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https://issues.apache.org/jira/browse/LUCENE-6487?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14561176#comment-14561176
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Karl Wright commented on LUCENE-6487:
-------------------------------------

Simple round-trip tests are trivial, but I won't get to one today, and I agree 
that it is not a blocker for commit.  We can create a separate ticket if you go 
ahead and merge.

re doubles vs. floats: Well, the actual (x,y,z) value needs to be accurate to 
within 1e-12 in order to properly specify various planes etc throughout the 
module.  So I'd be cautious about deliberately reducing precision, since 
geopoint extends vector and plane does too.  We can experiment but...  once 
again, I think a separate ticket would be in order.

> 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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