[OSM-talk] Overpass API / Overpass QL: center (and centroid) function?

[Stefan Keller]

Hi,

I'm trying to get a list of point features only (as GeoJSON or XML).
This could serve as input e.g. to uMap. The problem is that the query
returns points but also areas. This is actually correct - but I want
these areas converted to point geometries too (centered, like
ST_Centroid).

I then found the modifcator/keyword "center" in the Overpass QL [1].
But I still get polygons. See the query [2] below.

Any ideas?

--Stefan


[1] http://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_QL

[2] http://overpass-turbo.osm.ch/ oder http://overpass-turbo.eu/

*** Dairy (Käserei) Query ways/areas only... ***

[out:json]
[timeout:25]
;
(
  node["shop"~"dairy"]
  (45.70234306798271,5.8831787109375,47.864773955792245,10.590820312499998);
  way["shop"~"dairy"]
  (45.70234306798271,5.8831787109375,47.864773955792245,10.590820312499998);
);
out meta center qt;
>;
out meta center qt;