[Tilesathome] Lowzoom Place Labels displaced

[Knut Arne Bjørndal]

On Fri, Sep 19, 2008 at 07:25:04AM +0200, Sebastian Spaeth wrote:
> This is still the case. The lower zoom, the worse. That is why I turned 
> of lowzoom captions on z0-6 again. Continent captions, country captions 
> were far (extremely far) out of place. I think the place where Oslo is 
> located was labeled "Italy" :-).
> 
> Fixing this to use proper projection and have labels be displayed 
> correctly would be awsome. Basically, it would use the correct "Project" 
> functions in 2-3 places in orp (as the patch you forwarded me once did), 
>    right? bobkare was interested to do the same in XSLT (apparently they 
> have cos/sin emulation now), which would make us use proper projection 
> which would be good anyway. Frederik, do you think you (or somebody 
> else) could have a go at that?

I had a look at that patch, and couldn't really wrap my head around
why it would work. I discussed the projection stuff with 80n a while
ago, and iirc he had tried making those calculations more accurate
without seeing any improvements in the output, so I'm not sure that's
the way to go to fix the problem.

It might perhaps be feasible to actually do proper projection in
osmarender by creating a template that does the projection calculation
and then getting x/y from it everywhere we need them. Anybody see any
glaring mistakes with this?

This would probably break tiles at home in interesting ways, given that
it does some workarounds for osmarenders lack of projection, so some
reengineering of the client is probably also needed.

I have plenty other things to do before I'll have time to look at
this, so if anybody wants it fast it's a good time to start looking at
the xslt :)

-- 
Knut Arne Bjørndal
aka Bob Kåre
bob+osm at cakebox.net
bobkare at irc
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