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https://issues.apache.org/jira/browse/LUCENE-7970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16180738#comment-16180738
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Ignacio Vera commented on LUCENE-7970:
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Hi [~daddywri],
Apologies for not being so reactive as I would like to but I have a pretty busy
week.
I want to add the shape to the random generator and include it in the
relationship tests. I think I will be able to provide you with a patch
tomorrow or the day after with this feature.
I am actually having difficulties to translate the accuracy of the shape to
values on the planet model. Is there a way to translate accuracy to values on
the planet? e.g is accuracy of 1e-3 translated to accurate to 1e-3 degrees?
I want to make accuracy random as well so I would like to use realistic values.
Thanks!
> Add a Geo3d shape that models an exact circle, even when the planet model is
> not a sphere
> -----------------------------------------------------------------------------------------
>
> Key: LUCENE-7970
> URL: https://issues.apache.org/jira/browse/LUCENE-7970
> Project: Lucene - Core
> Issue Type: Improvement
> Components: modules/spatial3d
> Reporter: Ignacio Vera
> Assignee: Karl Wright
> Attachments: circle.jpg, LUCENE-7970-exact.diff, LUCENE_7970.patch,
> LUCENE-7970.patch, LUCENE-7970-proposed.patch,
> LUCENE-7970_testBearingPoint.patch
>
>
> Hi [~Karl wright],
> How circles are currently build do not behave very well when the planet model
> is not an sphere. when you are close to the border in WGS84 you might get
> false positves or false negatives when checking if a point is WITHIN. I think
> the reason is how the points to generate the circle plane are generated which
> assumes a sphere.
> My proposal is the following:
> Add a new method to PlanetModel:
> public GeoPoint pointOnBearing(GeoPoint from, double dist, double bearing);
> Which uses and algorithm that takes into account that the planet might not be
> spherical. For example Vincenty's formulae
> (https://en.wikipedia.org/wiki/Vincenty%27s_formulae).
> Use this method to generate the points for the circle plane. My experiments
> shows that this approach removes false negatives in WGS84 meanwhile it works
> nicely in the Sphere.
> Does it make sense?
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