[jira] [Commented] (LUCENE-7906) Spatial relationship between Geoshapes

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[jira] [Commented] (LUCENE-7906) Spatial relationship between Geoshapes

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    [ https://issues.apache.org/jira/browse/LUCENE-7906?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16089707#comment-16089707 ]

Karl Wright commented on LUCENE-7906:
-------------------------------------

Multiple edge points must get returned when there are disconnected sections of the shape, when projected onto the world surface.  This happens in a couple of situations, most notably for XYZSolids, which can slice straight through a world and manifest themselves as multiple actual areas.

There is also no *harm* in returning more than one point, even for a connected area, except for performance loss.


> Spatial relationship between Geoshapes
> --------------------------------------
>
>                 Key: LUCENE-7906
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7906
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: modules/spatial3d
>            Reporter: Ignacio Vera
>            Assignee: Karl Wright
>
> Hi,
> Working with geosahpes and trying to resolve spatial relationships between them I came accross a big limitation when trying to solve the relationship between two geopolygons. This object does not expose the internal structure. In particular at some point, it is necessary to check if one polygon intersects the edges of the other polygon which currently is not possible as edges are not exposed.
> To be able to perform such operation it can be several options. The ones I can think of are:
> 1) Expose the edges of the polygon ( and probably the notable points for the edges) adding getters in the GeoPolygon interface. Easy to implement and leave users the responsability of coding the spatial relationship.
> 2) Extends GeoPolygon interface to extends geoarea and leave the object make the spatial relationship.
> 3) Extends GeoShape  interface so all shapes can infer the spatial relationship with other GeoShapes.
> I might be bias as my interest is in 2d Shapes in the unit sphere and there might be some cases which what I propose cannot be implemented or are againts the aim of the library.
> What do you think?
> Cheers,
> Ignacio



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