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Ignacio Vera commented on LUCENE-7970: -------------------------------------- Thanks [~karl wright], For the documentation I took the method from, it seems that it might have problems for antipodal points. Other than that, I will devise a test to shows the limits in distance and maybe values for planet model. One more observation: I think there would be a dependency on whether the center of the circle is in the north or south hemisphere. I am busy this morning but I hope to be able to spend some time on this later today. > Improve generation of circle plane > ----------------------------------- > > 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: LUCENE_7970.patch, LUCENE-7970.patch, > LUCENE-7970-proposed.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? -- This message was sent by Atlassian JIRA (v6.4.14#64029) --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscr...@lucene.apache.org For additional commands, e-mail: dev-h...@lucene.apache.org