Hello,
I have loaded some spatial data in Virtuoso Open Source 7.1. The
geometries are polygons and multipolygons. The geometries are adjacent
to each other, they do not overlap. However, when I tried a SPARQL query
with a FILTER bif:st_within, to get the polygon that contains a certain
point that I specify in the query, the first test I performed returned
two geometries. I do not use the tolerance parameter of st_within, so
that should be 0.
The geometries are exported from PostGIS and I can draw the original
geometries in a map. Doing that gives me a visual confirmation that the
query should only return one geometry.
Based on my simple test, I get the impression that st_within works with
the bounding box of a geometry, not the geometry itself. Can this be
confirmed or denied?
Regards,
Frans
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Frans Knibbe
Geodan
President Kennedylaan 1
1079 MB Amsterdam (NL)
T +31 (0)20 - 5711 347
E frans.kni...@geodan.nl
www.geodan.nl <http://www.geodan.nl> | disclaimer
<http://www.geodan.nl/disclaimer>
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