[Tilesathome] no wood / forest at z11 and below?

[Martin Koppenhoefer]

Hi 80n,

thanks for your long comments.

I would be possible to do this, yes.  But what is the point of having two
> map renderers if they both produce identical output?
>


of course not identical. I'm promoting forests (and probably other landuse
as well) for all low-zoom-levels, Mapnik has them until Z9 (but glaciers
till Z6 - I guess because that's technically easier as there only few of
them).



> In general the Mapnik rendering is more conventional, whereas the T at Hrendering provides more opportunities for experimentation and innovation.
>


yes, I know



> One of the innovations with the current T at H configuration, which is
> particularly interesting for the OSM project, is that the very low zooms,
> like here
> http://www.informationfreeway.org/?lat=37.422865778883406&lon=53.13083873035404&zoom=3&layers=B0000F000Fshow the road mapping density very well.  Compare that with the same zoom
> level on Mapnik or Google to understand the difference.
>


I noticed this before, I like it, and I would integrate that with the
forests (btw.: I guess that forest density/detail and mapped road density
corelate) simply by putting the forests under the streets as we have always
done.



> This view is very useful for demonstrating the true coverage of OSM.  And
> that is an important thing to be able to do.
>


fully ack



> low zoom levels are generated by starting with a captionless set of z12
> tiles and combining them with a different caption set at each level.  If
> landuse were to be rendered at z11 then this would have an effect on lower
> zoom levels.  In particular it would drown out the detail of the road
> network and many areas would just be a grey-green blur.
>

this is an assumption that could be true for incompatible colours (i.e. with
small contrast). If there is a detail that can be recognized with grey/white
background in a scaled view (e.g. z8 generated from z9) it will be
recognizable with a green bg as well.



> It would be possible to achieve what you want if another variant of the z12
> tiles was generated that included landuse.  This landuse tileset could then
> be used for z11 and maybe z10 and then use the non-landuse tileset for z9
> and lower.
>

IMHO there's no problem with landuse beeing displayed in lower zoomlevels
(for the same coverage demonstration reasons you mention above), I wouldn't
restrict it to Z10/11.

cheers,
Martin
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