[OSM-talk] Rendering of Place Names in Mapnik

Andy Allan gravitystorm at gmail.com
Fri Dec 19 12:00:31 GMT 2008

On Thu, Dec 18, 2008 at 5:06 PM, Pieren <pieren3 at gmail.com> wrote:
> On Thu, Dec 18, 2008 at 5:12 PM, Elena of Valhalla
> <elena.valhalla at gmail.com> wrote:
>> ok, not that likely, but I wouldn't use a tag with a different meaning
>> when we can just add another specific one;
> Is that really so different ? It is a renderer issue. Mapnik decides
> to not draw one of the names in case of collision. But another
> renderer could make it differently, drawing a name above the other, or
> using smaller font, etc...
> Of course, layer has not to be used in a general context but only in
> something like this:
> if (A.place "is not equal to" B.place)
>    select A or B
> else
>    if (A.admin_level "is not equal to" B.admin_level
>        select A or B
>    else
>        //A.admin_level = B.admin_level
>        select highest A or B layer

The layer tag is for features which are physically vertically
separated. If you have two cities, one of which is physically built
above the other, then the layer tag would be appropriate to show which
one is on top. Other than that, it's simply incorrect.


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