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From "Itamar Syn-Hershko (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-4186) Lucene spatial's "distErrPct" is treated as a fraction, not a percent.
Date Sun, 02 Sep 2012 22:02:08 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-4186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13447037#comment-13447037
] 

Itamar Syn-Hershko commented on LUCENE-4186:
--------------------------------------------

distErrPct makes sense to me - it makes more sense to talk about the expected error rate rather
than actual given precision. Hence the name "Distance Error Percentage" makes perfect sense,
although is tough to make an acronym of...

And while at it throw a bug fix in: SpatialArgs.toString should multiply distPrecision by
100, not divide it.
                
> Lucene spatial's "distErrPct" is treated as a fraction, not a percent.
> ----------------------------------------------------------------------
>
>                 Key: LUCENE-4186
>                 URL: https://issues.apache.org/jira/browse/LUCENE-4186
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: modules/spatial
>            Reporter: David Smiley
>            Assignee: David Smiley
>            Priority: Critical
>             Fix For: 4.0
>
>
> The distance-error-percent of a query shape in Lucene spatial is, in a nutshell, the
percent of the shape's area that is an error epsilon when considering search detail at its
edges.  The default is 2.5%, for reference.  However, as configured, it is read in as a fraction:
> {code:xml}
>     <fieldType name="location_2d_trie" class="solr.SpatialRecursivePrefixTreeFieldType"
>                distErrPct="0.025" maxDetailDist="0.001" />
> {code}

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