I'm a little bit worried about using admin_level, as it has connotations of control, not just level. It could be misinterpreted as who controls an airfield, rather than how important it is.
What you're trying to do here is give a renderer explicit hints on how important something is, and what zoom level it should be on. This concept can be used for many things other than airfields. I'd prefer to see a generic importance tag of some sort (render_level, or render_importance) than can be used in many places, rather than an airfield specific one. You can still have specific rules for deciding how to apply the level, but if we can use the hinting for other things, and renderers can implement it only once, it's more likely to be accepted. Maybe something like Render_hint = 3, hint type=aerodrome if we do need to differentiate between the hint types. I think this concept is important. People can come up with all sorts of algorithms for ranking things according to all sorts of rules, and none of them will work on every occasion. We need some explicit method of hinting to a renderer that a certain object is more or less important than it might otherwise appear. Or that this one of the six or seven nearly identical objects in a certain area is the one that should be rendered if you don't have room to label them all. The renderer can always ignore the hint if it likes. This kind of prioritisation is exactly the sort of thing that people can do really well, and machines suck at. Stephen On 16 June 2010 14:52, Zeke Farwell <ezeki...@gmail.com> wrote: > Does anyone see a problem with simply using the same admin_level tag > currently in use with boundary=administrative, in combination with > aeroway=aerodrome? A new aerodrome_importance tag could be created, but > admin_level is already in use so why not make it multi-purpose. All we'd > have to do is come up with the appropriate zoom levels for each admin_level, > request that this combination be added to the Mapnik stylesheet, and then > we'd need a chart on the wiki similar to the admin_level chart for > boundaries to be filled in by mappers in each country. Seems reasonable to > me…. > Zeke > > _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
