[Tilesathome] steam over landuse

[Knut Arne Bjørndal]

On Wed, Feb 04, 2009 at 12:37:50PM +0100, Chris-Hein Lunkhusen wrote:
> D Tucny schrieb:
> 
> >  <http://www.informationfreeway.org/?lat=51.912&lon=7.737&zoom=16>
> 
> > > But the stream is tagged as layer -1, so is underground as landuse
> > > will assume 0 (but render behind other layer 0 objects).
> > 
> >     Yes, streams are often tagged as -1 so that they are rendered
> >     under streets. In Wiki there is also the recommendation to
> >     tag waterways as -1.
> > 
> >     So landuse should never cover other objects.
> >     Landuse should be assumed as layer -100. ;-)

Virtual landuse things like residential and industrial are done at -5
(the lowest layer osmarender processes).

The practice of always tagging waterways as -1 sound stupid to me, the
layer tag is meant to describe where something is in relation to the
normal earth surface, and I'd say most streams are _at_ that height,
not (significantly) below it.

> > I thought there was a discussion about this at some point in the past
> > and that the outcome was that the feeling was that landuse should be
> > drawn first, though allowing layers within the landuse 'layer' then
> > other features drawn over whatever the outcome of the landuse layer
> > was... which, would be effectively the same as making landuse
> > effectively exist at -100 to -90...
> > Can't remember the details, but will try and find the mails...
> 
> It makes no sense that a "virtual" object like landuse
> covers any "real" object like streams or whatever, no matter
> what the layer is.

As forests are physical objects they are drawn in the normal order.

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