On 22/05/2015 5:32 PM, Martin Koppenhoefer wrote:
Am 22.05.2015 um 09:04 schrieb Frederik Ramm <[email protected]>: Yes, of course. If there is no bridge left at all then we'd simply delete - or refrain from mapping - the bridge (rather than create an object saying there was a bridge but it's gone now). Incidentally this means that OSM is not suitable for use cases like "let's plot all the damage done by disaster <X>" because if the damage is obliteration then there will be nothing in OSM that we can plot.
The undamaged sections can be plotted in OSM .. the missing sections can be added when they are repaired/replaced. If a bridge is damaged .. then the road remains and can be plotted.
it depends on the structure of the bridge but if it is/was a stone bridge or steel or concrete (i.e. a big serious bridge) it will typically not completely vanish, even if heavily damaged and temporarily unusable the situation will still be very different to no bridge at all (repairing will often be possible and done, and be much less work compared to starting from scratch, eg foundations) Few here will remember WW II ;-) but we all know the pictures. In 1945, Germany, after the war, reconstruction was less work than starting from scratch because even if it looked like total destruction, the streets impassable and blocked by rubble, but the sewage system, underground infrastructure, overground city layout, were still mostly sane, and allowed for much faster reconstruction than new development of a settlement would have been. Actually more buildings and structure has break destroyed in the time after the war (50ies/60ies) with the will of modernization than had been destroyed in the war.
For much the same reason .. things damaged will be repaired/replaced. The reasons why those things were there are the reasons why they will reappear in the same place. Possibly better built. Some years ago there was a bushfire near me. It burnt out quite a few old wooden bridges. Those roads were closed for quite some time. But the bridges were replaced.. this time with concrete ones .. new foundations included. The bridges are in the same locations, they may have moved 1 metre .. and might be a bit wider, guard rails further apart, but in general the same. Much quicker and cheaper to repair/replace sections that are damaged than place a new road + bridges elsewhere. Under those conditions .. marking something damaged maybe best practice. When the repair/replacement is completed OSM can remove the tagging of damaged. _______________________________________________ Tagging mailing list [email protected] https://lists.openstreetmap.org/listinfo/tagging
