placement of text like "country name" and "city name" where capitol=true

[Torsten Mohr]

Hello,

i try to render a map of the world with country names and the capitol names
rendered.

I always understood it that way that mapnik calculates based on some rules
if a name should be shown and then places/renders it if it does not overlap
anything else.  Is that correct?

I now try to render it like this (denominator matching and TextSymbolizer
skipped):

# country names
      <Filter>[place] = 'country'</Filter>

# city names
      <Filter>[place] = 'city' and [capital]='yes'</Filter>


I now wonder why in USA only Washington is rendered and in Great Britain i
can see Cardiff and Edingurgh but not London?
In Australia the capitols of the single territories are rendered, not just
Canberra.
Is the "capitol" attribute handled inconsistently?
Should there be one for state_capitol and one for federal_capitol?



In Europe, most capitol names are skipped because they'd overlap the country
names.
Is there a clever way to render them?  Maybe close to where they should be
rendered?  And connected with a thin line or an arrow?


The map of the world looks really cool, just the names of some countries and
of most capitols are missing, it would be great to get this rendered somehow.


Thanks for any hints,
Torsten.


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[Torsten Mohr]

Hello,

thanks a lot for that hint.

Wouldn't label_position_tolerance also be good to use?  I fear when allowing
overlap, the map would be crowded and no background would be visible any
more.


Best regards,
Torsten.


Am Montag, 1. Juni 2009 19:39:48 schrieb Dane Springmeyer:

> Hey Torsten,
>
> See the allow_overlap parameter for the TextSymbolizer:
> https://trac.mapnik.org/wiki/TextSymbolizer
>
> Also z-ordering is another way to make sure that capitols are rendered
> first. To do this you would essentially play around with sorting your
> postgis table records based on state/federal capitols. For more
> details see the 'Ordering Matters' section here:
> http://mike.teczno.com/notes/mapnik.html
>
> Dane
>
> On Jun 1, 2009, at 10:09 AM, Torsten Mohr wrote:
> > Hello,
> >
> > i try to render a map of the world with country names and the
> > capitol names
> > rendered.
> >
> > I always understood it that way that mapnik calculates based on some
> > rules
> > if a name should be shown and then places/renders it if it does not
> > overlap
> > anything else.  Is that correct?
> >
> > I now try to render it like this (denominator matching and
> > TextSymbolizer
> > skipped):
> >
> > # country names
> >      <Filter>[place] = 'country'</Filter>
> >
> > # city names
> >      <Filter>[place] = 'city' and [capital]='yes'</Filter>
> >
> >
> > I now wonder why in USA only Washington is rendered and in Great
> > Britain i
> > can see Cardiff and Edingurgh but not London?
> > In Australia the capitols of the single territories are rendered,
> > not just
> > Canberra.
> > Is the "capitol" attribute handled inconsistently?
> > Should there be one for state_capitol and one for federal_capitol?
> >
> >
> >
> > In Europe, most capitol names are skipped because they'd overlap the
> > country
> > names.
> > Is there a clever way to render them?  Maybe close to where they
> > should be
> > rendered?  And connected with a thin line or an arrow?
> >
> >
> > The map of the world looks really cool, just the names of some
> > countries and
> > of most capitols are missing, it would be great to get this rendered
> > somehow.
> >
> >
> > Thanks for any hints,
> > Torsten.
> >
> >
> > _______________________________________________
> > Mapnik-users mailing list
> > Mapnik-users@...
> > https://lists.berlios.de/mailman/listinfo/mapnik-users

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