On Wednesday 14 February 2018, Darafei "Komяpa" Praliaskouski wrote: > > > > While this seems a useful test to do i wonder how the timestamp and > > version fields are relevant regarding privacy and personal data > > protection? > > If OSM API were fast enough, it would allow to rather easily group > changes back to changesets. Number of changesets gets you back number > of mappers. Classifying a returning mapper by edit pattern would > allow to get back the geometric median of their edits, which brings > you to knowing where they live.
No, even if the API was infinitely fast limited bandwidth and the possibility to append new edits to existing open changesets would make this impossible. And even if you could identify the changeset a certain feature was last modified in that would still not allow you to conclude which changesets are created by the same user. If you practically want to reverse engineer user identities from a planet file with user info stripped looking at the data itself and mapper specific data charateristics (tag combinations, the way geometries are drawn) would likely be more useful than versions and timestamps. -- Christoph Hormann http://www.imagico.de/ _______________________________________________ dev mailing list email@example.com https://lists.openstreetmap.org/listinfo/dev