Re: [OSM-talk] Proposed mechanical edit: Empty Relations
Since there still seems to be debate about some cases, would anyone object to type=multipolygons and those missing type=* tags that are over a week and others over a year? Then we can debate the validity of a relation not referenced by anything in the database and not referencing anything itself. From: Paul Norman [mailto:penor...@mac.com] Subject: [OSM-talk] Proposed mechanical edit: Empty Relations Through editor errors or other mistakes there are a number of relations in OSM which have no members. I propose a mechanical edit to delete these where they are not members of some other way. My proposed procedure, documented at http://wiki.openstreetmap.org/wiki/Mechanical_Edits/pnorman_imports is to identify these with my pgsnapshot database and delete them if they aren't referenced by any other relation. If they are referenced by another relation I will investigate them and deal with them manually. I've investigated a few of them and they appear to be caused by people deleting ways from multipolygons but not deleting the relation. I don't want to investigate all 5200 by hand so I'm proposing the mechanical edit. I will filter out ones touched in the last 24 hours to avoid conflicting with anyone. If this goes ahead and anyone wishes to opt out for some unknown reason let me know. It would not be possible to opt out by area as an empty relation has no geodata associated with it. I was tempted to do this without posting, but it does fall under http://wiki.openstreetmap.org/wiki/Mechanical_Edit_Policy and therefore requires consultation. A quick sampling of the ones most recently created indicates that they are mainly made with JOSM, including recent versions. JOSM devs may want to make it harder to accidentally create a relation with no members. ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
[OSM-talk] Proposed mechanical edit: Empty Relations
Through editor errors or other mistakes there are a number of relations in OSM which have no members. I propose a mechanical edit to delete these where they are not members of some other way. My proposed procedure, documented at http://wiki.openstreetmap.org/wiki/Mechanical_Edits/pnorman_imports is to identify these with my pgsnapshot database and delete them if they aren't referenced by any other relation. If they are referenced by another relation I will investigate them and deal with them manually. I've investigated a few of them and they appear to be caused by people deleting ways from multipolygons but not deleting the relation. I don't want to investigate all 5200 by hand so I'm proposing the mechanical edit. I will filter out ones touched in the last 24 hours to avoid conflicting with anyone. If this goes ahead and anyone wishes to opt out for some unknown reason let me know. It would not be possible to opt out by area as an empty relation has no geodata associated with it. I was tempted to do this without posting, but it does fall under http://wiki.openstreetmap.org/wiki/Mechanical_Edit_Policy and therefore requires consultation. A quick sampling of the ones most recently created indicates that they are mainly made with JOSM, including recent versions. JOSM devs may want to make it harder to accidentally create a relation with no members. ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Proposed mechanical edit: Empty Relations
On 4/13/2012 5:12 AM, Paul Norman wrote: I will filter out ones touched in the last 24 hours to avoid conflicting with anyone. Could this be extended to 30 days, or at least a week? I remember creating a set from a survey on one weekend, and finishing it the following weekend. I think part of this included the empty relation, although I would just go ahead and populate the relation immediately now that I know what I'm doing. ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Proposed mechanical edit: Empty Relations
On 13 April 2012 11:12, Paul Norman penor...@mac.com wrote: Through editor errors or other mistakes there are a number of relations in OSM which have no members. I propose a mechanical edit to delete these where they are not members of some other way. My proposed procedure, documented at http://wiki.openstreetmap.org/wiki/Mechanical_Edits/pnorman_imports is to identify these with my pgsnapshot database and delete them if they aren't referenced by any other relation. If they are referenced by another relation I will investigate them and deal with them manually. I've investigated a few of them and they appear to be caused by people deleting ways from multipolygons but not deleting the relation. I don't want to investigate all 5200 by hand so I'm proposing the mechanical edit. I will filter out ones touched in the last 24 hours to avoid conflicting with anyone. This thread comes up every some time (http://lists.openstreetmap.org/pipermail/dev/2009-August/016658.html, http://lists.openstreetmap.org/pipermail/talk/2010-November/055075.html). In 2009 I ran a very similar operation with 4.5k relations deleted as discussed in the first thread I linked. The lesson from it was that some relations are referenced from outside of the database, mainly from the OSM wiki. Those should not be deleted automatically either or it'll upset some users. Cheers ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
Re: [OSM-talk] Proposed mechanical edit: Empty Relations
Hi Norman, Am Freitag, den 13.04.2012, 02:12 -0700 schrieb Paul Norman: Through editor errors or other mistakes there are a number of relations in OSM which have no members. I propose a mechanical edit to delete these where they are not members of some other way. My proposed procedure, documented at http://wiki.openstreetmap.org/wiki/Mechanical_Edits/pnorman_imports is to identify these with my pgsnapshot database and delete them if they aren't referenced by any other relation. In the following mail already mentioned by andrzej I've anounced a wikipage about the reasons of empty relations. http://lists.openstreetmap.org/pipermail/talk/2010-November/055075.html Here's the wiki page: http://wiki.openstreetmap.org/wiki/Empty_relations In the following weeks I've talked to many osm editors that created lot of empty relations and I've deleted those that obviously have been created accidently. I can not remember how many relations I've deleted since Nov 2010. Maybe around 35000 or more. I've restore several relations, too, when I thought the empty relation was the result of wrong merge conflict resolution. (see wiki page for details) I'm still updating the statistic page from time to time: http://www.h-renrew.de/h/osm/osmchecks/02_Relationstypen/empty_relations.html and delete the relations with the rules I've written down on the wiki page. I've never got an answer from the Naptan importers. The naptan import is the largest single creator of empty relations. Regards Werner ___ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk
