[talk-au] Bridges and Tunnels

[Liz]

On Mon, 7 Jun 2010, Steve Bennett wrote:
> > Each bridge that currently does not have a layer tag would have layer=1
> > added.
> 
> That will be incorrect if a bridge crosses a body of water (or other
> object) that has a layer tag other than zero. Which means some
> renderers may go from currently rendering something correctly, to
> rendering it incorrectly as a result of that change.

When putting long rivers on the map eg Darling, Bidgee, Lachlan
I routinely put the unsurveyed river at layer=-1
when i actually get there and find whether the road has a bridge, a punt or a 
ford to cross the road, then I do some changes to road and river.

So frequently a body of water will have a layer tag other than zero.

Liz