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https://issues.apache.org/jira/browse/LUCENE-6632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14609494#comment-14609494
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Karl Wright commented on LUCENE-6632:
-------------------------------------
We're interested in distance from the line going through the poles.
"upperPoint" is just a certain arc distance from the center, going along a
plane that represents a longitudinal slice. "lowerPoint" goes the opposite
direction. You really can't tell which is farther from the line going through
the poles until you check.
> Geo3d: More accurate way of computing circle planes
> ---------------------------------------------------
>
> Key: LUCENE-6632
> URL: https://issues.apache.org/jira/browse/LUCENE-6632
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/spatial
> Reporter: Karl Wright
> Attachments: LUCENE-6632.patch
>
>
> The Geo3d code that computes circle planes in GeoPath and GeoCircle is less
> accurate the smaller the circle. There's a better way of computing this.
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