Ignacio Vera created LUCENE-7906:

             Summary: 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


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 

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?



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