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https://issues.apache.org/jira/browse/LUCENE-6699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14703427#comment-14703427
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Karl Wright commented on LUCENE-6699:
-------------------------------------
Ok, I was able to isolate one case of failure and incorporate it into a simple
test:
{code}
// Test case from BKD
c = new GeoCircle(PlanetModel.SPHERE, -0.765816119338, 0.991848766844,
0.8153163226330487);
GeoPoint p1 = new GeoPoint(0.7692262265236023, -0.055089298115534646,
-0.6365973465711254);
assertTrue(c.isWithin(p1));
xyzb = new XYZBounds();
c.getBounds(xyzb);
assertTrue(p1.x >= xyzb.getMinimumX() && p1.x <= xyzb.getMaximumX());
assertTrue(p1.y >= xyzb.getMinimumY() && p1.y <= xyzb.getMaximumY());
assertTrue(p1.z >= xyzb.getMinimumZ() && p1.z <= xyzb.getMaximumZ());
{code}
Now I can look at it. ;-)
> 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
>
>
> 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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