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sparqlunicorn / sparqlunicornGoesGIS

SPARQLing Unicorn QGIS Plugin (Documentation: https://sparqlunicorn.github.io/sparqlunicornGoesGIS/)
https://plugins.qgis.org/plugins/sparqlunicorn/
GNU General Public License v2.0
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Add Default Queries #2

Closed situx closed 4 years ago

situx commented 4 years ago

It would be a good idea to add default queries to the plugin. This requires:

  1. A query to find out some/all geospatial concepts of a triple store, sth. like this: SELECT DISTINCT ?class WHERE{ ?item wdt:P31 ?class. ?item wdt:P625 ?coord.} Could be a performance issue though.

  2. A query to select some/all direct properties of individuals of the class in a certain area as a default query. Input: Concept (from previous query), boundingbox or concept like country, language select ?rel ?relLabel WHERE { ?con wdt:P31 CONCEPT . ?con wdt:P625 ?coord . ?con wdt:P17 AREA . (or Boundingbox query part) ?con ?rel ?val . SERVICE wikibase:label { bd:serviceParam wikibase:language LANGUAGE . } } GROUP BY ?rel ?relLabel ORDER BY ?relLabel

Ideally, a user could choose or search a list of geospatial concepts of the respective triple store and with the provision of boundingbox or country get a GeoJSON layer into QGIS. This would increase the accessibility of the plugin to users who are not able to write SPARQL.

florianthiery commented 4 years ago

Yes, we should implement sth like that. In the spirit of the SPARQLing Unicorn