2009/6/9 Nop <[email protected]>: > > Hi! > > Dave Stubbs schrieb: >> >> Which just tells you those aren't the "appropriate tags" of which matt >> speaks. >> >> Careful selection of tags means that nothing existing needs to change, >> unless it's to make life easier for the user by adding filtering >> features. > > That is exactly the problem. When you add things that are not supposed to be > visible by default, as they describe past or future objects, the items are > there. And by no amount of tagging can you make them go away, that requires > awareness of your tags and active filtering on part of all applications. > > Or can you please describe how an "appropriate" tag should look like e.g. > for an object that will be torn down next year, so that it disappears from > the map at the appropriate time without changing the renderers? >
Umm.. you can't. And why would you want to? It's a wiki. You can edit it. highway=motorway demolition_date=2009-09-01 then, on 1st September a mapper can come along, actually check the thing /was/ demolished (possibly prompted by some clever application) and replace with: highway=demolished_motorway demolition_date=2009-09-01 18:03:05+00 Anybody who wants to try to be clever can add knowledge of the demolition_date tag to their renderer/router. Anybody who doesn't will have the motorway disappear from their maps when they next update. Same goes for construction... highway=under_construction_motorway construction_complete_date=2009-10-12 to highway=motorway construction_complete_date=2011-08-05 The unaware renderer will see the motorway when it gets an update. The aware renderer will start displaying the motorway about 2 years too early, although you can expect the mapper to have updated the expected completion date by then as no doubt the political fallout of yet another multi-million pound government overrun gets splashed over the papers. None of this stops the ways appearing in the editor, but as has been mentioned, there's more than one reason why that could be a bad idea anyway. This kind of thing comes under "unless it's to make life easier for the user by adding filtering features". Dave PS. I'm not actually advocating those particular tags names, or even saying they're a terrible idea, or that governments can't deliver big projects on time :-) _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
