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https://issues.apache.org/jira/browse/LUCENE-6480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14542081#comment-14542081
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Michael McCandless commented on LUCENE-6480:
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I'm not following closely here (yet!) but just wanted to say: we shouldn't feel
like we must use at most 8 bytes to encode lat+lon+altitude, since we are
indexing into arbitrary byte[] terms in the postings ...
I mean, the fewer bytes the better, but there's not a hard limit of 8.
> 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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