Frederik Ramm wrote > Hi, > > On 13.01.2013 21:23, Gervase Markham wrote: >> Did we ever do z=19? > > To my knowledge, no.
I am also reasonably sure z19 never existed. Osmarender only used to go to Z17 and so mapnik had one zoom level more than osmarender, but neither went further than z18. Frederik Ramm wrote >> Did we stop because it's a load more disk space, or >> something like that? If not, could we consider it? > > Given that very few areas are going to be even looked at at z19 I > suspect the additional disk space used would not amount to much. Over time, the usage would creep up, but one could be fairly aggressive on deleting cached files for z19. Z19 tiles are most of the time reasonably easy to handle with rendering on the fly so a higher cache miss ratio would matter less. Of cause that would put extra pressure on the renderer, but during normal operations (i.e. if it is not e.g. rerendering everything) it seems to still have a fair amount of capacity left. Also the tile throttling mechanisms seem to work sufficiently well to prevent any "crazy" people from e.g. trying to download all of Europe at z19. So my guess would be that the current server has the resources to deal with z19 although it would cut into spare capacity for handling future growth. Frederik Ramm wrote > But the > style sheet we're currently using doesn't lend itself well to extension > beyond z18, it would require some tweaking. Nothing big though. Imho, the current style sheet, if not perfect, at least works for z19 so I think one could just use it to begin with and then improve it through the normal stylesheet improvemet process. There are by now enough densely mapped areas, where a z19 level offers a real advantage. At z18 too much information gets dropped in the decluttering process. At the moment, when I want to e.g. check if something is already mapped in a densely mapped area, I need to switch into Potlatch where I can zoom to z19 (and beyond). However, if everyone does that, I suspect that would use up much more resources than offering a z19 rendered map. Therefore imho, offering z19 would be possible and a net benefit to OSM, but that is obviously for the server admin team to decide. Kai -- View this message in context: http://gis.19327.n5.nabble.com/Mapnik-at-zoom-19-tp5744338p5744364.html Sent from the General Discussion mailing list archive at Nabble.com. _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
