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https://issues.apache.org/jira/browse/LUCENE-4342?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13444403#comment-13444403
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David Smiley commented on LUCENE-4342:
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Thanks for the bug report. I think there may be a level off-by-one error, so
maybe that's it, but I haven't doug into your bug report yet but will soon.
> Issues with prefix tree's Distance Error Percentage
> ----------------------------------------------------
>
> Key: LUCENE-4342
> URL: https://issues.apache.org/jira/browse/LUCENE-4342
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/spatial
> Affects Versions: 4.0-ALPHA, 4.0-BETA
> Reporter: Itamar Syn-Hershko
> Assignee: David Smiley
> Attachments: unnamed.patch
>
>
> See attached patch for a failing test
> Basically, it's a simple point and radius scenario that works great as long
> as args.setDistPrecision(0.0); is called. Once the default precision is used
> (2.5%), it doesn't work as expected.
> The distance between the 2 points in the patch is 35.75 KM. Taking into
> account the 2.5% error the effective radius without false negatives/positives
> should be around 34.8 KM. This test fails with a radius of 33 KM.
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