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From "David Smiley (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-5771) Review semantics of SpatialOperation predicates
Date Tue, 17 Jun 2014 15:55:02 GMT
David Smiley created LUCENE-5771:
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             Summary: Review semantics of SpatialOperation predicates
                 Key: LUCENE-5771
                 URL: https://issues.apache.org/jira/browse/LUCENE-5771
             Project: Lucene - Core
          Issue Type: Improvement
          Components: modules/spatial
            Reporter: David Smiley


SpatialOperation (which I wish was named SpatialPredicate) is a bunch of predicates -- methods
that return true/false based on a pair of shapes.  Some of them don't seem to be defined in
a way consistent with their definitions on ESRI's site:
http://edndoc.esri.com/arcsde/9.1/general_topics/understand_spatial_relations.htm  (which
is linked as a reference, and is in turn equivalent to OGC spec definitions, I believe).

Problems:
* the definitions make no mention of needing to have area or not, yet some of our predicates
are defined as to require area on either the indexed or query shape.
* the definitions make a distinction of the boundary of a shape, yet in Lucene-spatial, there
is none.  That suggests our predicates are wrongly chosen since there *are* official predicates
that are boundary-neutral -- namely "Covers" and "CoveredBy" in lieu of Contains and Within,
respectively.  If we don't rename our predicates, we should at least support the correct predicates
names!
* Overlaps appears totally wrong. It should be defined as indexedShape.relate(queryShape)
== Intersects  (and thus not Within or Contains or Disjoint).  It's presently defined as the
same as Intersects plus the query shape needing area.




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