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https://issues.apache.org/jira/browse/LUCENE-6480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14544180#comment-14544180
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Karl Wright commented on LUCENE-6480:
-------------------------------------

bq. Here's a good discussion and analysis on the maximum error for a geo point 
using the sphere over an earth model.

The article discusses error in *distance* computation.  I'm talking not about 
measuring distance halfway around the earth, but whether a given point is 
properly detected to be within a given shape.



> Extend Simple GeoPointField Type to 3d 
> ---------------------------------------
>
>                 Key: LUCENE-6480
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6480
>             Project: Lucene - Core
>          Issue Type: New Feature
>          Components: core/index
>            Reporter: Nicholas Knize
>
> [LUCENE-6450 | https://issues.apache.org/jira/browse/LUCENE-6450] proposes a 
> simple GeoPointField type to lucene core. This field uses 64bit encoding of 2 
> dimensional points to construct sorted term representations of GeoPoints 
> (aka: GeoHashing).
> This feature investigates adding support for encoding 3 dimensional 
> GeoPoints, either by extending GeoPointField to a Geo3DPointField or adding 
> an additional 3d constructor.



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