[talk-au] Active Australian OSM contributors in light of CT/license changes

80n 80n80n at gmail.com
Thu Jul 7 15:01:25 BST 2011


On Thu, Jul 7, 2011 at 1:15 PM, Andrew Harvey <andrew.harvey4 at gmail.com>wrote:

>
> The more who contribute directly to fosm rather than OSM, the less the work
> there will be for fosmers dealing with duplicated data resulting from
> merges. If it becomes a big problem, I think we should be able to do manual
> merges of OSM data into fosm, assuming we have the volunteers. Otherwise we
> can just leave OSM data behind if no one is longer to merge it into fosm.
>

The probability of collisions is quite small in practice.  We are able to
automatically sync all OSM updates into fosm.org in near real time.
Consequenly fosm.org already has more content than OSM and the gap will
continue to widen.  It will become a massive gulf if OSM ever has the
courage to mass delete all non-ODbL licensed content, but I can't see that
happening any time soon.

The worst case for a collision is an edit in OSM that conflicts with an
earlier edit made to the same element in the fosm database.  In this case we
place the OSM edit in a conflict log and preserve the fosm edit.

Other kinds of conflict include the same feature being added to both OSM and
fosm independently.  This will result in the feature being duplicated in
fosm, but it's easy to manually delete such artifacts when they are noticed,
retaining whichever is the best one.

My largest concern is with piecemeal replacement of non-ODbL licensed
content in OSM with inferior quality tracing.  This will appear as
legitimate edits to the fosm sync process and will result in fosm being
degraded needlessly.  We've talked about mechanisms for watching areas where
this might happen and for users who might be doing this.  We can revert such
edits in fosm and get the good stuff back providing we notice that it has
happened.

80n
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