On Fri, 20 Apr 2012, Martin Koppenhoefer wrote: > In some regions of the world OSM is already in a state where many of > the map modifications are not due to missing or wrong data, but result > from actual changes in the real world, e.g. a building gets > demolished. > > Given that we store not only the actual state of the DB but also > record all kinds of changes that the mappers apply, I wonder if we > shouldn't agree on some formal mechanism to distinct the changes where > the map gets updated to the real world from those where the edit is > done to correct mapping errors, to increase the level of detail or to > store them for the first time. > > Since the introduction of API 0.6 we have in theory one powerful tool > where this detail can already be associated to the edit: the changeset > comments. The only missing link for effective automated evaluation > would be an agreement on a formal way of storing information there > (and quite some discipline in structuring your edits and uploads ;-) > ). E.g. we could use hashtags to distinguish free text from formal > comments ( e.g. #demolishion , #new_construction ,etc)
Changeset comments/tags are very problematic because they're not fixable once you realize you made a mistake. > An alternative could be, e.g. for a building that was demolished, to > explicitly "map" this. Given an object tagged with building=yes we > could change the tag to building=demolished, upload to the server, and > in a second step delete the object and upload again. The deletion and > second upload could even be automated easily in the editors, if we > could agree on something like this. > > As an advantage with the second method you would not need to structure > your edits and changesets in a special way, I'd expect to get more > reliable results and less oversight with this approach. > > Is someone already using a scheme for this kind of information? was: prefixes and keeping geomtery which also helps to prevent somebody too eager from redrawing from imagery (which ahs certainly happened multiple times around here). :) -- i. _______________________________________________ Tagging mailing list Tagging@openstreetmap.org http://lists.openstreetmap.org/listinfo/tagging
