I think in the US the tiger import used such tags with the aim to remove them once the item has been checked. A massive and still ongoing effort from what I heard.
On 20 July 2020 10:17:25 pm AEST, Andrew Harvey <andrew.harv...@gmail.com> wrote: >On Mon, 20 Jul 2020 at 12:33, David Wales <daviewa...@disroot.org> >wrote: > >> Is there any reason against using a custom tag as a linking key? >> >> e.g. some_import_object_id=123456 >> >> Then when you need to update the data, you can match the key in OSM >with >> the key in the source data. > > >It can be a deterrent to mappers, they may see these external ids and >think >oh I don't understand that, maybe it's special and I shouldn't touch >it, >maybe it is owner by someone else and they update it directly. > >Similar to what Mateusz said, if the community can't verify it, how do >we >know it's right? What should we do if things change on the ground? How >do >we know if the ID still applies to the new tag? In my opinion a better >solution for a private linkage is for the 3rd party database to point >directly to the OSM node/way/relation ID. The external database should >monitor for changes to those IDs and then review after each change if >the >linkage is correct or needs changing. > >Though still the private ID method has been used for imports of the >past, >and I'm not saying it can't be used, but there are disadvantages and >valid >concerns. > >On Mon, 20 Jul 2020 at 14:08, Greg Dutkowski <greg.dutkow...@gmail.com> >wrote: > >> Hi, >> I was thinking of using the ref tag to store the council ID for the >> object, and then the council could use the OSMID in their database. >> What I was looking for was tools or approaches for keeping the two in >> sync. The foreign keys in each system are part of that. >> The conflation tools Andew Harvey pointed to may be a way to go. >> OSM is so big and diverse it is hard to get your head around all of >the >> possibilities, so contacts with people who are making conflation work >would >> be ideal. >> > >I haven't tried those tools before, but my outsider view is that they >are >too low level and not mature. I would love to see something similar to >Maproulette or Tasking Manager from an ease of use and non-technical >setup >point of view but for maintaining linkages with external datasets. > >I wrote recently about a conflation I did to compare government traffic >lights data https://www.openstreetmap.org/user/aharvey/diary/393663 and >I >avoided any coding in that process.
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