Hi!
Jon Burgess schrieb:
> For highways, unimportant roads like unclassified and residential are
> rendered first and the motorways are drawn on top. This ensures that
> motorways are not obscured by more minor roads.
>
> In addition, the presence of a layer, tunnel or bridge tag also effects
> the z_order. This ensures objects on one layer render on top of objects
> on a lower layer.
>
> The are details which I have glossed over in the description above, you
> will have to read the source to see the exact calculations. Or ask some
> more specific questions.
Thank you, that was pretty much the information I was looking for. In
detail, I need to know what tags I can strip during preprocessing and
what tags I need to preserve for osm2pgsql.
Do you know whether the level tag is evaluated for the z_order?
thanks
Nop
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