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https://issues.apache.org/jira/browse/LUCENE-6487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14565926#comment-14565926
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Karl Wright commented on LUCENE-6487:
-------------------------------------
I'll have a look. Please bear in mind that trig functions and their inverses,
if done in sequence enough, may well wander pretty far off of the original
values, so there may be nothing wrong with your test. But I will make sure of
that.
> Add WGS84 capability to geo3d support
> -------------------------------------
>
> Key: LUCENE-6487
> URL: https://issues.apache.org/jira/browse/LUCENE-6487
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/spatial
> Reporter: Karl Wright
> Attachments: LUCENE-6487.patch, LUCENE-6487.patch, LUCENE-6487.patch,
> LUCENE-6487.patch
>
>
> WGS84 compatibility has been requested for geo3d. This involves working with
> an ellipsoid rather than a unit sphere. The general formula for an ellipsoid
> is:
> x^2/a^2 + y^2/b^2 + z^2/c^2 = 1
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