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Posted to dev@lucene.apache.org by "Nicholas Knize (JIRA)" <ji...@apache.org> on 2018/12/18 15:46:00 UTC
[jira] [Assigned] (LUCENE-8581) Change LatLonShape encoding to use
4 BYTES Per Dimension
[ https://issues.apache.org/jira/browse/LUCENE-8581?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Nicholas Knize reassigned LUCENE-8581:
--------------------------------------
Assignee: Nicholas Knize (was: Ignacio Vera)
> Change LatLonShape encoding to use 4 BYTES Per Dimension
> --------------------------------------------------------
>
> Key: LUCENE-8581
> URL: https://issues.apache.org/jira/browse/LUCENE-8581
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Nicholas Knize
> Assignee: Nicholas Knize
> Priority: Major
> Attachments: LUCENE-8581.patch, LUCENE-8581.patch, LUCENE-8581.patch, LUCENE-8581.patch, LUCENE-8581.patch, LUCENE-8581.patch, LUCENE-8581.patch, LUCENE-8581.patch
>
>
> {{LatLonShape}} tessellated triangles currently use a relatively naive encoding with the first four dimensions as the bounding box of the triangle and the last three dimensions as the vertices of the triangle. To encode the {{x,y}} vertices in the last three dimensions requires {{bytesPerDim}} to be set to 8, with 4 bytes for the x & y axis, respectively. We can reduce {{bytesPerDim}} to 4 by encoding the index(es) of the vertices shared by the bounding box along with the orientation of the triangle. This also opens the door for supporting {{CONTAINS}} queries.
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