Luc Van den Troost wrote: > Perhaps you can explain how 'abandoned' and 'disused' SHOULD be > interpreted in relation to the rendering rules. As far as I have seen, > the wiki pages about railways do not mention this.
I can only explain at the moment how these situations handled on the mapnik map. How they *should* be shown, is another matter. Opinions differ. Personally, I don't need to see a (former) railroad on the map, when the tracks are physically gone, especially if it's converted to a cycleway. > If both should appear on the map, then probably 'historical tracks' that > are no longer visible should not be mapped, or at least not this way. Currently, mapnik renders railway=disused/abandoned/construction all with the exact same style: a dotted line. > Historical items then might be mapped in a different way that is usefull > for, for instance, a separate rendering or different layer. That would > not only be the case for historical railway tracks, but as well for > historical city walls, canals, gates, old river quai and docks, ... that > all have influenced city development. But that is another discussion. Hard to solve, unless *every* data user starts to understand and process something like date_start/date_end tags. > Another 'historical' point is that it is a pitty that OSM doesn't offer > a kind of 'time-machine'. On one side it would be nice to see the growth > of OSM that way, on the other side the map we are currently making will > be historical one day. If - for instance - Doel would be broken down for > harbour expansion, going back in time then would show how it was before, > same would be if the 'hedwigepolder' on the other side of the border > would be flooded again. But again, that is just a side remark and > another discussion. Don't forget the Prosperpolder, where works are already under way to open it to the Schelde. I fear the infrastructure needed to store, process and show OSM as it was in a particular point in time, is not easy to construct. The sheer data volume means you need quite some processing capacity, both in CPU and storage. -- Lennard _______________________________________________ Talk-be mailing list Talk-be@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk-be
