[OSM-talk] displayed width of roads

[Steve Chilton]

Am at work at moment and have no time to look, but I am pretty certain
that bridges are already on a separate rendering layer, so it would be a
case of putting trams between roads and bridges "layers" in the stack.
As Andy says it is confusing to interpret the terminology. All I can do
is test it and see if it works.

Cheers
STEVE

Steve Chilton, Learning Support Fellow
Learning and Technical Support Unit Manager
School of Health and Social Sciences
Middlesex University
phone/fax: 020 8411 5355
email: steve8 at mdx.ac.uk
http://www.mdx.ac.uk/schools/hssc/staff/profiles/technical/chiltons.asp

Chair of the Society of Cartographers: http://www.soc.org.uk/

SoC conference 2008:
http://www.abdn.ac.uk/cartographers08/

-----Original Message-----
From: Andy Allan [mailto:gravitystorm at gmail.com] 
Sent: 20 February 2008 12:43
To: Ben Laenen
Cc: talk at openstreetmap.org; Colin Marquardt; Steve Chilton
Subject: Re: [OSM-talk] displayed width of roads

On Feb 20, 2008 12:27 PM, Ben Laenen <benlaenen at gmail.com> wrote:
> On Wednesday 20 February 2008, Steve Chilton wrote:
> > For mapnik rendering I was thinking of moving tram and light_rail to
> > a new rendering layer which would be placed just after roads and
thus
> > draw them after roads - which is probably the norm.
> >
> > Cheers
> > STEVE
>
> Wouldn't that mean that when a tram goes below a road bridge, that it
is
> displayed over the bridge?

No. There's about 5 different sets of nested "layers" concepts in the
mapnik rendering setup, from working out that primary roads get drawn
over the top of residential roads to get the casing right (rendering
layers) to things with different layer= tags (tagging layers) to
coastlines being drawn first and POIs last (data layers) to stacking
routes (alpha layers, in the cycle map). It's very hard to get your
head round some of it and very easy to get each type of "layer"
confused - trust me!

Cheers,
Andy