[OSM-talk] new Wikidata+OSM data in one RDF database
Eugene Alvin Villar
seav80 at gmail.com
Sat May 13 03:51:46 UTC 2017
So what is the license of this combined database and is this combined
database a whole database or a collective database? Note that Wikidata is
under CC0 while OSM is under ODbL.
On Sat, May 13, 2017 at 12:03 AM, Yuri Astrakhan <yuriastrakhan at gmail.com>
> TLDR: A SPARQL (rdf) database with both OSM and Wikidata data is up for
> testing. Allows massive cross-referenced queries between two datasets. The
> service is a test, and needs a permanent home to stay alive.
> Overpass Turbo is awesome, but sadly it does not have data from Wikidata,
> nor does it support some SQL-like conditions. I have setup a temporary RDF
> database that has both OSM & Wikidata. You can use SPARQL queries to find:
> * All OSM objects with wikidata tag that references a Wikipedia
> disambiguation page. Get the name of the page in first available language
> ru, fr, de, en. http://tinyurl.com/mzlfb26
> * OSM relations with wikidata tag pointing to a person (also tries
> multiple language fallbacks). http://tinyurl.com/m6fh3wx
> * OSM relations with duplicate Wikidata IDs http://tinyurl.com/mvhhogx
> == OSM data structure ==
> osmnode, osmway, osmrel - OSM object prefix, e.g. osmnode:1234
> osmt - tag, e.g. osmt:name:en (only has tags with latin chars, -, _, :,
> osmm - meta data about the object -- type, isClosed, version.
> I try to preserve OSM data without much changes. Every tag's value is
> stored as a string, except for wikidata and wikipedia tags which are
> converted to a URL, the same format as stored in Wikidata.
> osmt:name "Samina";
> osmt:waterway "river";
> osmt:wikidata wd:Q156065;
> osmt:wikipedia <https://de.wikipedia.org/wiki/Samina>;
> osmm:type "w"; #### could be "r", "w", and "n"
> osmm:isClosed false; #### this meta property is only for OSM ways
> osmm:version 24.
> Wikidata data structure is identical to https://query.wikidata.org (see
> == Current limitations ==
> * Only includes OSM objects with either "wikidata" or "wikipedia" tags
> * The OSM data only contains tags with only Latin letters, digits and
> symbols - : _
> * OSM geometry info is not imported, e.g. no center point or bounding box,
> except for osmm:isClosed (true/false) property for ways.
> * Does not include OSM object inheritance data - e.g. cannot query for
> "find a node that is part of a way which is part of a relation that has
> wikidata tag that ..."
> * Wikidata is updated every second, but OSM does not yet update at all,
> imported from a full db dump as of a few days ago.
> talk mailing list
> talk at openstreetmap.org
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