[Tilesathome] www down?

[Robert (Jamie) Munro]

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Frederik Ramm wrote:
> On levels 0-12 combined, we have a total of about 22 million tiles  
> for the whole world, of which about 6.7 million will be land tiles.  
> Now this is a figure one could deal with - 6.7 million rows of 50  
> bytes each is about 350 Megabytes in an SQL table. If we employ  
> strict recursion (i.e. "if a level-5 tile is fully on land, then do  
> not store any of the tiles contained therein explicitly"), we can get  
> that figure down from 6.7 million to a small six-digit figure (I  
> computed it once but forgot the exact number), but that would of  
> course mean a performance penalty when retrieving data.

But that performance penalty may be more than offset by the fact that
more of the database will fit into caches etc.


Robert (Jamie) Munro
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