For relations, I simply add "members" in addition to "tags". The members are stored as 3 different predicates: "osmm:has", "osmm:has:_", and "osm:has:..." (where the ... represents any "valid" label - same rules as for the tag key). The object (value) of the statement is a link to another OSM object. Copying from wiki: # this relation contains a way with blank label osmm:has osmway:2345 ; # this relation contains a node with a non-ascii label osmm:has:_ osmnode:1234 ; # this relation contains a relation labelled as "inner" osmm:has:inner osmrel:4567 ;
See https://wiki.openstreetmap.org/wiki/Wikidata%2BOSM_SPARQL_query_service#How_OSM_data_is_stored At this point there is no "osmm:loc" stored for relations. I wonder if it is possible to calculate it dynamically using the geo functions built into Wikidata's engine (Blazegraph + customizations). If not, I might need to do some relations postprocessing, as well as automatic updating. On Mon, Aug 14, 2017 at 1:39 PM, François Lacombe <fl.infosrese...@gmail.com > wrote: > Hi > > 2017-08-14 11:18 GMT+02:00 mmd <mmd....@gmail.com>: > >> Hi, >> >> Am 13.08.2017 um 19:49 schrieb Yuri Astrakhan: >> >> > * all ways now store "osmm:loc" with centroid coordinates, making it >> > possible to crudely filter ways by location >> >> out of curiosity, can you say a few words on how your overall approach >> to calculate centroids for ways? As we all know it's an endless pain to >> get that information out of minutely diffs :) >> > > Out of curiosity, can you explain how relations are processed also ? > Is this relevant to look for a representative point for a relation or a > more complex search have to be done for specific members (roles) ? > > I don't know Shapely enough to say if it can handle this standalone and it > would be greate to elaborate a bit what is done from line 260 to 280 of > osm2rdf.py :) > > > All the best > > François > > _______________________________________________ > talk mailing list > talk@openstreetmap.org > https://lists.openstreetmap.org/listinfo/talk > >
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