[OSM-talk] Mapnik Improvements regarding Tunnels

[Patrick Weber]

Andy Allan wrote:
> On Nov 30, 2007 3:56 PM, Patrick Weber <p.weber at ucl.ac.uk> wrote:
>   
>> A) If you look at  the following Map Extract:
>> http://www.openstreetmap.org/?lat=51.42871&lon=-0.07201&zoom=16&layers=B0T
>> You can see that in the Mapnik layer, the Rail Tunnel is drawn above the
>> elements that should lay over it like roads and parks. Can we have it by
>> default that Rail Tunnels are drawn on the "bottom" layer, so that other
>> elements can be drawn over it.
>>     
> Can you confirm whether the railway has the appropriate layer tag?
> Adding tunnel = yes doesn't automatically change the render order, as
> far as I'm aware.
>   
I just checked and yes the layer tag is missing. But I do think that  we 
should generally infere a rule that any tunnel should always be rendered 
on the bottom layer by default. If that isnt a default, than that would 
be a feature request yes. Discussion to follow.
>> B) The following map extract:
>> http://www.openstreetmap.org/?lat=49.6101&lon=6.13291&zoom=17&layers=B0T
>> shows a main road that becomes a tunnel in the middle section (you can
>> check by switching to T at H layer). I dont know why this doesnt become a
>> tunnel at all, again it would be great if that could get fixed.
>>     
> It's not "get fixed", so much as having a new feature added (tunnels
> for roads). See
> http://svn.openstreetmap.org/applications/rendering/mapnik/osm.xml -
> you can see that tunnels for railways, trams etc have rendering rules,
> but there's no rules yet for road tunnels.
>   
Okay, well then yes that would make sense to have it for roads yes.
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