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https://issues.apache.org/jira/browse/LUCENE-6776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14728798#comment-14728798
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Karl Wright commented on LUCENE-6776:
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The analysis: The Z bound is unaffected. The X and Y bounds, however, are
being computed improperly due to a wrong assumption I made when deriving the
method for computing them. They work for spheres accurately, and they work with
increasing inaccuracy for increasingly non-spherical ellipsoids.
The only fix is to derive an accurate formula for the min/max in X and in Y. I
believe this is doable, but I'll have to actually do it before I'm sure. Due
to other time constraints, this is not likely to be ready for at least a day.
Meanwhile, the value of FUDGE_FACTOR chosen is adequate for WGS84, but will not
stand up to any planet model that is more oblate than that. When a true fix is
in place, FUDGE_FACTOR may be reducible to a very small value.
> Randomized planet model shows up additional XYZBounds errors
> ------------------------------------------------------------
>
> Key: LUCENE-6776
> URL: https://issues.apache.org/jira/browse/LUCENE-6776
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/spatial
> Reporter: Karl Wright
> Attachments: LUCENE-6776.patch
>
>
> Adding randomized PlanetModel construction causes points to be generated
> inside a shape that are outside XYZBounds. [~mikemccand] please take note.
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