A while back I blogged about querying dbpedia with sparql. The queries in that blog were pretty simple. Today, I present a more complicated example.

SELECT ?a, ?long, ?lat WHERE {
?centerlong ;
?centerlat .
?a ?long ;
?lat .
FILTER ( -(?long - ?centerlong)*(?long - ?centerlong) - (?lat - ?centerlat)*(?lat - ?centerlat) > -0.01 )
}
This query gives you all items in the english Wikipedia near where I live.

You could also look for stuff near Gran Canaria or Berlin.