[OSM-dev] Cutting the planet into tiles

Shaun McDonald shaun at shaunmcdonald.me.uk
Thu Dec 4 23:41:09 GMT 2008

On 4 Dec 2008, at 23:18, Ben Supnik wrote:

> Hi,
> Andras and I were looking at cutting the OSM planet file into 1x1  
> degree
> tiles (including at least enough nodes outside the tile to correctly
> "chop" a way at the tile boundary).
> I think I have an algorithm that can do this in four passes over the
> planet file on a 32-bit machine, using perhaps 2-3 GB of RAM.
> Before I go forward...am I reinventing the wheel?  I know that osmosis
> can do this kind of thing, but my understanding is that it extracts a
> finite number of "streams" from the data...we actually want to take  
> all
> of the data and split it into 64800 parts.
> If no one has something like this and I can get it working, I'll post
> the code somewhere. :-)

What is the end use case of splitting the data this way?

Are the current country (or in the case of the US, state) extracts not  


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