[OSM-dev] Layered Tiling (Mapnik)

[marqqs at gmx.eu]

Sounds great, but it's not that easy, I think...

Depending of the map layers you compose, you would need different text layer compositions. For example:

In my public transport map, there are priorities for the texts; the name of a railway station has always a higher priority than the name of a bus stop. Hence, if there is bus stop nearby a railway station, the name of the bus stop is not displayed.
Now, if you would decide to have different layers for railways and buses, and to switch off the railway layer, the name of the bus stop would have to reappear.

To go one step further:
Ideal would it be to move the colliding texts slightly instead of omitting them. But then, how to deal with different map layers?

Markus


-------- Original-Nachricht --------
> Datum: Tue, 28 Dec 2010 07:30:51 +0100
> Von: Igor Brejc <igor.brejc at gmail.com>
> An: marqqs at gmx.eu
> CC: Frederik Ramm <frederik at remote.org>, dev at openstreetmap.org
> Betreff: Re: [OSM-dev] Layered Tiling (Mapnik)

> On Mon, Dec 27, 2010 at 11:29 PM, <marqqs at gmx.eu> wrote:
> 
> >
> > But there is one problem you would have to deal with: there is no
> collision
> > avoidance between the texts of different tile layers.
> >
> >
> That could be solved if the all the layers were rendered as a single map,
> but painted onto several layer bitmaps. I'm planning to implement
> something
> like this in Maperitive.
> 
> Igor