Hi. I think tagging for the renderer is a bad idea.
Essentially you are talking more about render hints, but I think that becomes a matter of preference pretty fast. Especially when OSM data can be rendered in a number of ways. I think it is worth considering what about a road makes you want to render it as a different type of road. - Ben Kelley. On Nov 1, 2012 3:01 PM, "Li Xia" <[email protected]> wrote: > Hey everyone, have an idea about map rendering and want to get your > thoughts. > > One of the challenges is in rendering a useful map for recreational use is > displaying roads, tracks, trails and to some degree water lines at > appropriate zoom levels in more remote regions where the density is lower > compared with urban regions. > > In my opinion, most map service online services or offline vector engine > experience the same issue. Here are some illustrations of the issue, by > comparing Google / OSM / Raster map of the same region: > > Google<http://www.mud-maps.com/li_temp/1211/Screen%20Shot%202012-10-25%20at%204.42.31%20PM.png> > > OSM<http://www.mud-maps.com/li_temp/1211/Screen%20Shot%202012-10-25%20at%204.42.26%20PM.png> > > Raster > map<http://www.mud-maps.com/li_temp/1211/Screen%20Shot%202012-10-25%20at%204.42.22%20PM.png> > > As you can clearly see, at that zoom level, there's no deal on either OSM > or Google maps, where as the raster map is useful. yes you can zoom in on > Google or OSM, but with a smaller viewing port, orientation is more > difficult and you loose that overview which is try handy for trip planning. > > By using a tag specific for rendering purposes, this issue can be > overcome. Rendering engines can take advantage of these tags to "optimise" > rendering of various regions. > > The tags are fairly self explanatory. By tagging a road with > render_as:trunk, this feature can be rendered at the same zoom level as a > trench road. Each class of road will have it's own tag so if a > highway:territory should be rendered at the same zoom level as a primary, > then tag render_as:tertiary. > > What do you guys think? > > Cheers > > Li. > > > _______________________________________________ > Talk-au mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-au > >
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