Indeed, they absolutely lead to problems. In NYC we've found several problems with IDs already:
1. The IDs that we thought were unqiue are not- some have special "magic values". It turns out two agencies have different IDs for the same building, and we may have wanted to be using the other one the one we chose. 2. When we conflate a building, it's often the case that the mapper will have identified different features than the city did. For example, a building with a garage, the mapper may have identified the garage as a separate building, but not the city. Now we have to decide which building gets the ID. It's a mess. I was against building IDs but other wanted them- I'd have fought against them harder if it happened again today. - Serge On Sat, Dec 14, 2013 at 4:04 PM, Mike N <[email protected]> wrote: > On 12/14/2013 1:31 PM, Clifford Snow wrote: > >> Keeping an id tag does give the advantage that the issuing agency can >> see if we made changes to it. I really think that OSM can work side by >> side with government agencies to improve both of our databases. Right >> now we are mostly just a user of the data. But as we improve and refine >> the data, ours becomes better. For example, this gives fire departments >> better house locations so they can improve their data. >> > > What is their test to see if we (OSM?) have made changes? What if an > OSM user corrects the location, or moves it near a better access entrance, > but doesn't touch the ID? In any case, I would think the government > agency's best query would be "Give me any address object modified since > {last synchronization date}." > > I'll agree with Jason's observation that external IDs in OSM data tend > to discourage corrections and additional contribution by new mappers. > > > > _______________________________________________ > Imports-us mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/imports-us >
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