[OSM-talk] osmarender bounding box cropping

[Dirk-Lüder Kreie]

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Thom Shannon schrieb:
> 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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