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https://issues.apache.org/jira/browse/LUCENE-8133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16334344#comment-16334344
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Karl Wright commented on LUCENE-8133:
-------------------------------------
One thing to note is the javadoc for createGeoPolygon():
{code}
/** Create a GeoPolygon using the specified points and holes, using order to
determine
* siding of the polygon. Much like ESRI, this method uses clockwise to
indicate the space
* on the same side of the shape as being inside, and counter-clockwise to
indicate the
* space on the opposite side as being inside.
* @param pointList is a list of the GeoPoints to build an arbitrary polygon
out of. If points go
* clockwise from a given pole, then that pole should be within the polygon.
If points go
* counter-clockwise, then that pole should be outside the polygon.
* @return a GeoPolygon corresponding to what was specified.
*/
{code}
In other words, the behavior is quite different depending on the order the
points come in. The code considers the order to determine the "pole" -- that
is, the point that's actually within the polygon. Here are the points in the
test case:
{code}
+ points.add(new GeoPoint(PlanetModel.SPHERE,
Geo3DUtil.fromDegrees(-23.434456), Geo3DUtil.fromDegrees(14.459204)));
+ points.add(new GeoPoint(PlanetModel.SPHERE, Geo3DUtil.fromDegrees(
-23.43394), Geo3DUtil.fromDegrees(14.459206)));
+ points.add(new GeoPoint(PlanetModel.SPHERE,
Geo3DUtil.fromDegrees(-23.434196), Geo3DUtil.fromDegrees(14.458647)));
+ points.add(new GeoPoint(PlanetModel.SPHERE,
Geo3DUtil.fromDegrees(-23.434452), Geo3DUtil.fromDegrees(14.458646)));
{code}
My guess is that the "pole" chosen for this ordering is in the part of the
sphere that is "everything but" the polygon that was intended. That *should*
work nevertheless.
> Small polygon fails with misleading error: Convex polygon has a side that is
> more than 180 degrees
> ---------------------------------------------------------------------------------------------------
>
> Key: LUCENE-8133
> URL: https://issues.apache.org/jira/browse/LUCENE-8133
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/spatial3d
> Reporter: Ignacio Vera
> Assignee: Karl Wright
> Priority: Major
> Attachments: LUCENE-8133.patch, image-2018-01-22-12-52-21-656.png,
> image-2018-01-22-12-55-17-096.png
>
>
> Hi [~karl wright],
> I am trying to create a polygon that is valid but I am getting an error which
> is probably incorrect. I think it is a problem with precision.
> I will attach a test.
>
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