[OSM-talk] administrative boundaries that run along roads - in the Mapnik layer

[Andy Allan]

Hmm. Since the layer tag is supposed to be for defining the relative
vertical displacement of physical features, I think I will rustle up a
patch to osm2pgsql to strip off layer tags for non-physical features
like admin boundaries :-)

If we (or any renderer) want the admin boundaries showing above roads,
it should be controlled through the rendering process rather than
using layer=. For example, I would move the administrative rendering
rule in osm.xml to a separate style from minor-roads, and then put
that style in a separate layer.

Cheers,
Andy


On Feb 10, 2008 7:41 PM, Steve Chilton <S.L.Chilton at mdx.ac.uk> wrote:
> Where I have been mapping admin boundaries I put them all in as layer=1 - this brings them above most things in the mapnik rendering.
> See: http://www.openstreetmap.org/?lat=51.60655&lon=-0.05558&zoom=15&layers=B0FT
>
> Cheers
> STEVE
>
>
>         -----Original Message-----
>         From: talk-bounces at openstreetmap.org on behalf of Adrian Frith
>         Sent: Sun 2/10/2008 7:06 PM
>         To: talk at lists.openstreetmap.org
>         Cc:
>         Subject: [OSM-talk] administrative boundaries that run along roads - in the Mapnik layer
>
>
>
>         Hi All,
>
>         In Cape Town we've been mapping the suburb boundaries (which are
>         official) as boundary=administrative admin_level=10. These boundaries
>         run often down the middle of roads, railways or rivers. They show up
>         very nicely on the Osmarender/T at H layer as dashed red lines - see for
>         example
>         http://www.openstreetmap.org/?lat=-33.95&lon=18.45&zoom=12&layers=0BFT
>
>         On the Mapnik layer, however, they show up only where they do *not* run
>         along roads or railways - it seems that the other features are rendered
>         on top of the boundaries. Should we not be rendering administrative
>         boundaries above real features?
>
>         My understanding is that this would require a change to the z_order code
>         in osm2pgsql. Is that correct?
>
>         Regards,
>         Adrian
>
>
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