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From "Karl Wright (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-6699) Integrate lat/lon BKD and spatial3d
Date Sat, 22 Aug 2015 01:15:45 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-6699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14707749#comment-14707749
] 

Karl Wright commented on LUCENE-6699:
-------------------------------------

Ok, [~mikemccand], I've confirmed this picture.

The XYZ solid's edges of intersection with the planet have no interaction with the circle
edge, and are all considered to be within the GeoCircle's area.  So the relationship seems
to be correct.

I'll think on this overnight and make a final recommendation in the morning.  Or maybe I better
ask you this: if the system behaved exactly as it does now, what do you think the right result
would be to return from the GeoPoint query?

> Integrate lat/lon BKD and spatial3d
> -----------------------------------
>
>                 Key: LUCENE-6699
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6699
>             Project: Lucene - Core
>          Issue Type: New Feature
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>         Attachments: Geo3DPacking.java, LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch,
LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch,
LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch,
LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch,
LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch,
LUCENE-6699.patch, LUCENE-6699.patch, LUCENE-6699.patch
>
>
> I'm opening this for discussion, because I'm not yet sure how to do
> this integration, because of my ignorance about spatial in general and
> spatial3d in particular :)
> Our BKD tree impl is very fast at doing lat/lon shape intersection
> (bbox, polygon, soon distance: LUCENE-6698) against previously indexed
> points.
> I think to integrate with spatial3d, we would first need to record
> lat/lon/z into doc values.  Somewhere I saw discussion about how we
> could stuff all 3 into a single long value with acceptable precision
> loss?  Or, we could use BinaryDocValues?  We need all 3 dims available
> to do the fast per-hit query time filtering.
> But, second: what do we index into the BKD tree?  Can we "just" index
> earth surface lat/lon, and then at query time is spatial3d able to
> give me an enclosing "surface lat/lon" bbox for a 3d shape?  Or
> ... must we index all 3 dimensions into the BKD tree (seems like this
> could be somewhat wasteful)?



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