[OSM-talk] osmarender bounding box cropping

[Thom Shannon]

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?