Just to add to Andy's comment, the logic heirarchy for the mapnik slippy map
goes like this:
place=country comes in at z2
place=city AND capital=yes comes in at z4
place=city (not capital) comes in at z6
place=town comes in at z9
place=suburb comes in at z12
place=village comes in at z12
place=hamlet comes in at z14
Both country and city stop being rendered later on, as they would not be
relevant.
All others should render right through.
There are other nuances such as point size changing at various points, and some
changing to grey, but that is not relevant to this discussion.
If anyone has any workable additions to this arrangement, that will work with
the current DB, I am happy to hear them and consider implementing.
If additional nuances are agreed on (population, importance_value, or whatever)
then please let me know when that is in place and I will try to figure a way of
filtering this into the picture.
It is not always possible to predict mapnik's placement clashing decisions, but
I have assumed that as these are rendered before most stuff (painter model
remember) that they would take precedence over symbols and stuff coming later -
but correct me if I am wrong.
Cheers
STEVE
-----Original Message-----
From: [email protected] on behalf of Andy Allan
Sent: Mon 3/23/2009 6:09 PM
To: Tom Hughes
Cc: [email protected]; Woll Newall
Subject: Re: [OSM-talk] Mapnik: strange prioritisation/appearance of
place names
On Mon, Mar 23, 2009 at 3:04 PM, Tom Hughes <[email protected]> wrote:
> Woll Newall wrote:
>
>> It's unclear to me to me how to get this question direct to the
people
>> who configure the OSM Mapnik slippy map layer - Should I just enter
it
>> as a bug into the bug report area on the mapnik.org site? I took a
>> look at the existing bugs thre and they seem to be about "Mapnik",
not
>> "the Mapnik-created slippy map on the OSM site".Does anyone know how
>> to report such things?
>
> What you're looking for is the mapnik component on
> trac.openstreetmap.org but (a) we know about the issue and (b) there
is
> already at least one bug there for it.
And I'd encourage you (Woll, that is) to have a look at the mapnik
style rules file. Whilst long and moderately complex, I can see you're
interested in the problem enough that it's worth your while seeing how
it works rather than trying to reverse-engineer the end result.
http://trac.openstreetmap.org/browser/applications/rendering/mapnik/osm.xml
So you can see in the section starting with
<Style name="city">
That there are four rules for showing city names, and the lowest one
also has a minimum scale. So at a given zoom level, city names stop
showing up. The min scale of 20000 equates to it showing on zoom 14
but not 15.
Cheers,
Andy
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