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Posted to dev@lucene.apache.org by "David Smiley (JIRA)" <ji...@apache.org> on 2014/07/08 22:20:06 UTC
[jira] [Resolved] (LUCENE-5771) Review semantics of
SpatialOperation predicates
[ https://issues.apache.org/jira/browse/LUCENE-5771?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
David Smiley resolved LUCENE-5771.
----------------------------------
Resolution: Fixed
Fix Version/s: 4.10
5.0
> 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
> Assignee: David Smiley
> Fix For: 5.0, 4.10
>
> Attachments: LUCENE-5771_SpatialOperation_semantics.patch, LUCENE-5771_SpatialOperation_semantics.patch
>
>
> 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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