[OSM-dev] Fwd: Script to extract bbox from history planet

[Stefan de Konink]

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Op 16-12-10 09:22, Frederik Ramm schreef:
> If someone feels like (a) re-implementing this in C 

I think Mitja did this in the GSoC program this summer (the cutout
thing). It would be valuable to figure out a way to do 'proper' full
ways and relations in a low memory setting, but probably I/O itself is
always an issue too.

I can imagine that you create a cutout of the nodes first, quicksort it
in a mmap-file and then run it over the ways table. Storing a mmap file
with only the way ids,quicksort on it and walk over the relations part.

Now a second run would grab the missing ways, and the remaining nodes.


I wonder if it can be done more efficiently.


Stefan
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