[OSM-newbies] How about sanity checks

[Iván Sánchez Ortega]

El Monday 30 July 2007 18:45:10 escribió:
> Ivan,
>
> That was what I needed. Thanks so much. Now I have another question.
>
> The validator is telling me that I have crossing ways. In this situation,
> they need to cross but are not connected. One road is an overpass to
> another. How do I show that in JOSM?

I think you mean having a bridge or a tunnel (please correct me if you mean 
eny other thing).


To tag something as a bridge:
bridge=true
layer=1

To tag something as a tunnel:
tunnel=true
layer=-1

If you have a bridge over a bridge, it should become layer=2. If you should 
ever have a bridge over a bridge over a bridge, layer=3. The same goes for 
tunnels.

AFAIK, the validator plugin checks for overlapping segments that share the 
same layer= value, so putting things on different layers eliminates that 
problem.


By the way: if you have tunnels or bridges, make sure they do not cross in a 
node, or else the routing algorithms will get everyhing wrong. If you have a 
crossing, do make them cross in a node so routing algorithms get the crossing 
right.


Cheers,
-- 
Iván Sánchez Ortega <ivansanchez at escomposlinux.org>