[OSM-talk] osmarender bounding box cropping

[Thom Shannon]

Yes I am basically building a custom tile maker here! I should probably 
just hack a copy of tiles at home, I used to do a lot of perl so I'll have 
a crack at that. Thanks

Dirk-Lüder Kreie wrote:
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> Thom Shannon schrieb:
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>> When you download your osm data based on a bounding box you get the 
>> whole of any ways with nodes in that box, which is of course quite 
>> sensible. But when you render your SVG, the map you were hoping up ends 
>> up down in the corner somewhere because of a big bit of coast or 
>> motorway sticking out.
>>
>> I'm thinking if I go through the nodes in the osm data and find the 
>> extreme outer points in all four directions, then work backwards I can 
>> figure out the coordinates in the SVG document where my original 
>> bounding box would be. The only problem is I'm not sure what kind 
>> projection osmarender uses to convert the lat/lon coords to a grid.
>>
>> Any ideas on the best way to do this?
>>     
>
> This is the exact same problem tilesAtHome has solved already. I'd have
> to look at the code to tell you what exactly is done. to get the right
> bbox...
>
> - --
>
> Dirk-Lüder "Deelkar" Kreie
> Bremen - 53.0952°N 8.8652°E
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