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...@hrendering provides more opportunities for experimentation and > innovation. > yes, I know > One of the innovations with the current t...@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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