" Kreie
> Bremen - 53.0952°N 8.8652°E
>
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