On 28 September 2013 20:52, Rob Nickerson <rob.j.nicker...@gmail.com> wrote: > Oh I should add that I am a fan of source tags on the objects myself so I > add a "source:postcode=Land Registry 'Price Paid' data" tag (or =ONS > Postcode Centroids) to my edits. Not everyone agrees that source tags should > be added to the objects, preferring instead to add them to the changeset > comment.
I use a mixture of both, depending on the context. Both are flawed, though. Adding to objects doesn't work well when different tags have different sources, and the geometry may have a different one too. It is also very vulnerable to people replacing the whole source with theirs. Adding it to changeset comments means it doesn't survive splits and merges. The database has no knowledge that these actually happened and doesn't record the audit trail necessary to find the true provenance of a node, way or relation. (For this reason, any mechanical redaction is likely to be quite flawed.) This lack of good traceability does worry me, as I see one of the biggest threats to a cloud sourced project like this is people getting over enthusiastic and importing copyright data, possibly in such small individual amounts that no alarms sound, but when aggregated, enough to get a copyright owner angry. My feeling is that the upcoming generation of contributors isn't so steeped in the concept of a map that is untainted by material with restrictive copyrights, so will use the easiest way of getting the data they want added. The most important reason for sources may be to limit what has to be taken down when a take down notice is received. _______________________________________________ Talk-GB mailing list Talk-GB@openstreetmap.org https://lists.openstreetmap.org/listinfo/talk-gb
