Re: [Wikidata-l] Precision of globe coordinates

2015-01-13 Thread Paul Houle
Big picture it is important to recognize the importance of geodetic datums. The market leading datum is WGS84 or GPS because it is (1) good enough for military work, and (2) GPS hardware is everywhere. Before the space age, geodetic datums were determined by optical observations forming a

Re: [Wikidata-l] Disambiguating property [was: Freebase like API with an OUTPUT feature}

2015-01-13 Thread Emw
Hi James, My mistake, I should have linked to https://www.wikidata.org/wiki/Property_talk:P1647, which includes the following in the 'Examples' section of the documentation template: Note: it is not valid to declare subproperties of instance of (P31) (rdf:type), subclass of (P279)

Re: [Wikidata-l] Precision of globe coordinates

2015-01-13 Thread Serge Wroclawski
For places where precision is required, has anyone given thought to using Geohash keys rather than lat/lon? The benefits of geohashing here is that you get both the location and also the precision values in a single object. As a secondary benefit, it can be used to index on a database with more

Re: [Wikidata-l] Freebase's incompatible types and Property description permissions

2015-01-13 Thread Joe Filceolaire
Country (p17) should be used for a general affiliation. Dublin has a general affiliation with Ireland. On the other hand City of Dublin is in the administrative territorial entity Dublin region which is in the administrative territorial entity Republic of Ireland which is on the geographical